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MIMO</title> <meta name="description" content="Search results for: distributed MIMO"> <meta name="keywords" content="distributed MIMO"> <meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1, maximum-scale=1, user-scalable=no"> <meta charset="utf-8"> <link href="https://cdn.waset.org/favicon.ico" type="image/x-icon" rel="shortcut icon"> <link href="https://cdn.waset.org/static/plugins/bootstrap-4.2.1/css/bootstrap.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/plugins/fontawesome/css/all.min.css" rel="stylesheet"> <link href="https://cdn.waset.org/static/css/site.css?v=150220211555" rel="stylesheet"> </head> <body> <header> <div class="container"> <nav class="navbar navbar-expand-lg navbar-light"> <a class="navbar-brand" href="https://waset.org"> <img src="https://cdn.waset.org/static/images/wasetc.png" alt="Open Science Research Excellence" title="Open Science Research Excellence" /> </a> <button class="d-block d-lg-none navbar-toggler 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id="custom-search-input"> <div class="input-group"> <i class="fas fa-search"></i> <input type="text" class="search-query" name="q" placeholder="Author, Title, Abstract, Keywords" value="distributed MIMO"> <input type="submit" class="btn_search" value="Search"> </div> </div> </form> </div> </div> <div class="row mt-3"> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Commenced</strong> in January 2007</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Frequency:</strong> Monthly</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Edition:</strong> International</div> </div> </div> <div class="col-sm-3"> <div class="card"> <div class="card-body"><strong>Paper Count:</strong> 2098</div> </div> </div> </div> <h1 class="mt-3 mb-3 text-center" style="font-size:1.6rem;">Search results for: distributed MIMO</h1> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2098</span> Performance Evaluation of Distributed and Co-Located MIMO LTE Physical Layer Using Wireless Open-Access Research Platform</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ishak%20Suleiman">Ishak Suleiman</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Kamsani%20Samingan"> Ahmad Kamsani Samingan</a>, <a href="https://publications.waset.org/abstracts/search?q=Yeoh%20Chun%20Yeow"> Yeoh Chun Yeow</a>, <a href="https://publications.waset.org/abstracts/search?q=Abdul%20Aziz%20Bin%20Abdul%20Rahman"> Abdul Aziz Bin Abdul Rahman</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we evaluate the benefits of distributed 4x4 MIMO LTE downlink systems compared to that of the co-located 4x4 MIMO LTE downlink system. The performance evaluation was carried out experimentally by using Wireless Open-Access Research Platform (WARP), where the comparison between the 4x4 MIMO LTE transmission downlink system in distributed and co-located techniques was examined. The measured Error Vector Magnitude (EVM) results showed that the distributed technique achieved better system performance compared to the co-located arrangement. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=multiple-input-multiple-output%20%28MIMO%29" title="multiple-input-multiple-output (MIMO)">multiple-input-multiple-output (MIMO)</a>, <a href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO" title=" distributed MIMO"> distributed MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=co-located%20MIMO" title=" co-located MIMO"> co-located MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=LTE" title=" LTE"> LTE</a> </p> <a href="https://publications.waset.org/abstracts/52382/performance-evaluation-of-distributed-and-co-located-mimo-lte-physical-layer-using-wireless-open-access-research-platform" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52382.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">422</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2097</span> A Golay Pair Based Synchronization Algorithm for Distributed Multiple-Input Multiple-Output System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Weizhi%20Zhong">Weizhi Zhong</a>, <a href="https://publications.waset.org/abstracts/search?q=Xiaoyi%20Lu"> Xiaoyi Lu</a>, <a href="https://publications.waset.org/abstracts/search?q=Lei%20Xu"> Lei Xu</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In order to solve the problem of inaccurate synchronization for distributed multiple-input multiple-output (MIMO) system in multipath environment, a golay pair aided timing synchronization method is proposed in this paper. A new synchronous training sequence based on golay pair is designed. By utilizing the aperiodic auto-correlation complementary property of the new training sequence, the fine timing point is obtained at the receiver. Simulation results show that, compared with the tradition timing synchronization approaches, the proposed algorithm can provide high accuracy in synchronization, especially under multipath condition. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO%20system" title="distributed MIMO system">distributed MIMO system</a>, <a href="https://publications.waset.org/abstracts/search?q=golay%20pair" title=" golay pair"> golay pair</a>, <a href="https://publications.waset.org/abstracts/search?q=multipath" title=" multipath"> multipath</a>, <a href="https://publications.waset.org/abstracts/search?q=synchronization" title=" synchronization"> synchronization</a> </p> <a href="https://publications.waset.org/abstracts/72014/a-golay-pair-based-synchronization-algorithm-for-distributed-multiple-input-multiple-output-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/72014.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">247</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2096</span> Robustness of MIMO-OFDM Schemes for Future Digital TV to Carrier Frequency Offset</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=D.%20Sankara%20Reddy">D. Sankara Reddy</a>, <a href="https://publications.waset.org/abstracts/search?q=T.%20Kranthi%20Kumar"> T. Kranthi Kumar</a>, <a href="https://publications.waset.org/abstracts/search?q=K.%20Sreevani"> K. Sreevani</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper investigates the impact of carrier frequency offset (CFO) on the performance of different MIMO-OFDM schemes with high spectral efficiency for next generation of terrestrial digital TV. We show that all studied MIMO-OFDM schemes are sensitive to CFO when it is greater than 1% of intercarrier spacing. We show also that the Alamouti scheme is the most sensitive MIMO scheme to CFO. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=modulation%20and%20multiplexing%20%28MIMO-OFDM%29" title="modulation and multiplexing (MIMO-OFDM)">modulation and multiplexing (MIMO-OFDM)</a>, <a href="https://publications.waset.org/abstracts/search?q=signal%20processing%20for%20transmission%0D%0Acarrier%20frequency%20offset" title=" signal processing for transmission carrier frequency offset"> signal processing for transmission carrier frequency offset</a>, <a href="https://publications.waset.org/abstracts/search?q=future%20digital%20TV" title=" future digital TV"> future digital TV</a>, <a href="https://publications.waset.org/abstracts/search?q=imaging%20and%20signal%20processing" title=" imaging and signal processing"> imaging and signal processing</a> </p> <a href="https://publications.waset.org/abstracts/22713/robustness-of-mimo-ofdm-schemes-for-future-digital-tv-to-carrier-frequency-offset" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/22713.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">487</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2095</span> Novel Microstrip MIMO Antenna for 3G/4G Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Sandro%20Samir%20Nasief">Sandro Samir Nasief</a>, <a href="https://publications.waset.org/abstracts/search?q=Hussein%20Hamed%20Ghouz"> Hussein Hamed Ghouz</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Fathy"> Mohamed Fathy</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A compact ultra-wide band micro-strip MIMO antenna is introduced. The antenna consists of two elements each of size 24X24 mm2 (square millimetre) while the total MIMO size is 58X24 mm2 after the spacing between MIMO elements and adding a decouple circuit. The first one covers from 3.29 to 6.9 GHZ using digital ground and the second antenna covers from 8.76 to 13.27 GHZ using defective ground. This type of antenna is used for 3G and 4G applications. The introduction for the antenna structure and the parametric study (reflection coefficients, gain, coupling and decoupling) will be introduced. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=micro-strip%20antenna" title="micro-strip antenna">micro-strip antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=digital%20ground" title=" digital ground"> digital ground</a>, <a href="https://publications.waset.org/abstracts/search?q=defective%20ground" title=" defective ground"> defective ground</a>, <a href="https://publications.waset.org/abstracts/search?q=decouple%20circuit" title=" decouple circuit"> decouple circuit</a>, <a href="https://publications.waset.org/abstracts/search?q=bandwidth" title=" bandwidth"> bandwidth</a> </p> <a href="https://publications.waset.org/abstracts/4377/novel-microstrip-mimo-antenna-for-3g4g-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/4377.