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| 1 | Cross-layer design for cooperative MIMO systems with relay selection and imperfect CSI显示文摘Based on imperfect channel state information (CSI) and relay selection, a cross-layer optimization scheme is developed for cooperative MIMO system, and the corresponding system performance is investigated in Rayleigh fading channel. By the theoretical analysis and mathematical manipulation, the average spectral efficiency (SE), packet error rate (PER) and packet loss rate (PLR) are derived. As a result, closed-form expressions of the average SE, PER and PLR are obtained, respectively. According to these, a cross-layer design (CLD) scheme subject to the average PER constraints is proposed to avoid the SE performance loss caused by the conventional instantaneous PER constraints. The scheme optimizes the adaptive thresholds by maximizing the average SE of the system, and an iteration method joint the Lagrange multiplier and Newton methods is presented to solve the above optimization problem. Simulation results verify the validity of the theoretical analysis. The results show that the proposed CLD scheme can improve the SE while target PLR is maintained. The CLD scheme under average PER constraints has higher SE than the conventional CLD scheme under instantaneous PER constraints. | YU XiangBin ZHOU TingTing RUI Yun YIN Xin CHEN Ming | 2013 | Science China(Information Sciences)2013，56，2： | 2 |
| 2 | Performance of orthogonal STBC-MIMO with variable-power adaptive modulation and delayed feedback in Nakagami fading channels显示文摘A variable-power(VP)adaptive modulation(AM)scheme with space-time block code(STBC)is developed in MIMO systems,and the corresponding performance is investigated in Nakagami fading channels.The optimum switching thresholds are derived so that the spectrum efciency(SE)under an average power and a target bit error rate(BER)constraint is maximized.By the switching thresholds,average BER and SE are further derived.As a result,closed-form expressions are obtained.Besides,the exact and approximate BER expressions of VP AM and constant-power(CP)AM systems with delayed feedback are respectively derived.Simulation results show that the theoretical SE and BER can match the corresponding simulation well.The results indicate that VP-AM with STBC provide higher spectrum efciency than the CP counterparts,and has slighter bite error rate performance degradation when the normalized delay is less than 0.01. | YU XiangBin CHEN XiaoMin BI GuangGuo RUI Yun | 2013 | Science China(Information Sciences)2013，56，10： | 2 |
| 3 | Performance of Cross-Layer Design with Power Allocation in Space-Time Coded MIMO Systems显示文摘A cross-layer design(CLD)scheme with combination of power allocation,adaptive modulation(AM)and automatic repeat request(ARQ)is presented for space-time coded MIMO system under imperfect feedback,and the corresponding system performance is investigated in a Rayleigh fading channel.Based on imperfect feedback information,a suboptimal power allocation(PA)scheme is derived to maximize the average spectral efficiency(SE)of the system.The scheme is based on a so-called compressed SNR criterion,and has a closed-form expression for positive power allocation,thus being computationally efficient.Moreover,it can improve SE of the presented CLD.Besides,due to better approximation,it obtains the performance close to the existing optimal approach which requires numerical search.Simulation results show that the proposed CLD with PA can achieve higher SE than the conventional CLD with equal power allocation scheme,and has almost the same performance as CLD with optimal PA.However,it has lower calculation complexity. | 杨定礼 刘岩 虞湘宾 | 2014 | Transactions of Nanjing University of Aeronautics and Astronautics2014，31，4： | 0 |
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