莱斯信道下具有硬件损伤的多对双向大规模MIMO AF中继系统及性能分析

摘要

This paper investigates the spectral efficiency (SE) and energy efficiency (EE) of a multi-pair two-way massive MIMO amplify-and-forward (MM-AF) relay system over Rician fading channels,where multiple user-pairs exchange information within pair through a relay with very large number of antennas.Firstly,the effect of hardware impairments on multipair two-way MM-AF system is taken into consideration and is modeled using transmit and receive distortion noises.Then,the zero-forcing reception/zero-forcing transmission (ZFR/ZFT) processing matrices of half-duplex relaying (HDR) and full-duplex relaying (FDR) are presented.Finally,the asymptotic expressions of the end to-end SINR are derived.Theoretical analyses and simulation results show that,the SE and EE of multi-pair FDR outperform that of the multi-pair HDR for the large relay antennas scenario.And as the signal-to-noise ratio (SNR) increases,the SE increases and saturates to a constant value.Moreover,when the number of relay antennas grows very large,the SE of MM-AF relay system is limited by the hardware impairments at the users instead of that at the relay or other interferences.%本文研究了莱斯信道条件下具有硬件损伤的多对双向大规模多输入多输出放大转发(massive MIMO amplify-and-forward,MM-AF)中继系统,多对用户通过配置有大规模天线阵列的中继实现用户对内的信息交换,并分析了其频谱效率和能量效率.首先,考虑了硬件损伤对多对双向MM-AF中继系统性能的影响,并将其建模为发送和接收失真噪声.然后,给出了半双工中继(half-duplex relaying,HDR)和全双工中继(full-duplex relaying, FDR)模式下的迫零发送/迫零接收处理矩阵.最后,分别给出了两种模式下的信干噪比渐近表达式.理论分析和仿真结果表明,在中继天线数较大情况下FDR的频谱和能量效率优于HDR;随着信噪比的增加,两种模式下系统的频谱效率先增大后收敛于一个固定值;当中继天线数较大时,系统的频谱效率主要受限于用户处的硬件损伤而非中继处或其他干扰.