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">365</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2094</span> Angle of Arrival Estimation Using Maximum Likelihood Method</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Olomon%20Wu">Olomon Wu</a>, <a href="https://publications.waset.org/abstracts/search?q=Hung%20Lu"> Hung Lu</a>, <a href="https://publications.waset.org/abstracts/search?q=Nick%20Wilkins"> Nick Wilkins</a>, <a href="https://publications.waset.org/abstracts/search?q=Daniel%20Kerr"> Daniel Kerr</a>, <a href="https://publications.waset.org/abstracts/search?q=Zekeriya%20Aliyazicioglu"> Zekeriya Aliyazicioglu</a>, <a href="https://publications.waset.org/abstracts/search?q=H.%20K.%20Hwang"> H. K. Hwang</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Multiple Input Multiple Output (MIMO) radar has received increasing attention in recent years. MIMO radar has many advantages over conventional phased array radar such as target detection, resolution enhancement, and interference suppression. In this paper, the results are presented from a simulation study of MIMO Uniformly-Spaced Linear Array (ULA) antennas. The performance is investigated under varied parameters, including varied array size, Pseudo Random (PN) sequence length, number of snapshots, and Signal to Noise Ratio (SNR). The results of MIMO are compared to a traditional array antenna. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MIMO%20radar" title="MIMO radar">MIMO radar</a>, <a href="https://publications.waset.org/abstracts/search?q=phased%20array%20antenna" title=" phased array antenna"> phased array antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=target%20detection" title=" target detection"> target detection</a>, <a href="https://publications.waset.org/abstracts/search?q=radar%20signal%20processing" title=" radar signal processing"> radar signal processing</a> </p> <a href="https://publications.waset.org/abstracts/2469/angle-of-arrival-estimation-using-maximum-likelihood-method" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2469.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">541</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2093</span> Bit Error Rate Performance of MIMO Systems for Wireless Communications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=E.%20Ghayoula">E. Ghayoula</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Haj%20Taieb"> M. Haj Taieb</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Bouallegue"> A. Bouallegue</a>, <a href="https://publications.waset.org/abstracts/search?q=J.%20Y.%20Chouinard"> J. Y. Chouinard</a>, <a href="https://publications.waset.org/abstracts/search?q=R.%20Ghayoula"> R. Ghayoula</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper evaluates the bit error rate (BER) performance of MIMO systems for wireless communication. MIMO uses multiple transmitting antennas, multiple receiving antennas and the space-time block codes to provide diversity. MIMO transmits signal encoded by space-time block (STBC) encoder through different transmitting antennas. These signals arrive at the receiver at slightly different times. Spatially separated multiple receiving antennas are employed to provide diversity reception to combat the effect of fading in the channel. This paper presents a detailed study of diversity coding for MIMO systems. STBC techniques are implemented and simulation results in terms of the BER performance with varying number of MIMO transmitting and receiving antennas are presented. Our results show how increasing the number of both transmit and receive antenna improves system performance and reduces the bit error rate. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MIMO%20systems" title="MIMO systems">MIMO systems</a>, <a href="https://publications.waset.org/abstracts/search?q=diversity" title=" diversity"> diversity</a>, <a href="https://publications.waset.org/abstracts/search?q=BER" title=" BER"> BER</a>, <a href="https://publications.waset.org/abstracts/search?q=MRRC" title=" MRRC"> MRRC</a>, <a href="https://publications.waset.org/abstracts/search?q=SIMO" title=" SIMO"> SIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=MISO" title=" MISO"> MISO</a>, <a href="https://publications.waset.org/abstracts/search?q=STBC" title=" STBC"> STBC</a>, <a href="https://publications.waset.org/abstracts/search?q=alamouti" title=" alamouti"> alamouti</a>, <a href="https://publications.waset.org/abstracts/search?q=SNR" title=" SNR"> SNR</a> </p> <a href="https://publications.waset.org/abstracts/23654/bit-error-rate-performance-of-mimo-systems-for-wireless-communications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/23654.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">490</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2092</span> Hybrid MIMO-OFDM Detection Scheme for High Performance</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Young-Min%20Ko">Young-Min Ko</a>, <a href="https://publications.waset.org/abstracts/search?q=Dong-Hyun%20Ha"> Dong-Hyun Ha</a>, <a href="https://publications.waset.org/abstracts/search?q=Chang-Bin%20Ha"> Chang-Bin Ha</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyoung-Kyu%20Song"> Hyoung-Kyu Song</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In recent years, a multi-antenna system is actively used to improve the performance of the communication. A MIMO-OFDM system can provide multiplexing gain or diversity gain. These gains are obtained in proportion to the increase of the number of antennas. In order to provide the optimal gain of the MIMO-OFDM system, various transmission and reception schemes are presented. This paper aims to propose a hybrid scheme that base station provides both diversity gain and multiplexing gain at the same time. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=DFE" title="DFE">DFE</a>, <a href="https://publications.waset.org/abstracts/search?q=diversity%20gain" title=" diversity gain"> diversity gain</a>, <a href="https://publications.waset.org/abstracts/search?q=hybrid" title=" hybrid"> hybrid</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=multiplexing%20gain." title=" multiplexing gain."> multiplexing gain.</a> </p> <a href="https://publications.waset.org/abstracts/32335/hybrid-mimo-ofdm-detection-scheme-for-high-performance" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/32335.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">685</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2091</span> MIMO UWB Antenna for Exploring Body Centric Communication</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Osama%20Aziz">Osama Aziz</a>, <a href="https://publications.waset.org/abstracts/search?q=Hamza%20Ahmad"> Hamza Ahmad</a>, <a href="https://publications.waset.org/abstracts/search?q=Muhibur%20Rahman"> Muhibur Rahman</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The performance of wireless communication systems has been suggested to be improved by UWB MIMO antenna systems. However, creating a successful UWB MIMO antenna is a difficult undertaking that calls for resolving a number of design issues, including radiation efficiency, size, and frequency range. This study's primary objective is to create a novel, highly effective, small-sized, ultra-wideband (UWB) multiple-input multiple-output (MIMO) antenna and investigate its potential applications in body-centric communication. Two radiating elements, shared ground plane, circular stubs, and t-shaped isolation elements are used to achieve the MIMO antenna. Outstanding multiplexing efficiency, significant peak gain across the entire UWB frequency spectrum, extremely low mutual coupling (S21=-16 dB), high diversity gain (DG>9), and low envelop correlation are achieved. The proposed antenna will be one of the promising candidates for body centric communication. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=UWB%20communication" title="UWB communication">UWB communication</a>, <a href="https://publications.waset.org/abstracts/search?q=UWB%20MIMO%20antennas" title=" UWB MIMO antennas"> UWB MIMO antennas</a>, <a href="https://publications.waset.org/abstracts/search?q=body-centric%20communication" title=" body-centric communication"> body-centric communication</a>, <a href="https://publications.waset.org/abstracts/search?q=diversity%20gain" title=" diversity gain"> diversity gain</a> </p> <a href="https://publications.waset.org/abstracts/179022/mimo-uwb-antenna-for-exploring-body-centric-communication" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/179022.