一种补偿低中频接收机I/Q不平衡的方法  

A Compensation Method for I/Q Imbalance of Low-IF Receiver

作　　者：郗蕴天 陈春[1] 

机构地区：[1]西安电子工程研究所,陕西西安710100

出　　处：《雷达科学与技术》2015年第6期604-608,共5页Radar Science and Technology

摘　　要：相对于传统的超外差接收机,低中频接收机的一个优点就是采用I/Q下变频替代固定的镜像抑制滤波器来实现对镜像信号的抑制,因而具有集成度高、灵活性强和成本低的优点。然而,I/Q不平衡会导致低中频接收机对镜像信号抑制不充分,一般需要采用额外的数字信号处理技术来提高镜像抑制能力。文章提出了一种利用理想的中频信号的圆卷积特性,基于广义线性估计技术盲补偿I/Q不平衡的方法。理论分析和仿真结果表明这种方法能够有效地实现I/Q不平衡的补偿。Compared with super-heterodyne architecture,one of the advantages of the low-IF receiver is that the image rejection is realized by I/Q signal processing instead of a fixed analog filter,which makes it have high integration,flexibility,and low cost.However,unavoidable I/Q imbalance lead to insufficient image rejection that must be enhanced by using additional digital signal processing.This paper proposes a blind I/Q imbalance compensation scheme based on generalized linear estimation technique,utilizing circular convolution property of the ideal IF signal.Theoretical analysis and simulation results show that it can efficiently compensate for I/Q imbalance.

关 键 词：广义线性估计 I/Q不平衡 圆卷积特性 I/Q不平衡的补偿 低中频接收机 

分 类 号：TN957.5[电子电信—信号与信息处理]