大规模MIMO上行系统中的等增益合并技术

Equal Gain Combining Technique for Massive MIMO Uplink Systems

在非完美和完美信道状态信息(CSI)两种情况下,对多小区大规模多输入多输出(MIMO)上行系统进行分析,推导了等增益合并(EGC)方案的可达速率表达式,并与最大比合并(MRC)方案进行比较.仿真结果表明,所推导的EGC闭合表达式与蒙特卡洛仿真结果相吻合;在非完美CSI且功率收缩因子为0.5的情况和完美CSI且功率收缩因子为1的情况下,随着天线数不断增加,EGC方案的频谱效率不断增加,并逐渐趋近于一个定值,说明了大规模MIMO中的EGC方案如MRC方案一样也具有有效节约能量的特点.

The uplink scenario of multi-cell massive maltiple input maltiple output with perfect and imperfect channel state information（CSI） is analyzed. The achievable rate of equal gain combining（EGC）scheme is deduced and compared with that of maximal-ratio combining（MRC） scheme. Simulation results show that the deduced EGC closed-form expression agrees well with Monte Carlo simulation results.In the two cases of imperfect CSI with the power scaling factor of 0. 5 and perfect CSI with the power scaling factor of 1,as the number of antennas increases,the spectral efficiency of EGC scheme increases and gradually approaches to a fixed value. This implies that the EGC scheme in massive MIMO also has such a characteristic of efficient saving energy like the MRC scheme.