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">74</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2090</span> Energy Saving Techniques for MIMO Decoders </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Zhuofan%20Cheng">Zhuofan Cheng</a>, <a href="https://publications.waset.org/abstracts/search?q=Qiongda%20Hu"> Qiongda Hu</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohammed%20El-Hajjar"> Mohammed El-Hajjar</a>, <a href="https://publications.waset.org/abstracts/search?q=Basel%20Halak"> Basel Halak</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Multiple-input multiple-output (MIMO) systems can allow significantly higher data rates compared to single-antenna-aided systems. They are expected to be a prominent part of the 5G communication standard. However, these decoders suffer from high power consumption. This work presents a design technique in order to improve the energy efficiency of MIMO systems; this facilitates their use in the next generation of battery-operated communication devices such as mobile phones and tablets. The proposed optimization approach consists of the use of low complexity lattice reduction algorithm in combination with an adaptive VLSI implementation. The proposed design has been realized and verified in 65nm technology. The results show that the proposed design is significantly more energy-efficient than conventional K-best MIMO systems. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=energy" title="energy">energy</a>, <a href="https://publications.waset.org/abstracts/search?q=lattice%20reduction" title=" lattice reduction"> lattice reduction</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=VLSI" title=" VLSI "> VLSI </a> </p> <a href="https://publications.waset.org/abstracts/45939/energy-saving-techniques-for-mimo-decoders" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/45939.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">328</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2089</span> Performance Analysis of MIMO-OFDM Using Convolution Codes with QAM Modulation</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=I%20Gede%20Puja%20Astawa">I Gede Puja Astawa</a>, <a href="https://publications.waset.org/abstracts/search?q=Yoedy%20Moegiharto"> Yoedy Moegiharto</a>, <a href="https://publications.waset.org/abstracts/search?q=Ahmad%20Zainudin"> Ahmad Zainudin</a>, <a href="https://publications.waset.org/abstracts/search?q=Imam%20Dui%20Agus%20Salim"> Imam Dui Agus Salim</a>, <a href="https://publications.waset.org/abstracts/search?q=Nur%20Annisa%20Anggraeni"> Nur Annisa Anggraeni</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Performance of Orthogonal Frequency Division Multiplexing (OFDM) system can be improved by adding channel coding (error correction code) to detect and correct the errors that occur during data transmission. One can use the convolution code. This paper presents performance of OFDM using Space Time Block Codes (STBC) diversity technique use QAM modulation with code rate 1/2. The evaluation is done by analyzing the value of Bit Error Rate (BER) vs. Energy per Bit to Noise Power Spectral Density Ratio (Eb/No). This scheme is conducted 256 sub-carrier which transmits Rayleigh multipath channel in OFDM system. To achieve a BER of 10-3 is required 30 dB SNR in SISO-OFDM scheme. For 2x2 MIMO-OFDM scheme requires 10 dB to achieve a BER of 10-3. For 4x4 MIMO-OFDM scheme requires 5 dB while adding convolution in a 4x4 MIMO-OFDM can improve performance up to 0 dB to achieve the same BER. This proves the existence of saving power by 3 dB of 4x4 MIMO-OFDM system without coding, power saving 7 dB of 2x2 MIMO-OFDM system without coding and significant power savings from SISO-OFDM system. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=convolution%20code" title="convolution code">convolution code</a>, <a href="https://publications.waset.org/abstracts/search?q=OFDM" title=" OFDM"> OFDM</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=QAM" title=" QAM"> QAM</a>, <a href="https://publications.waset.org/abstracts/search?q=BER" title=" BER"> BER</a> </p> <a href="https://publications.waset.org/abstracts/2398/performance-analysis-of-mimo-ofdm-using-convolution-codes-with-qam-modulation" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/2398.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">388</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2088</span> Compact Dual-band 4-MIMO Antenna Elements for 5G Mobile Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Fayad%20Ghawbar">Fayad Ghawbar</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The significance of the Multiple Input Multiple Output (MIMO) system in the 5G wireless communication system is essential to enhance channel capacity and provide a high data rate resulting in a need for dual-polarization in vertical and horizontal. Furthermore, size reduction is critical in a MIMO system to deploy more antenna elements requiring a compact, low-profile design. A compact dual-band 4-MIMO antenna system has been presented in this paper with pattern and polarization diversity. The proposed single antenna structure has been designed using two antenna layers with a C shape in the front layer and a partial slot with a U-shaped cut in the ground to enhance isolation. The single antenna is printed on an FR4 dielectric substrate with an overall size of 18 mm×18 mm×1.6 mm. The 4-MIMO antenna elements were printed orthogonally on an FR4 substrate with a size dimension of 36 × 36 × 1.6 mm3 with zero edge-to-edge separation distance. The proposed compact 4-MIMO antenna elements resonate at 3.4-3.6 GHz and 4.8-5 GHz. The s-parameters measurement and simulation results agree, especially in the lower band with a slight frequency shift of the measurement results at the upper band due to fabrication imperfection. The proposed design shows isolation above -15 dB and -22 dB across the 4-MIMO elements. The MIMO diversity performance has been evaluated in terms of efficiency, ECC, DG, TARC, and CCL. The total and radiation efficiency were above 50 % across all parameters in both frequency bands. The ECC values were lower than 0.10, and the DG results were about 9.95 dB in all antenna elements. TARC results exhibited values lower than 0 dB with values lower than -25 dB in all MIMO elements at the dual-bands. Moreover, the channel capacity losses in the MIMO system were depicted using CCL with values lower than 0.4 Bits/s/Hz. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=compact%20antennas" title="compact antennas">compact antennas</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO%20antenna%20system" title=" MIMO antenna system"> MIMO antenna system</a>, <a href="https://publications.waset.org/abstracts/search?q=5G%20communication" title=" 5G communication"> 5G communication</a>, <a href="https://publications.waset.org/abstracts/search?q=dual%20band" title=" dual band"> dual band</a>, <a href="https://publications.waset.org/abstracts/search?q=ECC" title=" ECC"> ECC</a>, <a href="https://publications.waset.org/abstracts/search?q=DG" title=" DG"> DG</a>, <a href="https://publications.waset.org/abstracts/search?q=TARC" title=" TARC"> TARC</a> </p> <a href="https://publications.waset.org/abstracts/146461/compact-dual-band-4-mimo-antenna-elements-for-5g-mobile-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/146461.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">143</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2087</span> 12x12 MIMO Terminal Antennas Covering the Whole LTE and WiFi Spectrum </h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Sanad">Mohamed Sanad</a>, <a href="https://publications.waset.org/abstracts/search?q=Noha%20Hassan"> Noha Hassan </a> </p> <p class="card-text"><strong>Abstract:</strong></p> A broadband resonant terminal antenna has been developed. It can be used in different MIMO arrangements such as 2x2, 4x4, 8x8, or even 12x12 MIMO configurations. The antenna covers the whole LTE and WiFi bands besides the existing 2G/3G bands (700-5800 MHz), without using any matching/tuning circuits. Matching circuits significantly reduce the efficiency of any antenna and reduce the battery life. They also reduce the bandwidth because they are frequency dependent. The antenna can be implemented in smartphone handsets, tablets, laptops, notebooks or any other terminal. It is also suitable for different IoT and vehicle applications. The antenna is manufactured from a flexible material and can be bent or folded and shaped in any form to fit any available space in any terminal. It is self-contained and does not need to use the ground plane, the chassis or any other component of the terminal. Hence, it can be mounted on any terminal at different positions and configurations. Its performance does not get affected by the terminal, regardless of its type, shape or size. Moreover, its performance does not get affected by the human body of the terminal’s users. Because of all these unique features of the antenna, multiples of them can be simultaneously used for MIMO diversity coverage in any terminal device with a high isolation and a low correlation factor between them. