TDD-MIMO系统中由I/Q不平衡引起的信道非互易性补偿方法

摘要

The bad effect of channel non-reciprocity on system capacity was analyzed and a calibration algorithm was proposed for compensation. By link measurement, BS and MS get the channel state information (CSI) of uplink and downlink channels. Then the CSI was gathered by BS to figure out the calibration matrices to be used by BS and MS respectively. Simulation results show that the proposed algorithm can effectively compensate I/Q imbalance, regain the channel reciprocity, and hence eliminate the system capacity loss.%分析了I/Q不平衡引起的信道互易性丧失对系统容量的影响,提出了一种基于信道状态测量的补偿算法.该算法中基站(BS)和移动台(MS)各自对接收信道进行测量而得到上下行链路的信道状态信息(CSI),然后将2条链路的CSI汇集到BS处,BS计算出分别用于BS和MS的校准矩阵.仿真结果表明所提算法能够有效地对I/Q不平衡进行校准,使信道互易性得到保持,从而使系统容量的损失得以弥补.