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针对时分双工(TDD,Time Division Duplex)多天线系统的下行传输,研究了以能量效率(EE,Energy Efficiency)最大为准则的上行训练设计问题.证明了存在信道估计误差时系统EE和频谱效率(SE,Spectrum Efficiency)上界是上行训练长度的凹函数,分析了信噪比和电路功耗等因素对两种准则下最优训练长度的影响.分析和仿真结果表明,当信噪比很高时,基于EE最优的设计将退化成基于SE最优的设计;而一般情况下,与最大化SE的训练设计相比,最大化EE要求系统配置更长的训练.
Aiming at the downlink transmission of time-division duplex (TDD) multi-antenna system, the uplink training design problem based on maximum energy efficiency (EE, Energy Efficiency) is studied. It is proved that the system EE and spectrum efficiency in the presence of channel estimation error (SE, Spectrum Efficiency) The upper bound is the concave function of the uplink training length, and the influence of SNR and power consumption on the optimal training length under the two criteria is analyzed.The simulation and simulation results show that when the SNR is very high High, the EE-optimal design will degenerate into a SE-optimized design; whereas, in general, maximizing EE requires that the system be configured for longer training than a training design that maximizes the SE.