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=IOT" title="IOT">IOT</a>, <a href="https://publications.waset.org/abstracts/search?q=LTE" title=" LTE"> LTE</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=terminal%20antenna" title=" terminal antenna"> terminal antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=WiFi" title=" WiFi"> WiFi</a> </p> <a href="https://publications.waset.org/abstracts/86217/12x12-mimo-terminal-antennas-covering-the-whole-lte-and-wifi-spectrum" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/86217.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">186</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2086</span> Transmit Power Optimization for Cooperative Beamforming in Reverse-Link MIMO Ad-Hoc Networks</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Younghyun%20Jeon">Younghyun Jeon</a>, <a href="https://publications.waset.org/abstracts/search?q=Seungjoo%20Maeng"> Seungjoo Maeng</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the Ad-hoc network, the great interests regarding MIMO scheme leads to their combination, which is also utilized into its applicable network. We manage the field of the problem into Reverse-link MIMO Ad-hoc Network (RMAN) and propose the methodology to maximize the data rate with its power consumption using Node-Cooperative beamforming technique. Based on the result of mathematical optimization formulation, we design the algorithm to construct optimal orthogonal weight vector according to channel feedback and control its transmission power according to QoS-pricing value level. In simulation results, we show the validity of the proposed mathematical optimization result and algorithm which mean that the sum-rate of each link is converged into some point. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ad-hoc%20network" title="ad-hoc network">ad-hoc network</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=cooperative%20beamforming" title=" cooperative beamforming"> cooperative beamforming</a>, <a href="https://publications.waset.org/abstracts/search?q=transmit%20power" title=" transmit power "> transmit power </a> </p> <a href="https://publications.waset.org/abstracts/57761/transmit-power-optimization-for-cooperative-beamforming-in-reverse-link-mimo-ad-hoc-networks" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/57761.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">398</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2085</span> Hierarchical Scheme for Detection of Rotating Mimo Visible Light Communication Systems Using Mobile Phone Camera</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Shih-Hao%20Chen">Shih-Hao Chen</a>, <a href="https://publications.waset.org/abstracts/search?q=Chi-Wai%20Chow"> Chi-Wai Chow</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Multiple-input and multiple-output (MIMO) scheme can extend the transmission capacity for the light-emitting-diode (LED) visible light communication (VLC) system. The MIMO VLC system using the popular mobile-phone camera as the optical receiver (Rx) to receive MIMO signal from n x n Red-Green-Blue (RGB) LED array is desirable. The key step of decoding the received RGB LED array signals is detecting the direction of received array signals. If the LED transmitter (Tx) is rotated, the signal may not be received correctly and cause an error in the received signal. In this work, we propose and demonstrate a novel hierarchical transmission scheme which can reduce the computation complexity of rotation detection in LED array VLC system. We use the n x n RGB LED array as the MIMO Tx. A novel two dimension Hadamard coding scheme is proposed and demonstrated. The detection correction rate is above 95% in the indoor usage distance. Experimental results confirm the feasibility of the proposed scheme. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=Visible%20Light%20Communication%20%28VLC%29" title="Visible Light Communication (VLC)">Visible Light Communication (VLC)</a>, <a href="https://publications.waset.org/abstracts/search?q=Multiple-input%20and%20multiple-output%20%28MIMO%29" title=" Multiple-input and multiple-output (MIMO)"> Multiple-input and multiple-output (MIMO)</a>, <a href="https://publications.waset.org/abstracts/search?q=Red-Green-Blue%20%28RGB%29" title=" Red-Green-Blue (RGB)"> Red-Green-Blue (RGB)</a>, <a href="https://publications.waset.org/abstracts/search?q=Hadamard%20coding%20scheme" title=" Hadamard coding scheme"> Hadamard coding scheme</a> </p> <a href="https://publications.waset.org/abstracts/15442/hierarchical-scheme-for-detection-of-rotating-mimo-visible-light-communication-systems-using-mobile-phone-camera" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/15442.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">419</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2084</span> Performance Estimation of Two Port Multiple-Input and Multiple-Output Antenna for Wireless Local Area Network Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Radha%20Tomar">Radha Tomar</a>, <a href="https://publications.waset.org/abstracts/search?q=Satish%20K.%20Jain"> Satish K. Jain</a>, <a href="https://publications.waset.org/abstracts/search?q=Manish%20Panchal"> Manish Panchal</a>, <a href="https://publications.waset.org/abstracts/search?q=P.%20S.%20Rathore"> P. S. Rathore</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the presented work, inset fed microstrip patch antenna (IFMPA) based two port MIMO Antenna system has been proposed, which is suitable for wireless local area network (WLAN) applications. IFMPA has been designed, optimized for 2.4 GHz and applied for MIMO formation. The optimized parameters of the proposed IFMPA have been used for fabrication of antenna and two port MIMO in a laboratory. Fabrication of the designed MIMO antenna has been done and tested experimentally for performance parameters like Envelope Correlation Coefficient (ECC), Mean Effective Gain (MEG), Directive Gain (DG), Channel Capacity Loss (CCL), Multiplexing Efficiency (ME) etc and results are compared with simulated parameters extracted with simulated S parameters to validate the results. The simulated and experimentally measured plots and numerical values of these MIMO performance parameters resembles very much with each other. This shows the success of MIMO antenna design methodology. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=multiple-input%20and%20multiple-output" title="multiple-input and multiple-output">multiple-input and multiple-output</a>, <a href="https://publications.waset.org/abstracts/search?q=wireless%20local%20area%20network" title=" wireless local area network"> wireless local area network</a>, <a href="https://publications.waset.org/abstracts/search?q=vector%20network%20analyzer" title=" vector network analyzer"> vector network analyzer</a>, <a href="https://publications.waset.org/abstracts/search?q=envelope%20correlation%20coefficient" title=" envelope correlation coefficient"> envelope correlation coefficient</a> </p> <a href="https://publications.waset.org/abstracts/177821/performance-estimation-of-two-port-multiple-input-and-multiple-output-antenna-for-wireless-local-area-network-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/177821.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">55</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2083</span> Long Term Evolution Multiple-Input Multiple-Output Network in Unmanned Air Vehicles Platform</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Ashagrie%20Getnet%20Flattie">Ashagrie Getnet Flattie</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Line-of-sight (LOS) information, data rates, good quality, and flexible network service are limited by the fact that, for the duration of any given connection, they experience severe variation in signal strength due to fading and path loss. Wireless system faces major challenges in achieving wide coverage and capacity without affecting the system performance and to access data everywhere, all the time. In this paper, the cell coverage and edge rate of different Multiple-input multiple-output (MIMO) schemes in 20 MHz Long Term Evolution (LTE) system under Unmanned Air Vehicles (UAV) platform are investigated. After some background on the enormous potential of UAV, MIMO, and LTE in wireless links, the paper highlights the presented system model which attempts to realize the various benefits of MIMO being incorporated into UAV platform. The performances of the three MIMO LTE schemes are compared with the performance of 4x4 MIMO LTE in UAV scheme carried out to evaluate the improvement in cell radius, BER, and data throughput of the system in different morphology. The results show that significant performance gains such as bit error rate (BER), data rate, and coverage can be achieved by using the presented scenario. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=LTE" title="LTE">LTE</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=path%20loss" title=" path loss"> path loss</a>, <a href="https://publications.waset.org/abstracts/search?q=UAV" title=" UAV"> UAV</a> </p> <a href="https://publications.waset.org/abstracts/52706/long-term-evolution-multiple-input-multiple-output-network-in-unmanned-air-vehicles-platform" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52706.