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</div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2501.05820">arXiv:2501.05820</a> <span> [<a href="https://arxiv.org/pdf/2501.05820">pdf</a>, <a href="https://arxiv.org/format/2501.05820">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> User Selection in Near-Field Gigantic MIMO Systems with Modular Arrays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Gonz%C3%A1lez-Coma%2C+J+P">Jos茅 P. Gonz谩lez-Coma</a>, <a href="/search/eess?searchtype=author&query=Fern%C3%A1ndez%2C+S">Santiago Fern谩ndez</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2501.05820v1-abstract-short" style="display: inline;"> Modular Arrays (MAs) are a promising architecture to enable multi-user communications in next-generation multiple-input multiple-output (MIMO) systems based on extra-large (XL) or gigantic MIMO (gMIMO) deployments, trading off an improved spatial resolution with characteristic interference patterns associated to grating lobes. In this work, we analyze whether MAs can outperform conventional colloc… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.05820v1-abstract-full').style.display = 'inline'; document.getElementById('2501.05820v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2501.05820v1-abstract-full" style="display: none;"> Modular Arrays (MAs) are a promising architecture to enable multi-user communications in next-generation multiple-input multiple-output (MIMO) systems based on extra-large (XL) or gigantic MIMO (gMIMO) deployments, trading off an improved spatial resolution with characteristic interference patterns associated to grating lobes. In this work, we analyze whether MAs can outperform conventional collocated deployments, in terms of achievable sum-rate and served users in a multi-user downlink set-up. First, we provide a rigorous analytical characterization of the inter-user interference for modular gMIMO systems operating in the near field. Then, we leverage these results to optimize the user selection and precoding mechanisms, designing two algorithms that largely outperform existing alternatives in the literature, with different algorithmic complexities. Results show that the proposed algorithms yield over 70% improvements in achievable sum-spectral efficiencies compared to the state of the art. We also illustrate how MAs allow to serve a larger number of users thanks to their improved spatial resolution, compared to the collocated counterpart. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2501.05820v1-abstract-full').style.display = 'none'; document.getElementById('2501.05820v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 10 January, 2025; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2025. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2412.03274">arXiv:2412.03274</a> <span> [<a href="https://arxiv.org/pdf/2412.03274">pdf</a>, <a href="https://arxiv.org/format/2412.03274">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> How Should One Fit Channel Measurements to Fading Distributions for Performance Analysis? </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Fern%C3%A1ndez%2C+S">Santiago Fern谩ndez</a>, <a href="/search/eess?searchtype=author&query=Vega-S%C3%A1nchez%2C+J+D">Jos茅 David Vega-S谩nchez</a>, <a href="/search/eess?searchtype=author&query=Galeote-Cazorla%2C+J+E">Juan E. Galeote-Cazorla</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2412.03274v1-abstract-short" style="display: inline;"> Accurate channel modeling plays a pivotal role in optimizing communication systems, especially as new frequency bands come into play in next-generation networks. In this regard, fitting field measurements to stochastic models is crucial for capturing the key propagation features and to map these to achievable system performances. In this work, we shed light onto what's the most appropriate alterna… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.03274v1-abstract-full').style.display = 'inline'; document.getElementById('2412.03274v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2412.03274v1-abstract-full" style="display: none;"> Accurate channel modeling plays a pivotal role in optimizing communication systems, especially as new frequency bands come into play in next-generation networks. In this regard, fitting field measurements to stochastic models is crucial for capturing the key propagation features and to map these to achievable system performances. In this work, we shed light onto what's the most appropriate alternative for channel fitting, when the ultimate goal is performance analysis. Results show that average-error metrics should be used with caution, since they can largely fail to predict outage probability measures. We show that supremum-error fitting metrics with tail awareness are more robust to estimate both ergodic and outage performance measures, even when they yield a larger average-error fitting. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2412.03274v1-abstract-full').style.display = 'none'; document.getElementById('2412.03274v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2411.11453">arXiv:2411.11453</a> <span> [<a href="https://arxiv.org/pdf/2411.11453">pdf</a>, <a href="https://arxiv.org/ps/2411.11453">ps</a>, <a href="https://arxiv.org/format/2411.11453">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Fluid Antenna-Aided Rate-Splitting Multiple Access </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Hanzo%2C+L">Lajos Hanzo</a>, <a href="/search/eess?searchtype=author&query=Chae%2C+C">Chan-Byoung Chae</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2411.11453v1-abstract-short" style="display: inline;"> This letter considers a fluid antenna system (FAS)-aided rate-splitting multiple access (RSMA) approach for downlink transmission. In particular, a base station (BS) equipped with a single traditional antenna system (TAS) uses RSMA signaling to send information to several mobile users (MUs) each equipped with FAS. To understand the achievable performance, we first present the distribution of the e… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.11453v1-abstract-full').style.display = 'inline'; document.getElementById('2411.11453v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2411.11453v1-abstract-full" style="display: none;"> This letter considers a fluid antenna system (FAS)-aided rate-splitting multiple access (RSMA) approach for downlink transmission. In particular, a base station (BS) equipped with a single traditional antenna system (TAS) uses RSMA signaling to send information to several mobile users (MUs) each equipped with FAS. To understand the achievable performance, we first present the distribution of the equivalent channel gain based on the joint multivariate t-distribution and then derive a compact analytical expression for the outage probability (OP). Moreover, we obtain the asymptotic OP in the high signal-to-noise ratio (SNR) regime. Numerical results show that combining FAS with RSMA significantly outperforms TAS and conventional multiple access schemes, such as non-orthogonal multiple access (NOMA), in terms of OP. The results also indicate that FAS can be the tool that greatly improves the practicality of RSMA. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2411.11453v1-abstract-full').style.display = 'none'; document.getElementById('2411.11453v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> November 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2409.15164">arXiv:2409.15164</a> <span> [<a href="https://arxiv.org/pdf/2409.15164">pdf</a>, <a href="https://arxiv.org/ps/2409.15164">ps</a>, <a href="https://arxiv.org/format/2409.15164">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Reliable and Secure Communications Through Compact Ultra-Massive Antenna Arrays </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Vega-S%C3%A1nchez%2C+J+D">Jos茅 David Vega-S谩nchez</a>, <a href="/search/eess?searchtype=author&query=Mora%2C+H+R+C">Henry Ramiro Carvajal Mora</a>, <a href="/search/eess?searchtype=author&query=Garz%C3%B3n%2C+N+V+O">Nathaly Ver贸nica Orozco Garz贸n</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. J. L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2409.15164v1-abstract-short" style="display: inline;"> Compact Ultramassive Antenna Array (CUMA) is a pioneering paradigm that leverages the flexibility of the Fluid Antenna System (FAS) to enable a simple multiple access scheme for massive connectivity without the need for precoding, power control at the base station or interference mitigation in each user's equipment. In order to overcome the mathematical intricacy required to analyze their performa… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15164v1-abstract-full').style.display = 'inline'; document.getElementById('2409.15164v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2409.15164v1-abstract-full" style="display: none;"> Compact Ultramassive Antenna Array (CUMA) is a pioneering paradigm that leverages the flexibility of the Fluid Antenna System (FAS) to enable a simple multiple access scheme for massive connectivity without the need for precoding, power control at the base station or interference mitigation in each user's equipment. In order to overcome the mathematical intricacy required to analyze their performance, we use an asymptotic matching approach to relax such complexity with a remarkable accuracy. First, we analyze the performance of the CUMA network in terms of the outage probability (OP) and the ergodic rate (ER), deriving simple and highly accurate closed-form approximations to the channel statistics. Then, we evaluate the potential of the CUMA scheme to provide secure multi-user communications from a physical layer security perspective. Leveraging a tight approximation to the signal-to-interference-ratio (SIR) distribution, we derive closed-form expressions for the secrecy outage probability (SOP). We observe that the baseline CUMA (without side information processing) exhibits limited performance when eavesdroppers are equipped with a CUMA of the same type. To improve their secure performance, we suggest that a simple imperfect interference cancellation mechanism at the legitimate receiver may substantially increase the secrecy performance. Monte Carlo simulations validate our approximations and demonstrate their accuracy under different CUMA-based scenarios. