TDD-MIMO系统中由I/Q不平衡引起的信道非互易性补偿方法  

Compensation for channel non-reciprocity caused by I/Q imbalance in TDD-MIMO systems

作　　者：孙德春[1] 张霏霏[1] 刘祖军[1] 易克初[1] 

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《通信学报》2011年第3期79-85,共7页Journal on Communications

基　　金：高等学校学科创新引智计划(B08038);国家科技重大专项(2009zx03003-001-02)~~

摘　　要：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。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 re-spectively.Simulation results show that the proposed algorithm can effectively compensate I/Q imbalance,regain the channel reciprocity,and hence eliminate the system capacity loss.

关 键 词：TDD-MIMO I/Q不平衡 信道互易性 系统容量 

分 类 号：TN929.5[电子电信—通信与信息系统]