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">279</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2082</span> Interference Management in Long Term Evolution-Advanced System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Selma%20Sbit">Selma Sbit</a>, <a href="https://publications.waset.org/abstracts/search?q=Mohamed%20Bechir%20Dadi"> Mohamed Bechir Dadi</a>, <a href="https://publications.waset.org/abstracts/search?q=Belgacem%20Chibani%20Rhaimi"> Belgacem Chibani Rhaimi</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Incorporating Home eNodeB (HeNB) in cellular networks, e.g. Long Term Evolution Advanced (LTE-A), is beneficial for extending coverage and enhancing capacity at low price especially within the non-line-of sight (NLOS) environments such as homes. HeNB or femtocell is a small low powered base station which provides radio coverage to the mobile users in an indoor environment. This deployment results in a heterogeneous network where the available spectrum becomes shared between two layers. Therefore, a problem of Inter Cell Interference (ICI) appears. This issue is the main challenge in LTE-A. To deal with this challenge, various techniques based on frequency, time and power control are proposed. This paper deals with the impact of carrier aggregation and higher order MIMO (Multiple Input Multiple Output) schemes on the LTE-Advanced performance. Simulation results show the advantages of these schemes on the system capacity (4.10<sup>9 </sup>b/s/Hz when bandwidth B=100 MHz and when applying MIMO 8x8 for SINR=30 dB), maximum theoretical peak data rate (more than 4 Gbps for B=100 MHz and when MIMO 8x8 is used) and spectral efficiency (15 b/s/Hz and 30b/s/Hz when MIMO 4x4 and MIMO 8x8 are applying respectively for SINR=30 dB). <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=capacity" title="capacity">capacity</a>, <a href="https://publications.waset.org/abstracts/search?q=carrier%20aggregation" title=" carrier aggregation"> carrier aggregation</a>, <a href="https://publications.waset.org/abstracts/search?q=LTE-Advanced" title=" LTE-Advanced"> LTE-Advanced</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO%20%28Multiple%20Input%20Multiple%20Output%29" title=" MIMO (Multiple Input Multiple Output)"> MIMO (Multiple Input Multiple Output)</a>, <a href="https://publications.waset.org/abstracts/search?q=peak%20data%20rate" title=" peak data rate"> peak data rate</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20efficiency" title=" spectral efficiency"> spectral efficiency</a> </p> <a href="https://publications.waset.org/abstracts/77745/interference-management-in-long-term-evolution-advanced-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/77745.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">256</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2081</span> MIMO Radar-Based System for Structural Health Monitoring and Geophysical Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Davide%20D%E2%80%99Aria">Davide D’Aria</a>, <a href="https://publications.waset.org/abstracts/search?q=Paolo%20Falcone"> Paolo Falcone</a>, <a href="https://publications.waset.org/abstracts/search?q=Luigi%20Maggi"> Luigi Maggi</a>, <a href="https://publications.waset.org/abstracts/search?q=Aldo%20Cero"> Aldo Cero</a>, <a href="https://publications.waset.org/abstracts/search?q=Giovanni%20Amoroso"> Giovanni Amoroso</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The paper presents a methodology for real-time structural health monitoring and geophysical applications. The key elements of the system are a high performance MIMO RADAR sensor, an optical camera and a dedicated set of software algorithms encompassing interferometry, tomography and photogrammetry. The MIMO Radar sensor proposed in this work, provides an extremely high sensitivity to displacements making the system able to react to tiny deformations (up to tens of microns) with a time scale which spans from milliseconds to hours. The MIMO feature of the system makes the system capable of providing a set of two-dimensional images of the observed scene, each mapped on the azimuth-range directions with noticeably resolution in both the dimensions and with an outstanding repetition rate. The back-scattered energy, which is distributed in the 3D space, is projected on a 2D plane, where each pixel has as coordinates the Line-Of-Sight distance and the cross-range azimuthal angle. At the same time, the high performing processing unit allows to sense the observed scene with remarkable refresh periods (up to milliseconds), thus opening the way for combined static and dynamic structural health monitoring. Thanks to the smart TX/RX antenna array layout, the MIMO data can be processed through a tomographic approach to reconstruct the three-dimensional map of the observed scene. This 3D point cloud is then accurately mapped on a 2D digital optical image through photogrammetric techniques, allowing for easy and straightforward interpretations of the measurements. Once the three-dimensional image is reconstructed, a 'repeat-pass' interferometric approach is exploited to provide the user of the system with high frequency three-dimensional motion/vibration estimation of each point of the reconstructed image. At this stage, the methodology leverages consolidated atmospheric correction algorithms to provide reliable displacement and vibration measurements. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=interferometry" title="interferometry">interferometry</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO%20RADAR" title=" MIMO RADAR"> MIMO RADAR</a>, <a href="https://publications.waset.org/abstracts/search?q=SAR" title=" SAR"> SAR</a>, <a href="https://publications.waset.org/abstracts/search?q=tomography" title=" tomography"> tomography</a> </p> <a href="https://publications.waset.org/abstracts/108002/mimo-radar-based-system-for-structural-health-monitoring-and-geophysical-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/108002.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">195</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2080</span> Performance Evaluation of MIMO-OFDM Communication Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=M.%20I.%20Youssef">M. I. Youssef</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20E.%20Emam"> A. E. Emam</a>, <a href="https://publications.waset.org/abstracts/search?q=M.%20Abd%20Elghany"> M. Abd Elghany</a> </p> <p class="card-text"><strong>Abstract:</strong></p> This paper evaluates the bit error rate (BER) performance of MIMO-OFDM communication system. MIMO system uses multiple transmitting and receiving antennas with different coding techniques to either enhance the transmission diversity or spatial multiplexing gain. Utilizing alamouti algorithm were the same information transmitted over multiple antennas at different time intervals and then collected again at the receivers to minimize the probability of error, combat fading and thus improve the received signal to noise ratio. While utilizing V-BLAST algorithm, the transmitted signals are divided into different transmitting channels and transferred over the channel to be received by different receiving antennas to increase the transmitted data rate and achieve higher throughput. The paper provides a study of different diversity gain coding schemes and spatial multiplexing coding for MIMO systems. A comparison of various channels' estimation and equalization techniques are given. The simulation is implemented using MATLAB, and the results had shown the performance of transmission models under different channel environments. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MIMO%20communication" title="MIMO communication">MIMO communication</a>, <a href="https://publications.waset.org/abstracts/search?q=BER" title=" BER"> BER</a>, <a href="https://publications.waset.org/abstracts/search?q=space%20codes" title=" space codes"> space codes</a>, <a href="https://publications.waset.org/abstracts/search?q=channels" title=" channels"> channels</a>, <a href="https://publications.waset.org/abstracts/search?q=alamouti" title=" alamouti"> alamouti</a>, <a href="https://publications.waset.org/abstracts/search?q=V-BLAST" title=" V-BLAST"> V-BLAST</a> </p> <a href="https://publications.waset.org/abstracts/82337/performance-evaluation-of-mimo-ofdm-communication-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/82337.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">175</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2079</span> Performance Analysis of a Combined Ordered Successive and Interference Cancellation Using Zero-Forcing Detection over Rayleigh Fading Channels in Mimo Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jamal%20R.