Abstract
为了解决大规模MIMO系统中由于导频污染引起的严重的小区间干扰，对大规模MIMO系统中的干扰抑制合并(IRC)技术进行研究。该技术可利用小区间干扰和信道估计的相关性来抑制干扰。在非理想信道状态信息(CSI)情况下，分别分析了基站天线数、功率收缩因子和干扰因子对IRC方法系统性能的影响，并和最大比合并(MRC)和最小均方误差(MMSE)方法进行仿真对比。仿真结果表明，IRC系统性能明显优于MRC和MMSE，并且在基站天线数低于500时，功率收缩因子可以大于1/2。 In order to solve the serious inter-cell interference caused by the pilot contamination in massive MIMO, the interference rejection combining (IRC) technique is studied. The IRC technique can exploit the correlation between channel estimates and interference to suppress interference. In the case with imperfect channel state information (CSI), the IRC system performance is separately analyzed in the regimes of different numbers of base station (BS) antennas, power scaling factors and interference factors, and simulation comparison with maximum ratio combining (MRC) and minimum mean-square-error (MMSE) methods is made. Simulation results show that IRC has obviously better performance than MMSE and MRC, and the power scaling factor can be greater than 1/2 when the number of BS antennas is less than 500.
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