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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/2410.16980">arXiv:2410.16980</a> <span> [<a href="https://arxiv.org/pdf/2410.16980">pdf</a>, <a href="https://arxiv.org/ps/2410.16980">ps</a>, <a href="https://arxiv.org/format/2410.16980">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Systems and Control">eess.SY</span> </div> </div> <p class="title is-5 mathjax"> Electrode SOC and SOH estimation with electrode-level ECMs </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Lopetegi%2C+I">Iker Lopetegi</a>, <a href="/search/eess?searchtype=author&query=Fernandez%2C+S">Sergio Fernandez</a>, <a href="/search/eess?searchtype=author&query=Plett%2C+G+L">Gregory L. Plett</a>, <a href="/search/eess?searchtype=author&query=Trimboli%2C+M+S">M. Scott Trimboli</a>, <a href="/search/eess?searchtype=author&query=Iraola%2C+U">Unai Iraola</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="2410.16980v1-abstract-short" style="display: inline;"> Being able to predict battery internal states that are related to battery degradation is a key aspect to improve battery lifetime and performance, enhancing cleaner electric transportation and energy generation. However, most present battery management systems (BMSs) use equivalent-circuit models (ECMs) for state of charge (SOC) and state of health (SOH) estimation. These models are not able to pr… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.16980v1-abstract-full').style.display = 'inline'; document.getElementById('2410.16980v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2410.16980v1-abstract-full" style="display: none;"> Being able to predict battery internal states that are related to battery degradation is a key aspect to improve battery lifetime and performance, enhancing cleaner electric transportation and energy generation. However, most present battery management systems (BMSs) use equivalent-circuit models (ECMs) for state of charge (SOC) and state of health (SOH) estimation. These models are not able to predict these aging-related variables, and therefore, they cannot be used to limit battery degradation. In this paper, we propose a method for electrode-level SOC (eSOC) and electrode-level SOH (eSOH) estimation using an electrode-level ECM (eECM). The method can produce estimates of the states of lithiation (SOL) of both electrodes and update the eSOH parameters to maintain estimation accuracy through the lifetime of the battery. Furthermore, the eSOH parameter estimates are used to obtain degradation mode information, which could be used to improve state estimation, health diagnosis and prognosis. The method was validated in simulation and experimentally. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2410.16980v1-abstract-full').style.display = 'none'; document.getElementById('2410.16980v1-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, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> October 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/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/2305.10348">arXiv:2305.10348</a> <span> [<a href="https://arxiv.org/pdf/2305.10348">pdf</a>, <a href="https://arxiv.org/format/2305.10348">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> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Information Theory">cs.IT</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Optics">physics.optics</span> </div> </div> <p class="title is-5 mathjax"> Data-Driven Modeling of Directly-Modulated Lasers </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Fernandez%2C+S+H">Sergio Hernandez Fernandez</a>, <a href="/search/eess?searchtype=author&query=Peucheret%2C+C">Christophe Peucheret</a>, <a href="/search/eess?searchtype=author&query=Jovanovic%2C+O">Ognjen Jovanovic</a>, <a href="/search/eess?searchtype=author&query=Da+Ros%2C+F">Francesco Da Ros</a>, <a href="/search/eess?searchtype=author&query=Zibar%2C+D">Darko Zibar</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="2305.10348v1-abstract-short" style="display: inline;"> The end-to-end optimization of links based on directly-modulated lasers may require an analytically differentiable channel. We overcome this problem by developing and comparing differentiable laser models based on machine learning techniques. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2305.10348v1-abstract-full" style="display: none;"> The end-to-end optimization of links based on directly-modulated lasers may require an analytically differentiable channel. We overcome this problem by developing and comparing differentiable laser models based on machine learning techniques. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2305.10348v1-abstract-full').style.display = 'none'; document.getElementById('2305.10348v1-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 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">4 pages, 6 figures, submitted to european conference on optical communcations 2023</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2207.00190">arXiv:2207.00190</a> <span> [<a href="https://arxiv.org/pdf/2207.00190">pdf</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"> Range of Motion Sensors for Monitoring Recovery of Total Knee Arthroplasty </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/eess?searchtype=author&query=Cao%2C+M">Minh Cao</a>, <a href="/search/eess?searchtype=author&query=Bailey%2C+B">Brett Bailey</a>, <a href="/search/eess?searchtype=author&query=Zhang%2C+W">Wenhao Zhang</a>, <a href="/search/eess?searchtype=author&query=Fernandez%2C+S">Solana Fernandez</a>, <a href="/search/eess?searchtype=author&query=Han%2C+A">Aaron Han</a>, <a href="/search/eess?searchtype=author&query=Narayanan%2C+S">Smiti Narayanan</a>, <a href="/search/eess?searchtype=author&query=Patel%2C+S">Shrineel Patel</a>, <a href="/search/eess?searchtype=author&query=Saletta%2C+S">Steven Saletta</a>, <a href="/search/eess?searchtype=author&query=Stavrakis%2C+A">Alexandra Stavrakis</a>, <a href="/search/eess?searchtype=author&query=Speicher%2C+S">Stephen Speicher</a>, <a href="/search/eess?searchtype=author&query=Seidlits%2C+S">Stephanie Seidlits</a>, <a href="/search/eess?searchtype=author&query=Naeim%2C+A">Arash Naeim</a>, <a href="/search/eess?searchtype=author&query=Ramezani%2C+R">Ramin Ramezani</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="2207.00190v1-abstract-short" style="display: inline;"> A low-cost, accurate device to measure and record knee range of motion (ROM) is of the essential need to improve confidence in at-home rehabilitation. It is to reduce hospital stay duration and overall medical cost after Total Knee Arthroplasty (TKA) procedures. The shift in Medicare funding from pay-as-you-go to the Bundled Payments for Care Improvement (BPCI) has created a push towards at-home c… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.00190v1-abstract-full').style.display = 'inline'; document.getElementById('2207.00190v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2207.00190v1-abstract-full" style="display: none;"> A low-cost, accurate device to measure and record knee range of motion (ROM) is of the essential need to improve confidence in at-home rehabilitation. It is to reduce hospital stay duration and overall medical cost after Total Knee Arthroplasty (TKA) procedures. The shift in Medicare funding from pay-as-you-go to the Bundled Payments for Care Improvement (BPCI) has created a push towards at-home care over extended hospital stays. It has heavily affected TKA patients, who typically undergo physical therapy at the clinic after the procedure to ensure full recovery of ROM. In this paper, we use accelerometers to create a ROM sensor that can be integrated into the post-operative surgical dressing, so that the cost of the sensors can be included in the bundled payments. In this paper, we demonstrate the efficacy of our method in comparison to the baseline computer vision method. Our results suggest that calculating angular displacement from accelerometer sensors demonstrates accurate ROM recordings under both stationary and walking conditions. The device would keep track of angle measurements and alert the patient when certain angle thresholds have been crossed, allowing patients to recover safely at home instead of going to multiple physical therapy sessions. The affordability of our sensor makes it more accessible to patients in need. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2207.00190v1-abstract-full').style.display = 'none'; document.getElementById('2207.00190v1-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 June, 2022; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> July 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">8 pages, 16 figures, 1 table, submitted to BSN conference 2022</span> </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 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