%20Elbergali">Jamal R. Elbergali</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Multiple Input Multiple Output (MIMO) systems are wireless systems with multiple antenna elements at both ends of the link. Wireless communication systems demand high data rate and spectral efficiency with increased reliability. MIMO systems have been popular techniques to achieve these goals because increased data rate is possible through spatial multiplexing scheme and diversity. Spatial Multiplexing (SM) is used to achieve higher possible throughput than diversity. In this paper, we propose a Zero-Forcing (ZF) detection using a combination of Ordered Successive Interference Cancellation (OSIC) and Zero Forcing using Interference Cancellation (ZF-IC). The proposed method used an OSIC based on Signal to Noise Ratio (SNR) ordering to get the estimation of last symbol (x ̃_(N_T )), then the estimated last symbol is considered to be an input to the ZF-IC. We analyze the Bit Error Rate (BER) performance of the proposed MIMO system over Rayleigh Fading Channel, using Binary Phase Shift Keying (BPSK) modulation scheme. The results show better performance than the previous methods. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=SNR" title="SNR">SNR</a>, <a href="https://publications.waset.org/abstracts/search?q=BER" title=" BER"> BER</a>, <a href="https://publications.waset.org/abstracts/search?q=BPSK" title=" BPSK"> BPSK</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=modulation" title=" modulation"> modulation</a>, <a href="https://publications.waset.org/abstracts/search?q=zero%20forcing%20%28ZF%29" title=" zero forcing (ZF)"> zero forcing (ZF)</a>, <a href="https://publications.waset.org/abstracts/search?q=OSIC" title=" OSIC"> OSIC</a>, <a href="https://publications.waset.org/abstracts/search?q=ZF-IC" title=" ZF-IC"> ZF-IC</a>, <a href="https://publications.waset.org/abstracts/search?q=spatial%20multiplexing%20%28SM%29" title=" spatial multiplexing (SM)"> spatial multiplexing (SM)</a> </p> <a href="https://publications.waset.org/abstracts/36113/performance-analysis-of-a-combined-ordered-successive-and-interference-cancellation-using-zero-forcing-detection-over-rayleigh-fading-channels-in-mimo-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/36113.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">423</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2078</span> Design of Transmit Beamspace and DOA Estimation in MIMO Radar</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=S.%20Ilakkiya">S. Ilakkiya</a>, <a href="https://publications.waset.org/abstracts/search?q=A.%20Merline"> A. Merline</a> </p> <p class="card-text"><strong>Abstract:</strong></p> A multiple-input multiple-output (MIMO) radar systems use modulated waveforms and directive antennas to transmit electromagnetic energy into a specific volume in space to search for targets. This paper deals with the design of transmit beamspace matrix and DOA estimation for multiple-input multiple-output (MIMO) radar with collocated antennas.The design of transmit beamspace matrix is based on minimizing the difference between a desired transmit beampattern and the actual one while enforcing the constraint of uniform power distribution across the transmit array elements. Rotational invariance property is established at the transmit array by imposing a specific structure on the beamspace matrix. Semidefinite programming and spatial-division based design (SDD) are also designed separately. In MIMO radar systems, DOA estimation is an essential process to determine the direction of incoming signals and thus to direct the beam of the antenna array towards the estimated direction. This estimation deals with non-adaptive spectral estimation and adaptive spectral estimation techniques. The design of the transmit beamspace matrix and spectral estimation techniques are studied through simulation. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=adaptive%20and%20non-adaptive%20spectral%20estimation" title="adaptive and non-adaptive spectral estimation">adaptive and non-adaptive spectral estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=direction%20of%20arrival%20estimation" title=" direction of arrival estimation"> direction of arrival estimation</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO%20radar" title=" MIMO radar"> MIMO radar</a>, <a href="https://publications.waset.org/abstracts/search?q=rotational%20invariance%20property" title=" rotational invariance property"> rotational invariance property</a>, <a href="https://publications.waset.org/abstracts/search?q=transmit" title=" transmit"> transmit</a>, <a href="https://publications.waset.org/abstracts/search?q=receive%20beamforming" title=" receive beamforming "> receive beamforming </a> </p> <a href="https://publications.waset.org/abstracts/30032/design-of-transmit-beamspace-and-doa-estimation-in-mimo-radar" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/30032.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">519</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2077</span> Performance Analysis in 5th Generation Massive Multiple-Input-Multiple-Output Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jihad%20S.%20Daba">Jihad S. Daba</a>, <a href="https://publications.waset.org/abstracts/search?q=Jean-Pierre%20Dubois"> Jean-Pierre Dubois</a>, <a href="https://publications.waset.org/abstracts/search?q=Georges%20El%20Soury"> Georges El Soury</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Fifth generation wireless networks guarantee significant capacity enhancement to suit more clients and services at higher information rates with better reliability while consuming less power. The deployment of massive multiple-input-multiple-output technology guarantees broadband wireless networks with the use of base station antenna arrays to serve a large number of users on the same frequency and time-slot channels. In this work, we evaluate the performance of massive multiple-input-multiple-output systems (MIMO) systems in 5<sup>th</sup> generation cellular networks in terms of capacity and bit error rate. Several cases were considered and analyzed to compare the performance of massive MIMO systems while varying the number of antennas at both transmitting and receiving ends. We found that, unlike classical MIMO systems, reducing the number of transmit antennas while increasing the number of antennas at the receiver end provides a better solution to performance enhancement. In addition, enhanced orthogonal frequency division multiplexing and beam division multiple access schemes further improve the performance of massive MIMO systems and make them more reliable. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=beam%20division%20multiple%20access" title="beam division multiple access">beam division multiple access</a>, <a href="https://publications.waset.org/abstracts/search?q=D2D%20communication" title=" D2D communication"> D2D communication</a>, <a href="https://publications.waset.org/abstracts/search?q=enhanced%20OFDM" title=" enhanced OFDM"> enhanced OFDM</a>, <a href="https://publications.waset.org/abstracts/search?q=fifth%20generation%20broadband" title=" fifth generation broadband"> fifth generation broadband</a>, <a href="https://publications.waset.org/abstracts/search?q=massive%20MIMO" title=" massive MIMO"> massive MIMO</a> </p> <a href="https://publications.waset.org/abstracts/96696/performance-analysis-in-5th-generation-massive-multiple-input-multiple-output-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/96696.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">258</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2076</span> An Intelligent Scheme Switching for MIMO Systems Using Fuzzy Logic Technique</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Robert%20O.%20Abolade">Robert O. Abolade</a>, <a href="https://publications.waset.org/abstracts/search?q=Olumide%20O.%20Ajayi"> Olumide O. Ajayi</a>, <a href="https://publications.waset.org/abstracts/search?q=Zacheaus%20K.%20Adeyemo"> Zacheaus K. Adeyemo</a>, <a href="https://publications.waset.org/abstracts/search?q=Solomon%20A.%20Adeniran"> Solomon A. Adeniran</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Link adaptation is an important strategy for achieving robust wireless multimedia communications based on quality of service (QoS) demand. Scheme switching in multiple-input multiple-output (MIMO) systems is an aspect of link adaptation, and it involves selecting among different MIMO transmission schemes or modes so as to adapt to the varying radio channel conditions for the purpose of achieving QoS delivery. However, finding the most appropriate switching method in MIMO links is still a challenge as existing methods are either computationally complex or not always accurate. This paper presents an intelligent switching method for the MIMO system consisting of two schemes - transmit diversity (TD) and spatial multiplexing (SM) - using fuzzy logic technique. In this method, two channel quality indicators (CQI) namely average received signal-to-noise ratio (RSNR) and received signal strength indicator (RSSI) are measured and are passed as inputs to the fuzzy logic system which then gives a decision – an inference. The switching decision of the fuzzy logic system is fed back to the transmitter to switch between the TD and SM schemes. Simulation results show that the proposed fuzzy logic – based switching technique outperforms conventional static switching technique in terms of bit error rate and spectral efficiency. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=channel%20quality%20indicator" title="channel quality indicator">channel quality indicator</a>, <a href="https://publications.waset.org/abstracts/search?q=fuzzy%20logic" title=" fuzzy logic"> fuzzy logic</a>, <a href="https://publications.waset.org/abstracts/search?q=link%20adaptation" title=" link adaptation"> link adaptation</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=spatial%20multiplexing" title=" spatial multiplexing"> spatial multiplexing</a>, <a href="https://publications.waset.org/abstracts/search?q=transmit%20diversity" title=" transmit diversity"> transmit diversity</a> </p> <a href="https://publications.waset.org/abstracts/99468/an-intelligent-scheme-switching-for-mimo-systems-using-fuzzy-logic-technique" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/99468.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">152</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2075</span> Linear MIMO Model Identification Using an Extended Kalman Filter</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Matthew%20C.%20Best">Matthew C. Best</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Linear Multi-Input Multi-Output (MIMO) dynamic models can be identified, with no a priori knowledge of model structure or order, using a new Generalised Identifying Filter (GIF). Based on an Extended Kalman Filter, the new filter identifies the model iteratively, in a continuous modal canonical form, using only input and output time histories. The filter’s self-propagating state error covariance matrix allows easy determination of convergence and conditioning, and by progressively increasing model order, the best fitting reduced-order model can be identified. The method is shown to be resistant to noise and can easily be extended to identification of smoothly nonlinear systems. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=system%20identification" title="system identification">system identification</a>, <a href="https://publications.waset.org/abstracts/search?q=Kalman%20filter" title=" Kalman filter"> Kalman filter</a>, <a href="https://publications.waset.org/abstracts/search?q=linear%20model" title=" linear model"> linear model</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO" title=" MIMO"> MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=model%20order%20reduction" title=" model order reduction"> model order reduction</a> </p> <a href="https://publications.waset.org/abstracts/24532/linear-mimo-model-identification-using-an-extended-kalman-filter" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/24532.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">594</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2074</span> Efficient Signal Detection Using QRD-M Based on Channel Condition in MIMO-OFDM System</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jae-Jeong%20Kim">Jae-Jeong Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Ki-Ro%20Kim"> Ki-Ro Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyoung-Kyu%20Song"> Hyoung-Kyu Song</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In this paper, we propose an efficient signal detector that switches M parameter of QRD-M detection scheme is proposed for MIMO-OFDM system. The proposed detection scheme calculates the threshold by 1-norm condition number and then switches M parameter of QRD-M detection scheme according to channel information. If channel condition is bad, the parameter M is set to high value to increase the accuracy of detection. If channel condition is good, the parameter M is set to low value to reduce complexity of detection. Therefore, the proposed detection scheme has better trade off between BER performance and complexity than the conventional detection scheme. The simulation result shows that the complexity of proposed detection scheme is lower than QRD-M detection scheme with similar BER performance. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=MIMO-OFDM" title="MIMO-OFDM">MIMO-OFDM</a>, <a href="https://publications.waset.org/abstracts/search?q=QRD-M" title=" QRD-M"> QRD-M</a>, <a href="https://publications.waset.org/abstracts/search?q=channel%20condition" title=" channel condition"> channel condition</a>, <a href="https://publications.waset.org/abstracts/search?q=BER" title=" BER"> BER</a> </p> <a href="https://publications.waset.org/abstracts/3518/efficient-signal-detection-using-qrd-m-based-on-channel-condition-in-mimo-ofdm-system" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/3518.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">370</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2073</span> The Primitive Code-Level Design Patterns for Distributed Programming</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Bing%20Li">Bing Li</a> </p> <p class="card-text"><strong>Abstract:</strong></p> The primitive code-level design patterns (PDP) are the rudimentary programming elements to develop any distributed systems in the generic distributed programming environment, GreatFree. The PDP works with the primitive distributed application programming interfaces (PDA), the distributed modeling, and the distributed concurrency for scaling-up. They not only hide developers from underlying technical details but also support sufficient adaptability to a variety of distributed computing environments. Programming with them, the simplest distributed system, the lightweight messaging two-node client/server (TNCS) system, is constructed rapidly with straightforward and repeatable behaviors, copy-paste-replace (CPR). As any distributed systems are made up of the simplest ones, those PDAs, as well as the PDP, are generic for distributed programming. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=primitive%20APIs" title="primitive APIs">primitive APIs</a>, <a href="https://publications.waset.org/abstracts/search?q=primitive%20code-level%20design%20patterns" title=" primitive code-level design patterns"> primitive code-level design patterns</a>, <a href="https://publications.waset.org/abstracts/search?q=generic%20distributed%20programming" title=" generic distributed programming"> generic distributed programming</a>, <a href="https://publications.waset.org/abstracts/search?q=distributed%20systems" title=" distributed systems"> distributed systems</a>, <a href="https://publications.waset.org/abstracts/search?q=highly%20patterned%20development%20environment" title=" highly patterned development environment"> highly patterned development environment</a>, <a href="https://publications.waset.org/abstracts/search?q=messaging" title=" messaging"> messaging</a> </p> <a href="https://publications.waset.org/abstracts/135687/the-primitive-code-level-design-patterns-for-distributed-programming" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/135687.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">191</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2072</span> Isolation Enhancement of Compact Dual-Band Printed Multiple Input Multiple Output Antenna for WLAN Applications</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Adham%20M.%20Salah">Adham M. Salah</a>, <a href="https://publications.waset.org/abstracts/search?q=Tariq%20A.%20Nagem"> Tariq A. Nagem</a>, <a href="https://publications.waset.org/abstracts/search?q=Raed%20A.%20Abd-Alhameed"> Raed A. Abd-Alhameed</a>, <a href="https://publications.waset.org/abstracts/search?q=James%20M.%20Noras"> James M. Noras</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Recently, the demand for wireless communications systems to cover more than one frequency band (multi-band) with high data rate has been increased for both fixed and mobile services. Multiple Input Multiple Output (MIMO) technology is one of the significant solutions for attaining these requirements and to achieve the maximum channel capacity of the wireless communications systems. The main issue associated with MIMO antennas especially in portable devices is the compact space between the radiating elements which leads to limit the physical separation between them. This issue exacerbates the performance of the MIMO antennas by increasing the mutual coupling between the radiating elements. In other words, the mutual coupling will be stronger if the radiating elements of the MIMO antenna are closer. This paper presents a low–profile dual-band (2×1) MIMO antenna that works at 2.4GHz, 5.3GHz and 5.8GHz for wireless local area networks (WLAN) applications. A neutralization line (NL) technique for enhancing the isolation has been used by introducing a strip line with a length of λg/4 at the isolation frequency (2.4GHz) between the radiating elements. The overall dimensions of the antenna are 33.5 x 36 x 1.6 mm³. The fabricated prototype shows a good agreement between the simulated and measured results. The antenna impedance bandwidths are 2.38–2.75 GHz and 4.4–6 GHz for the lower and upper band respectively; the reflection coefficient and mutual coupling are better than -25 dB in both lower and higher bands. The MIMO antenna performance characteristics are reported in terms of the scattering parameters, envelope correlation coefficient (ECC), total active reflection coefficient, capacity loss, antenna gain, and radiation patterns. Analysis of these characteristics indicates that the design is appropriate for the WLAN terminal applications. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=ECC" title="ECC">ECC</a>, <a href="https://publications.waset.org/abstracts/search?q=neutralization%20line" title=" neutralization line"> neutralization line</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO%20antenna" title=" MIMO antenna"> MIMO antenna</a>, <a href="https://publications.waset.org/abstracts/search?q=multi-band" title=" multi-band"> multi-band</a>, <a href="https://publications.waset.org/abstracts/search?q=mutual%20coupling" title=" mutual coupling"> mutual coupling</a>, <a href="https://publications.waset.org/abstracts/search?q=WLAN" title=" WLAN"> WLAN</a> </p> <a href="https://publications.waset.org/abstracts/105683/isolation-enhancement-of-compact-dual-band-printed-multiple-input-multiple-output-antenna-for-wlan-applications" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/105683.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">133</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2071</span> Coordinated Interference Canceling Algorithm for Uplink Massive Multiple Input Multiple Output Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Messaoud%20Eljamai">Messaoud Eljamai</a>, <a href="https://publications.waset.org/abstracts/search?q=Sami%20Hidouri"> Sami Hidouri</a> </p> <p class="card-text"><strong>Abstract:</strong></p> Massive multiple-input multiple-output (MIMO) is an emerging technology for new cellular networks such as 5G systems. Its principle is to use many antennas per cell in order to maximize the network's spectral efficiency. Inter-cellular interference remains a fundamental problem. The use of massive MIMO will not derogate from the rule. It improves performances only when the number of antennas is significantly greater than the number of users. This, considerably, limits the networks spectral efficiency. In this paper, a coordinated detector for an uplink massive MIMO system is proposed in order to mitigate the inter-cellular interference. The proposed scheme combines the coordinated multipoint technique with an interference-cancelling algorithm. It requires the serving cell to send their received symbols, after processing, decision and error detection, to the interfered cells via a backhaul link. Each interfered cell is capable of eliminating intercellular interferences by generating and subtracting the user’s contribution from the received signal. The resulting signal is more reliable than the original received signal. This allows the uplink massive MIMO system to improve their performances dramatically. Simulation results show that the proposed detector improves system spectral efficiency compared to classical linear detectors. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=massive%20MIMO" title="massive MIMO">massive MIMO</a>, <a href="https://publications.waset.org/abstracts/search?q=COMP" title=" COMP"> COMP</a>, <a href="https://publications.waset.org/abstracts/search?q=interference%20canceling%20algorithm" title=" interference canceling algorithm"> interference canceling algorithm</a>, <a href="https://publications.waset.org/abstracts/search?q=spectral%20efficiency" title=" spectral efficiency"> spectral efficiency</a> </p> <a href="https://publications.waset.org/abstracts/110787/coordinated-interference-canceling-algorithm-for-uplink-massive-multiple-input-multiple-output-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/110787.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">147</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2070</span> Variable Tree Structure QR Decomposition-M Algorithm (QRD-M) in Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing (MIMO-OFDM) Systems</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Jae-Hyun%20Ro">Jae-Hyun Ro</a>, <a href="https://publications.waset.org/abstracts/search?q=Jong-Kwang%20Kim"> Jong-Kwang Kim</a>, <a href="https://publications.waset.org/abstracts/search?q=Chang-Hee%20Kang"> Chang-Hee Kang</a>, <a href="https://publications.waset.org/abstracts/search?q=Hyoung-Kyu%20Song"> Hyoung-Kyu Song</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In multiple input multiple output-orthogonal frequency division multiplexing (MIMO-OFDM) systems, QR decomposition-M algorithm (QRD-M) has suboptimal error performance. However, the QRD-M has still high complexity due to many calculations at each layer in tree structure. To reduce the complexity of the QRD-M, proposed QRD-M modifies existing tree structure by eliminating unnecessary candidates at almost whole layers. The method of the elimination is discarding the candidates which have accumulated squared Euclidean distances larger than calculated threshold. The simulation results show that the proposed QRD-M has same bit error rate (BER) performance with lower complexity than the conventional QRD-M. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=complexity" title="complexity">complexity</a>, <a href="https://publications.waset.org/abstracts/search?q=MIMO-OFDM" title=" MIMO-OFDM"> MIMO-OFDM</a>, <a href="https://publications.waset.org/abstracts/search?q=QRD-M" title=" QRD-M"> QRD-M</a>, <a href="https://publications.waset.org/abstracts/search?q=squared%20Euclidean%20distance" title=" squared Euclidean distance"> squared Euclidean distance</a> </p> <a href="https://publications.waset.org/abstracts/52299/variable-tree-structure-qr-decomposition-m-algorithm-qrd-m-in-multiple-input-multiple-output-orthogonal-frequency-division-multiplexing-mimo-ofdm-systems" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/52299.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">332</span> </span> </div> </div> <div class="card paper-listing mb-3 mt-3"> <h5 class="card-header" style="font-size:.9rem"><span class="badge badge-info">2069</span> A Survey on Concurrency Control Methods in Distributed Database</h5> <div class="card-body"> <p class="card-text"><strong>Authors:</strong> <a href="https://publications.waset.org/abstracts/search?q=Seyed%20Mohsen%20Jameii">Seyed Mohsen Jameii</a> </p> <p class="card-text"><strong>Abstract:</strong></p> In the last years, remarkable improvements have been made in the ability of distributed database systems performance. A distributed database is composed of some sites which are connected to each other through network connections. In this system, if good harmonization is not made between different transactions, it may result in database incoherence. Nowadays, because of the complexity of many sites and their connection methods, it is difficult to extend different models in distributed database serially. The principle goal of concurrency control in distributed database is to ensure not interfering in accessibility of common database by different sites. Different concurrency control algorithms have been suggested to use in distributed database systems. In this paper, some available methods have been introduced and compared for concurrency control in distributed database. <p class="card-text"><strong>Keywords:</strong> <a href="https://publications.waset.org/abstracts/search?q=distributed%20database" title="distributed database">distributed database</a>, <a href="https://publications.waset.org/abstracts/search?q=two%20phase%20locking%20protocol" title=" two phase locking protocol"> two phase locking protocol</a>, <a href="https://publications.waset.org/abstracts/search?q=transaction" title=" transaction"> transaction</a>, <a href="https://publications.waset.org/abstracts/search?q=concurrency" title=" concurrency"> concurrency</a> </p> <a href="https://publications.waset.org/abstracts/69917/a-survey-on-concurrency-control-methods-in-distributed-database" class="btn btn-primary btn-sm">Procedia</a> <a href="https://publications.waset.org/abstracts/69917.pdf" target="_blank" class="btn btn-primary btn-sm">PDF</a> <span class="bg-info text-light px-1 py-1 float-right rounded"> Downloads <span class="badge badge-light">352</span> </span> </div> </div> <ul class="pagination"> <li class="page-item disabled"><span class="page-link">&lsaquo;</span></li> <li class="page-item active"><span class="page-link">1</span></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO&page=2">2</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO&page=3">3</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO&page=4">4</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO&page=5">5</a></li> <li class="page-item"><a class="page-link" href="https://publications.waset.org/abstracts/search?q=distributed%20MIMO&page=6">6</a></li> <li class="page-item"><a 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