高性能的MIMO-OFDM接收机IQ不平衡补偿新算法  

A high performance IQ imbalance compensation method for MIMO-OFDM receiver

作　　者：刘元[1] 彭端[2] 尹长川[3] 

机构地区：[1]广东工业大学信息工程学院,广东广州510006 [2]广东工业大学实验教学部,广东广州510006 [3]北京邮电大学电信工程学院,北京100876

出　　处：《电路与系统学报》2009年第2期90-94,共5页Journal of Circuits and Systems

基　　金：国家自然科学基金项目(60672123;60472070);广州市应用基础研究项目(2006J1-C0331);广东工业大学博士基金项目(073016)

摘　　要：在分析MIMO-OFDM接收机IQ不平衡信号模型基础上,以OFDM物理层为背景提出了一种新的时频结合的MIMO-OFDM接收机IQ不平衡补偿算法,即先在时域对IQ不平衡预补偿,然后在频域对残余的IQ不平衡进行校正。仿真结果表明:本文所提算法性能优于传统的频域补偿算法,该算法在AWGN信道下能达到理想性能,在多径衰落信道下当误比特率等于10-3时性能损失可以减小到0.5dB左右。Based on analyzing MIMO-OFDM receiver signal model in the presence of IQ imbalance, a novel combined time and frequency domains IQ imbalance compensation algorithm under the background of OFDM physical layer is proposed. The algorithm pre-compensates IQ imbalance in time domain, then corrects the residual IQ imbalance in frequency domain. Simulation results show that the proposed algorithm is superior to the conventional frequency domain compensation algorithms, the proposed algorithm can achieve the optimal performance in AWGN channel, and can reduce the performance degradation to about 0.5dB when the bit error rate is 10^-3 in multipath fading channel.

关 键 词：MIMO-OFDM IQ不平衡 无线局域网 

分 类 号：TN929[电子电信—通信与信息系统]