基于LS的OFDM零中频接收机IQ不平衡数字补偿技术  

I/Q imbalance digital compensation based LS method for OFDM zero IF receivers

作　　者：张浩[1] 叶梧[1] 冯穗力[1] 童调生[2] 

机构地区：[1]华南理工大学电子与信息工程学院,广东广州510640 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电路与系统学报》2005年第2期91-94,共4页Journal of Circuits and Systems

基　　金：国家自然科学资金资助项目(60272051);广东自然科学基金资助项目(31391)

摘　　要：零中频接收机已成为未来无线终端发展潮流,但是零中频的结构会引入较大的射频损伤;本文首先介绍了射频I/Q不平衡时对高斯以及频率选择性信道下OFDM接收机性能的影响;通过特殊导频设计,解耦合I、Q路的相互影响;如此可以方便地估计和补偿射频I/Q不平衡对高斯以及频率选择性信道的影响。仿真表明本文所示方法大大提高了OFDM零中频接收机的性能。Zero IF receiver becomes the trends about the wireless terminals. However, zero IF architecture suffers from greater RF impairment. The paper introduces the effect of I/Q imbalance about OFDM receiver in AWGN and frequency selective fading channel firstly; And through the particular pilot structure, the interaction of I and Q paths is decomposed; Thus, the effect of I/Q imbalance is estimated and compensated in AWGN and frequency selective fading channel conveniently. The simulation results show that the above method greatly improves the performance of the zero IF OFDM receiver.

关 键 词：零中频 导频 I/Q不平衡 信道估计 

分 类 号：TN911.23[电子电信—通信与信息系统]