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2409.15164v1-abstract-full').style.display = 'none'; document.getElementById('2409.15164v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.14969">arXiv:2408.14969</a> <span> [<a href="https://arxiv.org/pdf/2408.14969">pdf</a>, <a href="https://arxiv.org/format/2408.14969">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Secrecy Performance Analysis of RIS-Aided Fluid Antenna Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Kaveh%2C+M">Masoud Kaveh</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=New%2C+W+K">Wee Kiat New</a>, <a href="/search/eess?searchtype=author&query=Xu%2C+H">Hao Xu</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.14969v1-abstract-short" style="display: inline;"> This paper examines the impact of emerging fluid antenna systems (FAS) on reconfigurable intelligent surface (RIS)-aided secure communications. Specifically, we consider a classic wiretap channel, where a fixed-antenna transmitter sends confidential information to an FAS-equipped legitimate user with the help of an RIS, while an FAS-equipped eavesdropper attempts to decode the message. To evaluate… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.14969v1-abstract-full').style.display = 'inline'; document.getElementById('2408.14969v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.14969v1-abstract-full" style="display: none;"> This paper examines the impact of emerging fluid antenna systems (FAS) on reconfigurable intelligent surface (RIS)-aided secure communications. Specifically, we consider a classic wiretap channel, where a fixed-antenna transmitter sends confidential information to an FAS-equipped legitimate user with the help of an RIS, while an FAS-equipped eavesdropper attempts to decode the message. To evaluate the proposed wireless scenario, we first introduce the cumulative distribution function (CDF) and probability density function (PDF) of the signal-to-noise ratio (SNR) at each node, using the central limit theorem and the Gaussian copula function. We then derive a compact analytical expression for the secrecy outage probability (SOP). Our numerical results reveal how the incorporation of FAS and RIS can significantly enhance the performance of secure communications. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.14969v1-abstract-full').style.display = 'none'; document.getElementById('2408.14969v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 27 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2408.04724">arXiv:2408.04724</a> <span> [<a href="https://arxiv.org/pdf/2408.04724">pdf</a>, <a href="https://arxiv.org/format/2408.04724">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Performance Analysis of FAS-Aided NOMA-ISAC: A Backscattering Scenario </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Shin%2C+H">Hyundong Shin</a>, <a href="/search/eess?searchtype=author&query=Hanzo%2C+L">Lajos Hanzo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2408.04724v1-abstract-short" style="display: inline;"> This paper investigates a two-user downlink system for integrated sensing and communication (ISAC) in which the two users deploy a fluid antenna system (FAS) and adopt the nonorthogonal multiple access (NOMA) strategy. Specifically, the integrated sensing and backscatter communication (ISABC) model is considered, where a dual-functional base station (BS) serves to communicate the two users and sen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.04724v1-abstract-full').style.display = 'inline'; document.getElementById('2408.04724v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2408.04724v1-abstract-full" style="display: none;"> This paper investigates a two-user downlink system for integrated sensing and communication (ISAC) in which the two users deploy a fluid antenna system (FAS) and adopt the nonorthogonal multiple access (NOMA) strategy. Specifically, the integrated sensing and backscatter communication (ISABC) model is considered, where a dual-functional base station (BS) serves to communicate the two users and sense a tag's surrounding. In contrast to conventional ISAC, the backscattering tag reflects the signals transmitted by the BS to the NOMA users and enhances their communication performance. Furthermore, the BS extracts environmental information from the same backscatter signal in the sensing stage. Firstly, we derive closed-form expressions for both the cumulative distribution function (CDF) and probability density function (PDF) of the equivalent channel at the users utilizing the moment matching method and the Gaussian copula. Then in the communication stage, we obtain closed-form expressions for both the outage probability and for the corresponding asymptotic expressions in the high signal-to-noise ratio (SNR) regime. Moreover, using numerical integration techniques such as the Gauss-Laguerre quadrature (GLQ), we have series-form expressions for the user ergodic communication rates (ECRs). In addition, we get a closed-form expression for the ergodic sensing rate (ESR) using the Cramer-Rao lower bound (CRLB). Finally, the accuracy of our analytical results is validated numerically, and we confirm the superiority of employing FAS over traditional fixed-position antenna systems in both ISAC and ISABC. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2408.04724v1-abstract-full').style.display = 'none'; document.getElementById('2408.04724v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 August, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2405.09336">arXiv:2405.09336</a> <span> [<a href="https://arxiv.org/pdf/2405.09336">pdf</a>, <a href="https://arxiv.org/format/2405.09336">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Analytical Characterization of the Operational Diversity Order in Fading Channels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Fern%C3%A1ndez%2C+S">Santiago Fern谩ndez</a>, <a href="/search/eess?searchtype=author&query=Bail%C3%B3n-Mart%C3%ADnez%2C+J+A">J. Alfonso Bail贸n-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Galeote-Cazorla%2C+J+E">Juan E. Galeote-Cazorla</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2405.09336v3-abstract-short" style="display: inline;"> We introduce and characterize the operational diversity order (ODO) in fading channels, as a proxy to the classical notion of diversity order at any arbitrary operational signal-to-noise ratio (SNR). Thanks to this definition, relevant insights are brought up in a number of cases: (i) We quantify that in dominant line-of-sight scenarios an increased diversity order is attainable compared to that a… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.09336v3-abstract-full').style.display = 'inline'; document.getElementById('2405.09336v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2405.09336v3-abstract-full" style="display: none;"> We introduce and characterize the operational diversity order (ODO) in fading channels, as a proxy to the classical notion of diversity order at any arbitrary operational signal-to-noise ratio (SNR). Thanks to this definition, relevant insights are brought up in a number of cases: (i) We quantify that in dominant line-of-sight scenarios an increased diversity order is attainable compared to that achieved asymptotically, even in the single-antenna case; (ii) this effect is attenuated, but still visible, in the presence of an additional dominant specular component; (iii) the decay slope in Rayleigh product channels increases very slowly, never fully achieving unitary slope for a finite SNR. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2405.09336v3-abstract-full').style.display = 'none'; document.getElementById('2405.09336v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 November, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 15 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2402.05722">arXiv:2402.05722</a> <span> [<a href="https://arxiv.org/pdf/2402.05722">pdf</a>, <a href="https://arxiv.org/format/2402.05722">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Physical Layer Security over Fluid Antenna Systems: Secrecy Performance Analysis </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=New%2C+W+K">Wee Kiat New</a>, <a href="/search/eess?searchtype=author&query=Xu%2C+H">Hao Xu</a>, <a href="/search/eess?searchtype=author&query=Chae%2C+C">Chan-Byoung Chae</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2402.05722v2-abstract-short" style="display: inline;"> This paper investigates the performance of physical layer security (PLS) in fluid antenna-aided communication systems under arbitrary correlated fading channels. In particular, it is considered that a single fixed-antenna transmitter aims to send confidential information to a legitimate receiver equipped with a planar fluid antenna system (FAS), while an eavesdropper, also taking advantage of a pl… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05722v2-abstract-full').style.display = 'inline'; document.getElementById('2402.05722v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2402.05722v2-abstract-full" style="display: none;"> This paper investigates the performance of physical layer security (PLS) in fluid antenna-aided communication systems under arbitrary correlated fading channels. In particular, it is considered that a single fixed-antenna transmitter aims to send confidential information to a legitimate receiver equipped with a planar fluid antenna system (FAS), while an eavesdropper, also taking advantage of a planar FAS, attempts to decode the desired message. For this scenario, we first present analytical expressions of the equivalent channel distributions at the legitimate user and eavesdropper by using copula, so that the obtained analytical results are valid for any arbitrarily correlated fading distributions. Then, with the help of Gauss-Laguerre quadrature, we derive compact analytical expressions for the average secrecy capacity (ASC), the secrecy outage probability (SOP), and the secrecy energy efficiency (SEE) for the FAS wiretap channel. Moreover, for exemplary purposes, we also obtain the compact expression of ASC, SOP, and SEE by utilizing the Gaussian copula under correlated Rayleigh fading channels as a special case. Eventually, numerical results indicate that applying the fluid antenna with only one activated port to PLS can guarantee more secure and reliable transmission, when compared to traditional antenna systems (TAS) exploiting maximal ratio combining (MRC) and antenna selection (AS) under selection combining (SC). <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2402.05722v2-abstract-full').style.display = 'none'; document.getElementById('2402.05722v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 17 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 8 February, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07604">arXiv:2309.07604</a> <span> [<a href="https://arxiv.org/pdf/2309.07604">pdf</a>, <a href="https://arxiv.org/format/2309.07604">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Fluid Antenna-Assisted Dirty Multiple Access Channels over Composite Fading </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Chae%2C+C">Chan-Byoung Chae</a>, <a href="/search/eess?searchtype=author&query=Tong%2C+K">Kin-Fai Tong</a>, <a href="/search/eess?searchtype=author&query=Zhang%2C+Y">Yangyang Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07604v1-abstract-short" style="display: inline;"> This letter investigates the application of the emerging fluid antenna (FA) technology in multiuser communication systems when side information (SI) is available at the transmitters. In particular, we consider a K-user dirty multiple access channel (DMAC) with non-causally known SI at the transmitters, where K users send independent messages to a common receiver with a FA capable of changing its l… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07604v1-abstract-full').style.display = 'inline'; document.getElementById('2309.07604v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07604v1-abstract-full" style="display: none;"> This letter investigates the application of the emerging fluid antenna (FA) technology in multiuser communication systems when side information (SI) is available at the transmitters. In particular, we consider a K-user dirty multiple access channel (DMAC) with non-causally known SI at the transmitters, where K users send independent messages to a common receiver with a FA capable of changing its location depending on the channel condition. By connecting Jakes' model to copula theory through Spearman's 蟻 rank correlation coefficient, we accurately describe the spatial correlation between the FA channels, and derive a closed-form expression for the outage probability (OP) under Fisher-Snedecor F fading. Numerical results illustrate how considering FA can improve the performance of multiuser communication systems in terms of the OP and also support a large number of users using only one FA at the common receiver in a few wavelengths of space. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07604v1-abstract-full').style.display = 'none'; document.getElementById('2309.07604v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2309.07506">arXiv:2309.07506</a> <span> [<a href="https://arxiv.org/pdf/2309.07506">pdf</a>, <a href="https://arxiv.org/format/2309.07506">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> A Gaussian Copula Approach to the Performance Analysis of Fluid Antenna Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Chae%2C+C">Chan-Byoung Chae</a>, <a href="/search/eess?searchtype=author&query=Tong%2C+K">Kin-Fai Tong</a>, <a href="/search/eess?searchtype=author&query=Zhang%2C+Y">Yangyang Zhang</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2309.07506v2-abstract-short" style="display: inline;"> This paper investigates the performance of a single-user fluid antenna system (FAS), by exploiting a class of elliptical copulas to describe the dependence structure amongst the fluid antenna positions (ports). By expressing the well-known Jakes' model in terms of the Gaussian copula, we consider two cases: (i) the general case, i.e., any arbitrary correlated fading distribution; and (ii) the spec… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07506v2-abstract-full').style.display = 'inline'; document.getElementById('2309.07506v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2309.07506v2-abstract-full" style="display: none;"> This paper investigates the performance of a single-user fluid antenna system (FAS), by exploiting a class of elliptical copulas to describe the dependence structure amongst the fluid antenna positions (ports). By expressing the well-known Jakes' model in terms of the Gaussian copula, we consider two cases: (i) the general case, i.e., any arbitrary correlated fading distribution; and (ii) the specific case, i.e., correlated Nakagami-$m$ fading. For both scenarios, we first derive analytical expressions for the cumulative distribution function (CDF) and probability density function (PDF) of the equivalent channel in terms of multivariate normal distribution. Then we obtain the outage probability (OP) and the delay outage rate (DOR) to analyze the performance of FAS. By employing the popular rank correlation coefficients such as Spearman's $蟻$ and Kendall's $蟿$ , we measure the degree of dependency in correlated arbitrary fading channels and illustrate how the Gaussian copula can be accurately connected to Jakes' model in FAS. Our numerical results demonstrate that increasing the size of FAS provides lower OP and DOR, but the system performance saturates as the number of antenna ports increases. In addition, our results indicate that FAS provides better performance compared to conventional single-fixed antenna systems even when the size of fluid antenna is small. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2309.07506v2-abstract-full').style.display = 'none'; document.getElementById('2309.07506v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 3 September, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 14 September, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2308.06189">arXiv:2308.06189</a> <span> [<a href="https://arxiv.org/pdf/2308.06189">pdf</a>, <a href="https://arxiv.org/ps/2308.06189">ps</a>, <a href="https://arxiv.org/format/2308.06189">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Companding and Predistortion Techniques for Improved Efficiency and Performance in SWIPT </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Fern%C3%A1ndez%2C+S">Santiago Fern谩ndez</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Gregorio%2C+F+H">Fernando H. Gregorio</a>, <a href="/search/eess?searchtype=author&query=Cousseau%2C+J">Juan Cousseau</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2308.06189v5-abstract-short" style="display: inline;"> In this work, we analyze how the use of companding techniques, together with digital predistortion (DPD), can be leveraged to improve system efficiency and performance in simultaneous wireless information and power transfer (SWIPT) systems based on power splitting. By taking advantage of the benefits of each of these well-known techniques to mitigate non-linear effects due to power amplifier (PA)… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06189v5-abstract-full').style.display = 'inline'; document.getElementById('2308.06189v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2308.06189v5-abstract-full" style="display: none;"> In this work, we analyze how the use of companding techniques, together with digital predistortion (DPD), can be leveraged to improve system efficiency and performance in simultaneous wireless information and power transfer (SWIPT) systems based on power splitting. By taking advantage of the benefits of each of these well-known techniques to mitigate non-linear effects due to power amplifier (PA) and energy harvesting (EH) operation, we illustrate how DPD and companding can be effectively combined to improve the EH efficiency while keeping unalterable the information transfer performance. We establish design criteria that allow the PA to operate in a higher efficiency region so that the reduction in peak-to-average power ratio over the transmitted signal is translated into an increase in the average radiated power and EH efficiency. The performance of DPD and companding techniques is evaluated in a number of scenarios, showing that a combination of both techniques allows to significantly increase the power transfer efficiency in SWIPT systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2308.06189v5-abstract-full').style.display = 'none'; document.getElementById('2308.06189v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 11 August, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2307.15467">arXiv:2307.15467</a> <span> [<a href="https://arxiv.org/pdf/2307.15467">pdf</a>, <a href="https://arxiv.org/ps/2307.15467">ps</a>, <a href="https://arxiv.org/format/2307.15467">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TWC.2024.3509738">10.1109/TWC.2024.3509738 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Empirical Validation of a Class of Ray-Based Fading Models </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Galeote-Cazorla%2C+J+E">Juan E. Galeote-Cazorla</a>, <a href="/search/eess?searchtype=author&query=Ram%C3%ADrez-Arroyo%2C+A">Alejandro Ram铆rez-Arroyo</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Valenzuela-Vald%C3%A9s%2C+J+F">Juan F. Valenzuela-Vald茅s</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2307.15467v4-abstract-short" style="display: inline;"> As new wireless standards are developed, the use of higher operation frequencies comes in hand with new use cases and propagation effects that differ from the well-established state of the art. Numerous stochastic fading models have recently emerged under the umbrella of generalized fading conditions to provide a fine-grain characterization of propagation channels in the mmWave and sub-THz bands.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15467v4-abstract-full').style.display = 'inline'; document.getElementById('2307.15467v4-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2307.15467v4-abstract-full" style="display: none;"> As new wireless standards are developed, the use of higher operation frequencies comes in hand with new use cases and propagation effects that differ from the well-established state of the art. Numerous stochastic fading models have recently emerged under the umbrella of generalized fading conditions to provide a fine-grain characterization of propagation channels in the mmWave and sub-THz bands. For the first time in literature, this work carries out an experimental validation of a class of such ray-based models in a wide range of propagation conditions (anechoic, reverberation and indoor scenarios) at mmWave bands. These models allow to characterize the communication channel with a reduced number of physically interpretable parameters. In specific, we show that the independent fluctuating two-ray (IFTR) model has good capabilities to recreate rather dissimilar environments with high accuracy and only four parameters. We also put forth that the key limitations of the IFTR model arise in the presence of reduced diffuse propagation, and also due to a limited phase variability for the dominant specular components. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2307.15467v4-abstract-full').style.display = 'none'; document.getElementById('2307.15467v4-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 December, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 28 July, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">14 pages, 13 figures, in IEEE Transactions on Wireless Communications, 2024</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2306.00404">arXiv:2306.00404</a> <span> [<a href="https://arxiv.org/pdf/2306.00404">pdf</a>, <a href="https://arxiv.org/format/2306.00404">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Analytical Characterization of Coverage Regions for STAR-RIS-aided NOMA/OMA Communication Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2306.00404v1-abstract-short" style="display: inline;"> We provide an analytical characterization of the coverage region of simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-aided two-user downlink communication systems. The cases of orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) are considered, under the energy-splitting (ES) protocol. Results confirm that the use of STAR-RISs is benef… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00404v1-abstract-full').style.display = 'inline'; document.getElementById('2306.00404v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2306.00404v1-abstract-full" style="display: none;"> We provide an analytical characterization of the coverage region of simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS)-aided two-user downlink communication systems. The cases of orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) are considered, under the energy-splitting (ES) protocol. Results confirm that the use of STAR-RISs is beneficial to extend the coverage region, and that the use of NOMA provides a better performance compared to the OMA counterpart. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2306.00404v1-abstract-full').style.display = 'none'; document.getElementById('2306.00404v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 1 June, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> June 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.09553">arXiv:2305.09553</a> <span> [<a href="https://arxiv.org/pdf/2305.09553">pdf</a>, <a href="https://arxiv.org/format/2305.09553">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Copula-based Performance Analysis for Fluid Antenna Systems under Arbitrary Fading Channels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ghadi%2C+F+R">Farshad Rostami Ghadi</a>, <a href="/search/eess?searchtype=author&query=Wong%2C+K">Kai-Kit Wong</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Tong%2C+K">Kin-Fai Tong</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.09553v1-abstract-short" style="display: inline;"> In this letter, we study the performance of a single-user fluid antenna system (FAS) under arbitrary fading distributions, in which the fading channel coefficients over the ports are correlated. We adopt copula theory to model the structure of dependency between fading coefficients. Specifically, we first derive an exact closed-from expression for the outage probability in the most general case, i… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09553v1-abstract-full').style.display = 'inline'; document.getElementById('2305.09553v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.09553v1-abstract-full" style="display: none;"> In this letter, we study the performance of a single-user fluid antenna system (FAS) under arbitrary fading distributions, in which the fading channel coefficients over the ports are correlated. We adopt copula theory to model the structure of dependency between fading coefficients. Specifically, we first derive an exact closed-from expression for the outage probability in the most general case, i.e., for any arbitrary choice of fading distribution and copula. Afterwards, for an important specific case, we analyze the performance of the outage probability under correlated Nakagami-$m$ fading channels by exploiting popular Archimedean copulas, namely, Frank, Clayton, and Gumbel. The results demonstrate that FAS outperforms the conventional single fixed-antenna system in terms of the outage probability. We also see that the spatial correlation dependency structure for the FAS is a key factor to determine its performance, which is natively captured through the choice of copula. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.09553v1-abstract-full').style.display = 'none'; document.getElementById('2305.09553v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2305.05342">arXiv:2305.05342</a> <span> [<a href="https://arxiv.org/pdf/2305.05342">pdf</a>, <a href="https://arxiv.org/format/2305.05342">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> The Multi-cluster Two-Wave Fading Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Olyaee%2C+M">Maryam Olyaee</a>, <a href="/search/eess?searchtype=author&query=Pena-Martin%2C+J+P">Juan P. Pena-Martin</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. J. Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2305.05342v2-abstract-short" style="display: inline;"> We introduce and characterize the Multi-cluster Two-Wave (MTW) fading model, which generalizes \textit{both} the Durgin's Two-Wave with Diffuse Power (TWDP) and the $魏$-$渭$ models under a common umbrella. The MTW model consists of an arbitrary number of clusters of waves each of which may include one or two dominant (specular) components. The chief probability functions of the MTW fading model are… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05342v2-abstract-full').style.display = 'inline'; document.getElementById('2305.05342v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.05342v2-abstract-full" style="display: none;"> We introduce and characterize the Multi-cluster Two-Wave (MTW) fading model, which generalizes \textit{both} the Durgin's Two-Wave with Diffuse Power (TWDP) and the $魏$-$渭$ models under a common umbrella. The MTW model consists of an arbitrary number of clusters of waves each of which may include one or two dominant (specular) components. The chief probability functions of the MTW fading model are obtained, including the probability density function, the cumulative distribution function and the generalized moment-generating function. \textcolor{black}{The proposed model is empirically validated using channel measurements in the sub-THz band and} a number of applications are exemplified, including the outage probability in noise-limited and interference-limited scenarios and the energy detection probability. %Exact expressions for the outage capacity are also obtained. A composite Inverse Gamma (IG)/MTW model is also investigated, thus extending the proposed propagation model to include shadowing. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.05342v2-abstract-full').style.display = 'none'; document.getElementById('2305.05342v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 9 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.13180">arXiv:2302.13180</a> <span> [<a href="https://arxiv.org/pdf/2302.13180">pdf</a>, <a href="https://arxiv.org/format/2302.13180">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> The Second Order Scattering Fading Model with Fluctuating Line-of-Sight </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Lopez-Fernandez%2C+J">Jesus Lopez-Fernandez</a>, <a href="/search/eess?searchtype=author&query=Anaya-Lopez%2C+G+J">Gonzalo J. Anaya-Lopez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.13180v1-abstract-short" style="display: inline;"> We present a generalization of the notoriously unwieldy second-order scattering fading model, which is helpful to alleviate its mathematical complexity while providing an additional degree of freedom. This is accomplished by allowing its dominant specular component associated to line-of-sight propagation to randomly fluctuate. The statistical characterization of the newly proposed model is carried… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.13180v1-abstract-full').style.display = 'inline'; document.getElementById('2302.13180v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.13180v1-abstract-full" style="display: none;"> We present a generalization of the notoriously unwieldy second-order scattering fading model, which is helpful to alleviate its mathematical complexity while providing an additional degree of freedom. This is accomplished by allowing its dominant specular component associated to line-of-sight propagation to randomly fluctuate. The statistical characterization of the newly proposed model is carried out, providing closed-form expressions for its probability and cumulative distribution functions, as well as for its generalized Laplace-domain statistics and raw moments. We exemplify how performance analysis can be done in this scenario, and discuss the role of the fading model parameters on system performance. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.13180v1-abstract-full').style.display = 'none'; document.getElementById('2302.13180v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2302.13178">arXiv:2302.13178</a> <span> [<a href="https://arxiv.org/pdf/2302.13178">pdf</a>, <a href="https://arxiv.org/format/2302.13178">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Joint User Scheduling and Precoding for XL-MIMO Systems with Imperfect CSI </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Gonzalez-Coma%2C+J+P">Jose P. Gonzalez-Coma</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Castedo%2C+L">Luis Castedo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2302.13178v1-abstract-short" style="display: inline;"> We propose an algorithm for joint precoding and user selection in multiple-input multiple-output systems with extremely-large aperture arrays, assuming realistic channel conditions and imperfect channel estimates. The use of long-term channel state information (CSI) for user scheduling, and a proper selection of the set of users for which CSI is updated allow for obtaining an improved achievable s… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.13178v1-abstract-full').style.display = 'inline'; document.getElementById('2302.13178v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2302.13178v1-abstract-full" style="display: none;"> We propose an algorithm for joint precoding and user selection in multiple-input multiple-output systems with extremely-large aperture arrays, assuming realistic channel conditions and imperfect channel estimates. The use of long-term channel state information (CSI) for user scheduling, and a proper selection of the set of users for which CSI is updated allow for obtaining an improved achievable sum spectral efficiency. We also confirm that the effect of imperfect CSI in the precoding vector design and the cost of training must be taken into consideration for realistic performance prediction. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2302.13178v1-abstract-full').style.display = 'none'; document.getElementById('2302.13178v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 February, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.11335">arXiv:2205.11335</a> <span> [<a href="https://arxiv.org/pdf/2205.11335">pdf</a>, <a href="https://arxiv.org/format/2205.11335">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Leakage Subspace Precoding and Scheduling for Physical Layer Security in Multi-User XL-MIMO Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Anaya-Lopez%2C+G+J">Gonzalo J. Anaya-Lopez</a>, <a href="/search/eess?searchtype=author&query=Gonzalez-Coma%2C+J+P">Jose P. Gonzalez-Coma</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.11335v2-abstract-short" style="display: inline;"> We investigate the achievable secrecy sum-rate in a multi-user XL-MIMO system, on which user distances to the base station become comparable to the antenna array dimensions. We show that the consideration of spherical-wavefront propagation inherent to these set-ups is beneficial for physical-layer security, as it provides immunity against eavesdroppers located in similar angular directions that wo… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.11335v2-abstract-full').style.display = 'inline'; document.getElementById('2205.11335v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.11335v2-abstract-full" style="display: none;"> We investigate the achievable secrecy sum-rate in a multi-user XL-MIMO system, on which user distances to the base station become comparable to the antenna array dimensions. We show that the consideration of spherical-wavefront propagation inherent to these set-ups is beneficial for physical-layer security, as it provides immunity against eavesdroppers located in similar angular directions that would otherwise prevent secure communication under classical planar-wavefront propagation. A leakage subspace precoding strategy is also proposed for joint secure precoding and user scheduling, which allows to improve the secrecy sum-rate compared to conventional zero-forcing based strategies, under different eavesdropper collusion strategies. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.11335v2-abstract-full').style.display = 'none'; document.getElementById('2205.11335v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 20 July, 2022; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 23 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages and 4 figures. This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.05604">arXiv:2205.05604</a> <span> [<a href="https://arxiv.org/pdf/2205.05604">pdf</a>, <a href="https://arxiv.org/format/2205.05604">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> The Fluctuating Two-Ray Fading Model with Independent Specular Components </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Olyaee%2C+M">Maryam Olyaee</a>, <a href="/search/eess?searchtype=author&query=Cort%C3%A9s%2C+J+A">Jos茅 A. Cort茅s</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Paris%2C+J+F">Jos茅 F. Paris</a>, <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.05604v1-abstract-short" style="display: inline;"> We introduce and characterize the independent fluctuating two-ray (IFTR) fading model, a class of fading models consisting of two specular components which fluctuate independently, plus a diffuse component modeled as a complex Gaussian random variable. The IFTR model complements the popular fluctuating two-ray (FTR) model, on which the specular components are fully correlated and fluctuate jointly… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05604v1-abstract-full').style.display = 'inline'; document.getElementById('2205.05604v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.05604v1-abstract-full" style="display: none;"> We introduce and characterize the independent fluctuating two-ray (IFTR) fading model, a class of fading models consisting of two specular components which fluctuate independently, plus a diffuse component modeled as a complex Gaussian random variable. The IFTR model complements the popular fluctuating two-ray (FTR) model, on which the specular components are fully correlated and fluctuate jointly. The chief probability functions of the received SNR in IFTR fading, including the PDF, CDF and MGF, are expressed in closed-form, having a functional form similar to other state-of-the-art fading models. Then, the IFTR model is empirically validated using multiple channels measured in rather diverse scenarios, including line of sight (LOS) millimeter-wave, land mobile satellite (LMS) and underwater acoustic communication (UAC), showing a better fit than the original FTR model and other models previously used in these environments. Additionally, the performance of wireless communication systems operating under IFTR fading is evaluated in closed-form in two scenarios: (i) exact and asymptotic bit error rate for a family of coherent modulations; and (ii) exact and asymptotic outage probability. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.05604v1-abstract-full').style.display = 'none'; document.getElementById('2205.05604v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 8 figures. arXiv admin note: text overlap with arXiv:1611.05063</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2205.04578">arXiv:2205.04578</a> <span> [<a href="https://arxiv.org/pdf/2205.04578">pdf</a>, <a href="https://arxiv.org/ps/2205.04578">ps</a>, <a href="https://arxiv.org/format/2205.04578">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Composite IG/FTR Channel Performance in Wireless Communication Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Olyaee%2C+M">Maryam Olyaee</a>, <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Goldsmith%2C+A+J">Andrea J. Goldsmith</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2205.04578v1-abstract-short" style="display: inline;"> We present a composite wireless fading model encompassing multipath fading and shadowing based on fluctuating two-ray (FTR) fading and inverse gamma (IG) shadowing. We first determine an alternative framework for the statistical characterization and performance evaluation of the FTR fading model, which is based on the fact that the FTR fading distribution can be described as an underlying Rician S… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.04578v1-abstract-full').style.display = 'inline'; document.getElementById('2205.04578v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2205.04578v1-abstract-full" style="display: none;"> We present a composite wireless fading model encompassing multipath fading and shadowing based on fluctuating two-ray (FTR) fading and inverse gamma (IG) shadowing. We first determine an alternative framework for the statistical characterization and performance evaluation of the FTR fading model, which is based on the fact that the FTR fading distribution can be described as an underlying Rician Shadowed (RS) distribution with continuously varying parameter Kr (ratio of specular to diffuse components). We demonstrate that this new formulation permits to obtain a closed-form expression of the generalized moment generating function (GMGF) of the FTR model, from which the PDF and CDF of the composite IG/FTR model can be obtained in closed-form. The exact and asymptotic outage probability of the IG/FTR model are analyzed and verified by Monte Carlo simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2205.04578v1-abstract-full').style.display = 'none'; document.getElementById('2205.04578v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication. arXiv admin note: substantial text overlap with arXiv:2108.02990</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2203.13510">arXiv:2203.13510</a> <span> [<a href="https://arxiv.org/pdf/2203.13510">pdf</a>, <a href="https://arxiv.org/format/2203.13510">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Joint Distribution of Distance and Angles in Finite Wireless Networks </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Mart%C3%ADn-Vega%2C+F+J">Francisco J. Mart铆n-Vega</a>, <a href="/search/eess?searchtype=author&query=G%C3%B3mez%2C+G">Gerardo G贸mez</a>, <a href="/search/eess?searchtype=author&query=Morales-Jim%C3%A9nez%2C+D">David Morales-Jim茅nez</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Aguayo-Torres%2C+M+C">Mari Carmen Aguayo-Torres</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2203.13510v3-abstract-short" style="display: inline;"> Directional beamforming will play a paramount role in 5G and beyond networks in order to combat the higher path losses incurred at millimeter wave bands. Appropriate modeling and analysis of the angles and distances between transmitters and receivers in these networks are thus essential to understand performance and limiting factors. Most existing literature considers either infinite and uniform n… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13510v3-abstract-full').style.display = 'inline'; document.getElementById('2203.13510v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2203.13510v3-abstract-full" style="display: none;"> Directional beamforming will play a paramount role in 5G and beyond networks in order to combat the higher path losses incurred at millimeter wave bands. Appropriate modeling and analysis of the angles and distances between transmitters and receivers in these networks are thus essential to understand performance and limiting factors. Most existing literature considers either infinite and uniform networks, where nodes are drawn according to a Poisson point process, or finite networks with the reference receiver placed at the origin of a disk. Under either of these assumptions, the distance and azimuth angle between transmitter and receiver are independent, and the angle follows a uniform distribution between $0$ and $2蟺$. Here, we consider a more realistic case of finite networks where the reference node is placed at any arbitrary location. We obtain the joint distribution between the distance and azimuth angle and demonstrate that these random variables do exhibit certain correlation, which depends on the shape of the region and the location of the reference node. To conduct the analysis, we present a general mathematical framework which is specialized to exemplify the case of a rectangular region. We then also derive the statistics for the 3D case where, considering antenna heights, the joint distribution of distance, azimuth and zenith angles is obtained. Finally, we describe some immediate applications of the present work, including the analysis of directional beamforming, the design of analog codebooks and wireless routing algorithms. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2203.13510v3-abstract-full').style.display = 'none'; document.getElementById('2203.13510v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 18 May, 2023; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 25 March, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2022. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">16 pages, 10 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2108.02990">arXiv:2108.02990</a> <span> [<a href="https://arxiv.org/pdf/2108.02990">pdf</a>, <a href="https://arxiv.org/format/2108.02990">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Alternative Formulations for the Fluctuating Two-Ray Fading Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Olyaee%2C+M">Maryam Olyaee</a>, <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Goldsmith%2C+A+J">Andrea J. Goldsmith</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2108.02990v2-abstract-short" style="display: inline;"> We present two alternative formulations for the distribution of the fluctuating two-ray (FTR) fading model, which simplify its statistical characterization and subsequent use for performance evaluation. New expressions for the probability density function (PDF) and cumulative distribution function of the FTR model are obtained based on the observation that the FTR fading distribution is described,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.02990v2-abstract-full').style.display = 'inline'; document.getElementById('2108.02990v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2108.02990v2-abstract-full" style="display: none;"> We present two alternative formulations for the distribution of the fluctuating two-ray (FTR) fading model, which simplify its statistical characterization and subsequent use for performance evaluation. New expressions for the probability density function (PDF) and cumulative distribution function of the FTR model are obtained based on the observation that the FTR fading distribution is described, for arbitrary $m$, as an underlying Rician Shadowed (RS) distribution with continuously varying parameter $K$, while for the special case of $m$ being an integer, the FTR fading model is described in terms of a finite number of underlying squared Nakagami-$m$ distributions. It is shown that the chief statistics and any performance metric that are computed by averaging over the PDF of the FTR fading model can be expressed in terms of a finite-range integral over the corresponding statistic or performance metric for the RS (for arbitrary $m$) or the Nakagami-$m$ (for integer $m$) fading models, which have a simpler analytical characterization than the FTR model and for which many results are available in closed-form. New expressions for some Laplace-domain statistics of interest are also obtained; these are used to exemplify the practical relevance of this new formulation for performance analysis. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2108.02990v2-abstract-full').style.display = 'none'; document.getElementById('2108.02990v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 23 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 August, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2107.07734">arXiv:2107.07734</a> <span> [<a href="https://arxiv.org/pdf/2107.07734">pdf</a>, <a href="https://arxiv.org/format/2107.07734">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> A Fluctuating Line-of-Sight Fading Model with Double-Rayleigh Diffuse Scattering </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Lopez-Fernandez%2C+J">Jesus Lopez-Fernandez</a>, <a href="/search/eess?searchtype=author&query=Espinosa%2C+P+R">Pablo Ramirez Espinosa</a>, <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2107.07734v1-abstract-short" style="display: inline;"> We introduce the fdRLoS fading model as a natural generalization of the double-Rayleigh with line-of-sight fading model, on which the constant-amplitude line-of-sight component is now allowed to randomly fluctuate. We discuss the key benefits of the fdRLoS fading model here formulated over the state of the art, and provide an analytical characterization of its chief probability functions. We analy… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.07734v1-abstract-full').style.display = 'inline'; document.getElementById('2107.07734v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2107.07734v1-abstract-full" style="display: none;"> We introduce the fdRLoS fading model as a natural generalization of the double-Rayleigh with line-of-sight fading model, on which the constant-amplitude line-of-sight component is now allowed to randomly fluctuate. We discuss the key benefits of the fdRLoS fading model here formulated over the state of the art, and provide an analytical characterization of its chief probability functions. We analyze the effect of the fading parameters that define the model, and discuss their impact on the performance of wireless communication systems. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2107.07734v1-abstract-full').style.display = 'none'; document.getElementById('2107.07734v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 July, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Article with 4 pages and 4 figures containing original research results for wireless fading modelling. Submmited to Transactions on Vehicular Technologies (TVT) - Correspondence - on July the 16th, 2021</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2104.13690">arXiv:2104.13690</a> <span> [<a href="https://arxiv.org/pdf/2104.13690">pdf</a>, <a href="https://arxiv.org/format/2104.13690">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/LWC.2021.3101940">10.1109/LWC.2021.3101940 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Low-Complexity Distance-Based Scheduling for Multi-User XL-MIMO Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Gonz%C3%A1lez-Coma%2C+J+P">Jos茅 P. Gonz谩lez-Coma</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Castedo%2C+L">Luis Castedo</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2104.13690v1-abstract-short" style="display: inline;"> We introduce DBS, a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent distance to the antenna array. Such categorization effectively accounts for inter-user interference while largely reducing the computational burden. Results show that (i) DBS achieves the same performance as the referen… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13690v1-abstract-full').style.display = 'inline'; document.getElementById('2104.13690v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2104.13690v1-abstract-full" style="display: none;"> We introduce DBS, a new technique for user selection in downlink multi-user communications with extra-large (XL) antenna arrays. DBS categorizes users according to their equivalent distance to the antenna array. Such categorization effectively accounts for inter-user interference while largely reducing the computational burden. Results show that (i) DBS achieves the same performance as the reference zero-forcing beamforming scheme with a lower complexity; (ii) a simplified version of DBS achieves a similar performance when realistic spherical-wavefront (SW) propagation features are considered; (iii) SW propagation brings additional degrees of freedom, which allows for increasing the number of served users. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2104.13690v1-abstract-full').style.display = 'none'; document.getElementById('2104.13690v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 28 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2021. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.12859">arXiv:2007.12859</a> <span> [<a href="https://arxiv.org/pdf/2007.12859">pdf</a>, <a href="https://arxiv.org/ps/2007.12859">ps</a>, <a href="https://arxiv.org/format/2007.12859">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Physical Layer Security of Large Reflecting Surface Aided Communications with Phase Errors </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Sanchez%2C+J+D+V">Jose David Vega Sanchez</a>, <a href="/search/eess?searchtype=author&query=Ramirez-Espinosa%2C+P">Pablo Ramirez-Espinosa</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.12859v1-abstract-short" style="display: inline;"> The physical layer security (PLS) performance of a wireless communication link through a large reflecting surface (LRS) with phase errors is analyzed. Leveraging recent results that express the \ac{LRS}-based composite channel as an equivalent scalar fading channel, we show that the eavesdropper's link is Rayleigh distributed and independent of the legitimate link. The different scaling laws of th… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.12859v1-abstract-full').style.display = 'inline'; document.getElementById('2007.12859v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.12859v1-abstract-full" style="display: none;"> The physical layer security (PLS) performance of a wireless communication link through a large reflecting surface (LRS) with phase errors is analyzed. Leveraging recent results that express the \ac{LRS}-based composite channel as an equivalent scalar fading channel, we show that the eavesdropper's link is Rayleigh distributed and independent of the legitimate link. The different scaling laws of the legitimate and eavesdroppers signal-to-noise ratios with the number of reflecting elements, and the reasonably good performance even in the case of coarse phase quantization, show the great potential of LRS-aided communications to enhance PLS in practical wireless set-ups. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.12859v1-abstract-full').style.display = 'none'; document.getElementById('2007.12859v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2007.08162">arXiv:2007.08162</a> <span> [<a href="https://arxiv.org/pdf/2007.08162">pdf</a>, <a href="https://arxiv.org/format/2007.08162">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> A Product Channel Attack to Wireless Physical Layer Security </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Anaya-Lopez%2C+G+J">Gonzalo J. Anaya-Lopez</a>, <a href="/search/eess?searchtype=author&query=Gomez%2C+G">Gerardo Gomez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2007.08162v1-abstract-short" style="display: inline;"> We propose a novel attack that compromises the physical layer security of downlink (DL) communications in wireless systems. This technique is based on the transmission of a slowly-varying random symbol by the eavesdropper during its uplink transmission, so that the equivalent fading channel observed at the base station (BS) has a larger variance. Then, the BS designs the secure DL transmission und… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.08162v1-abstract-full').style.display = 'inline'; document.getElementById('2007.08162v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2007.08162v1-abstract-full" style="display: none;"> We propose a novel attack that compromises the physical layer security of downlink (DL) communications in wireless systems. This technique is based on the transmission of a slowly-varying random symbol by the eavesdropper during its uplink transmission, so that the equivalent fading channel observed at the base station (BS) has a larger variance. Then, the BS designs the secure DL transmission under the assumption that the eavesdropper's channel experiences a larger fading severity than in reality. We show that this approach can lead the BS to transmit to Bob at a rate larger than the secrecy capacity, thus compromising the system secure operation. Our analytical results, corroborated by simulations, show that the use of multiple antennas at the BS may partially alleviate but not immunize against these type of attacks. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2007.08162v1-abstract-full').style.display = 'none'; document.getElementById('2007.08162v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 16 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">5 pages, 4 figures. This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2005.01648">arXiv:2005.01648</a> <span> [<a href="https://arxiv.org/pdf/2005.01648">pdf</a>, <a href="https://arxiv.org/format/2005.01648">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Effect of Correlation between Information and Energy Links in Secure Wireless Powered Communications </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Tarr%C3%ADas-Mu%C3%B1oz%2C+A">Antonio Tarr铆as-Mu帽oz</a>, <a href="/search/eess?searchtype=author&query=Matez-Bandera%2C+J+L">Jos茅 Luis Matez-Bandera</a>, <a href="/search/eess?searchtype=author&query=Ram%C3%ADrez-Espinosa%2C+P">Pablo Ram铆rez-Espinosa</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2005.01648v1-abstract-short" style="display: inline;"> In this paper, we investigate the impact of correlation between the energy and information links in wireless power transfer systems, from a physical layer security perspective. With that aim, we first determine how correlation can affect system capacity in practical energy harvesting set-ups in the absence of eavesdroppers. We quantify that even though link correlation improves the average signal-… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01648v1-abstract-full').style.display = 'inline'; document.getElementById('2005.01648v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2005.01648v1-abstract-full" style="display: none;"> In this paper, we investigate the impact of correlation between the energy and information links in wireless power transfer systems, from a physical layer security perspective. With that aim, we first determine how correlation can affect system capacity in practical energy harvesting set-ups in the absence of eavesdroppers. We quantify that even though link correlation improves the average signal-to-noise ratio (SNR) for a fixed transmit power, it also increases its variance, which ultimately degrades capacity. Based on this observation, we show that correlation between the energy and information links may be detrimental/beneficial for the secrecy capacity in the high/low legitimate SNR regime, whenever such correlation affects the legitimate user. Conversely, we also point out that when link correlation for the wiretap link is rigorously accounted for, it barely affects secrecy performance, causing only a minor degradation in some instances. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2005.01648v1-abstract-full').style.display = 'none'; document.getElementById('2005.01648v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 4 May, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for possible publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2003.05375">arXiv:2003.05375</a> <span> [<a href="https://arxiv.org/pdf/2003.05375">pdf</a>, <a href="https://arxiv.org/format/2003.05375">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> On the Effect of Correlation on the Capacity of Backscatter Communication Systems </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Matez-Bandera%2C+J+L">J. L. Matez-Bandera</a>, <a href="/search/eess?searchtype=author&query=Ramirez-Espinosa%2C+P">P. Ramirez-Espinosa</a>, <a href="/search/eess?searchtype=author&query=Vega-Sanchez%2C+J+D">J. D. Vega-Sanchez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. J. Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2003.05375v1-abstract-short" style="display: inline;"> We analyse the effect of correlation between the forward and backward links on the capacity of backscatter communication systems. To that aim, we obtain an analytical expression for the average capacity under a correlated Rayleigh product fading channel, as well as closed-form asymptotic expressions for the high and low signal-to-noise ratio (SNR) regimes. Our results show that correlation is inde… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.05375v1-abstract-full').style.display = 'inline'; document.getElementById('2003.05375v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2003.05375v1-abstract-full" style="display: none;"> We analyse the effect of correlation between the forward and backward links on the capacity of backscatter communication systems. To that aim, we obtain an analytical expression for the average capacity under a correlated Rayleigh product fading channel, as well as closed-form asymptotic expressions for the high and low signal-to-noise ratio (SNR) regimes. Our results show that correlation is indeed detrimental for a fixed target SNR; contrarily to the common belief, we also see that correlation can be actually beneficial in some instances when a fixed power budget is considered. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2003.05375v1-abstract-full').style.display = 'none'; document.getElementById('2003.05375v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 11 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2020. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2002.05206">arXiv:2002.05206</a> <span> [<a href="https://arxiv.org/pdf/2002.05206">pdf</a>, <a href="https://arxiv.org/ps/2002.05206">ps</a>, <a href="https://arxiv.org/format/2002.05206">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> On the Secrecy Performance Over N-Wave with Diffuse Power Fading Channel </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=S%C3%A1nchez%2C+J+D+V">Jos茅 David Vega S谩nchez</a>, <a href="/search/eess?searchtype=author&query=Osorio%2C+D+P+M">Diana Pamela Moya Osorio</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a>, <a href="/search/eess?searchtype=author&query=Paredes%2C+M+C">Martha Cecilia Paredes</a>, <a href="/search/eess?searchtype=author&query=Urquiza-Aguiar%2C+L">Luis Urquiza-Aguiar</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2002.05206v2-abstract-short" style="display: inline;"> We investigate the physical layer security over N-wave with diffuse power (NWDP) fading model, which is typically encountered in realistic wireless scenarios in the context of millimeter-wave communications and emerging 5G technologies. More specifically, novel and exact expressions of the secrecy outage probability (SOP) and the lower bound of the secrecy outage probability are derived in terms o… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05206v2-abstract-full').style.display = 'inline'; document.getElementById('2002.05206v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2002.05206v2-abstract-full" style="display: none;"> We investigate the physical layer security over N-wave with diffuse power (NWDP) fading model, which is typically encountered in realistic wireless scenarios in the context of millimeter-wave communications and emerging 5G technologies. More specifically, novel and exact expressions of the secrecy outage probability (SOP) and the lower bound of the secrecy outage probability are derived in terms of well-known elementary and special functions. Furthermore, we provide very useful insights on the impact of increasing: the number, the relative amplitudes and the power of the dominant specular components for improving secrecy performance. In this context, we show that it is possible to achieve a very good secrecy performance when: (i) the relative amplitudes of the dominant specular components for the eavesdropper channel are sufficiently large compared to those relative amplitudes of the dominant components for the legitimate channel eavesdropper channel, and (ii) the power of the Bob's dominant components is significantly greater than the power of the Eve's dominant rays. The validity of the proposed expressions is confirmed via Monte Carlo simulations. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2002.05206v2-abstract-full').style.display = 'none'; document.getElementById('2002.05206v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 March, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 12 February, 2020; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> February 2020. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1910.09856">arXiv:1910.09856</a> <span> [<a href="https://arxiv.org/pdf/1910.09856">pdf</a>, <a href="https://arxiv.org/format/1910.09856">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Cryptography and Security">cs.CR</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> On the Beneficial Role of a Finite Number of Scatterers for Wireless Physical Layer Security </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ram%C3%ADrez-Espinosa%2C+P">Pablo Ram铆rez-Espinosa</a>, <a href="/search/eess?searchtype=author&query=S%C3%A1nchez-Alarc%C3%B3n%2C+R+J">R. Jos茅 S谩nchez-Alarc贸n</a>, <a href="/search/eess?searchtype=author&query=L%C3%B3pez-Mart%C3%ADnez%2C+F+J">F. Javier L贸pez-Mart铆nez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1910.09856v1-abstract-short" style="display: inline;"> We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatterers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no channel state information is available. Specifically, we show that the outage probability of secrecy capacity (OPSC) is zero for a given range of average signal-to-noise ratios (SNR… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09856v1-abstract-full').style.display = 'inline'; document.getElementById('1910.09856v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1910.09856v1-abstract-full" style="display: none;"> We show that for a legitimate communication under multipath quasi-static fading with a reduced number of scatterers, it is possible to achieve perfect secrecy even in the presence of a passive eavesdropper for which no channel state information is available. Specifically, we show that the outage probability of secrecy capacity (OPSC) is zero for a given range of average signal-to-noise ratios (SNRs) at the legitimate and eavesdropper's receivers. As an application example, we analyze the OPSC for the case of two scatterers, explicitly deriving the relationship between the average SNRs, the secrecy rate $R_s$ and the fading model parameters required for achieving perfect secrecy. The impact of increasing the number of scatterers is also analyzed, showing that it is always possible to achieve perfect secrecy in this scenario, provided that the dominant specular component for the legitimate channel is sufficiently large compared to the remaining scattered waves. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1910.09856v1-abstract-full').style.display = 'none'; document.getElementById('1910.09856v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 October, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 2019. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.03567">arXiv:1905.03567</a> <span> [<a href="https://arxiv.org/pdf/1905.03567">pdf</a>, <a href="https://arxiv.org/format/1905.03567">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Stochastic Fading Channel Models with Multiple Dominant Specular Components for 5G and Beyond </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Romero-Jerez%2C+J+M">Juan M. Romero-Jerez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a>, <a href="/search/eess?searchtype=author&query=Pe%C3%B1a-Martin%2C+J+P">Juan P. Pe帽a-Martin</a>, <a href="/search/eess?searchtype=author&query=Abdi%2C+A">Ali Abdi</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.03567v1-abstract-short" style="display: inline;"> We introduce a comprehensive statistical characterization of the multipath wireless channel built as a superposition of a number of scattered waves with random phases. We consider an arbitrary number $N$ of specular (dominant) components plus other diffusely propagating waves. Our approach covers the cases on which the specular components have constant amplitudes, as well as when these components… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.03567v1-abstract-full').style.display = 'inline'; document.getElementById('1905.03567v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.03567v1-abstract-full" style="display: none;"> We introduce a comprehensive statistical characterization of the multipath wireless channel built as a superposition of a number of scattered waves with random phases. We consider an arbitrary number $N$ of specular (dominant) components plus other diffusely propagating waves. Our approach covers the cases on which the specular components have constant amplitudes, as well as when these components experience random fluctuations. These propagation scenarios are found in different use cases of 5G networks, as well as in the context of large intelligent surface based communications. We show that this class of fading models can be expressed in terms of a continuous mixture of an underlying Rician (or Rician shadowed) fading model, averaged over the phase distributions of the specular waves. It is shown that the fluctuations of the specular components have a detrimental impact on performance, and the best performance is obtained when there is only one specular component. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.03567v1-abstract-full').style.display = 'none'; document.getElementById('1905.03567v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.00069">arXiv:1905.00069</a> <span> [<a href="https://arxiv.org/pdf/1905.00069">pdf</a>, <a href="https://arxiv.org/format/1905.00069">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> </div> <p class="title is-5 mathjax"> Composite Fading Models based on Inverse Gamma Shadowing: Theory and Validation </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Ram%C3%ADrez-Espinosa%2C+P">Pablo Ram铆rez-Espinosa</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.00069v5-abstract-short" style="display: inline;"> We introduce a general approach to characterize composite fading models based on inverse gamma (IG) shadowing. We first determine to what extent the IG distribution is an adequate choice for modeling shadow fading, by means of a comprehensive test with field measurements and other distributions conventionally used for this purpose. Then, we prove that the probability density function and cumulativ… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00069v5-abstract-full').style.display = 'inline'; document.getElementById('1905.00069v5-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.00069v5-abstract-full" style="display: none;"> We introduce a general approach to characterize composite fading models based on inverse gamma (IG) shadowing. We first determine to what extent the IG distribution is an adequate choice for modeling shadow fading, by means of a comprehensive test with field measurements and other distributions conventionally used for this purpose. Then, we prove that the probability density function and cumulative distribution function of any IG-based composite fading model are directly expressed in terms of a Laplace-domain statistic of the underlying fast fading model and, in some relevant cases, as a mixture of wellknown state-of-the-art distributions. Also, exact and asymptotic expressions for the outage probability are provided, which are valid for any choice of baseline fading distribution. Finally, we exemplify our approach by presenting several application examples for IG-based composite fading models, for which their statistical characterization is directly obtained in a simple form. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00069v5-abstract-full').style.display = 'none'; document.getElementById('1905.00069v5-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 April, 2021; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 30 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.00065">arXiv:1905.00065</a> <span> [<a href="https://arxiv.org/pdf/1905.00065">pdf</a>, <a href="https://arxiv.org/format/1905.00065">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/ACCESS.2019.2921632">10.1109/ACCESS.2019.2921632 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Unveiling the Hyper-Rayleigh Regime of the Fluctuating Two-Ray Fading Model </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Garcia-Corrales%2C+C">Celia Garcia-Corrales</a>, <a href="/search/eess?searchtype=author&query=Fernandez-Plazaola%2C+U">Unai Fernandez-Plazaola</a>, <a href="/search/eess?searchtype=author&query=Ca%C3%B1ete%2C+F+J">Francisco J. Ca帽ete</a>, <a href="/search/eess?searchtype=author&query=Paris%2C+J+F">Jos茅 F. Paris</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. Javier Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.00065v1-abstract-short" style="display: inline;"> The recently proposed Fluctuating Two-Ray (FTR) model is gaining momentum as a reference fading model in scenarios where two dominant specular waves are present. Despite the numerous research works devoted to the performance analysis under FTR fading, little attention has been paid to effectively understanding the interplay between the fading model parameters and the fading severity. According to… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00065v1-abstract-full').style.display = 'inline'; document.getElementById('1905.00065v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.00065v1-abstract-full" style="display: none;"> The recently proposed Fluctuating Two-Ray (FTR) model is gaining momentum as a reference fading model in scenarios where two dominant specular waves are present. Despite the numerous research works devoted to the performance analysis under FTR fading, little attention has been paid to effectively understanding the interplay between the fading model parameters and the fading severity. According to a new scale defined in this work, which measures the hyper-Rayleigh character of a fading channel in terms of the Amount of Fading, the outage probability and the average capacity, we see that the FTR fading model exhibits a full hyper-Rayleigh behavior. However, the Two-Wave with Diffuse Power fading model from which the former is derived has only strong hyper-Rayleigh behavior, which constitutes an interesting new insight. We also identify that the random fluctuations in the dominant specular waves are ultimately responsible for the full hyper-Rayleigh behavior of this class of fading channels. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.00065v1-abstract-full').style.display = 'none'; document.getElementById('1905.00065v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 30 April, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">This work has been submitted to the IEEE for publication. Copyright may be transferred without notice, after which this version may no longer be accesible</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1807.08978">arXiv:1807.08978</a> <span> [<a href="https://arxiv.org/pdf/1807.08978">pdf</a>, <a href="https://arxiv.org/format/1807.08978">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Signal Processing">eess.SP</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1109/TVT.2018.2877941">10.1109/TVT.2018.2877941 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Statistical Characterization of Second Order Scattering Fading Channels </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Lopez-Fernandez%2C+J">J. Lopez-Fernandez</a>, <a href="/search/eess?searchtype=author&query=Lopez-Martinez%2C+F+J">F. J. Lopez-Martinez</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1807.08978v1-abstract-short" style="display: inline;"> We present a new approach to the statistical characterization of the second order scattering fading (SOSF) channel model, which greatly simplifies its analysis. Exploiting the unadvertised fact that the SOSF channel can be seen as a continuous mixture of Rician fading channels, we obtain expressions for its probability density function and cumulative density function that are numerically better-be… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.08978v1-abstract-full').style.display = 'inline'; document.getElementById('1807.08978v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1807.08978v1-abstract-full" style="display: none;"> We present a new approach to the statistical characterization of the second order scattering fading (SOSF) channel model, which greatly simplifies its analysis. Exploiting the unadvertised fact that the SOSF channel can be seen as a continuous mixture of Rician fading channels, we obtain expressions for its probability density function and cumulative density function that are numerically better-behaved than those available in the literature. Our approach allows for obtaining new results for the SOSF model, such as a closed-form expression for its moment-generating function, as well as the characterization of the average channel capacity. Relevantly, and somehow counterintuitively, we observe that in the presence of a strong line-of-sight (LOS) component, the channel capacity of a LOS plus double-Rayleigh scattered diffuse component is larger than its LOS plus Rayleigh (i.e Rician-like) counterpart. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1807.08978v1-abstract-full').style.display = 'none'; document.getElementById('1807.08978v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 24 July, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 2018. </p> </li> </ol> <div class="is-hidden-tablet">  <span class="help" style="display: inline-block;"><a href="https://github.com/arXiv/arxiv-search/releases">Search v0.5.6 released 2020-02-24</a>  </span> </div> </div> </main> <footer> <div class="columns is-desktop" role="navigation" 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