一种新型宽带接收机I/Q通道失配的数字校正方法  

A Novel Digital Calibration of I/Q bi-Channel Mismatch in Wideband Receiver

作　　者：卢刚[1] 吕幼新[1] 

机构地区：[1]电子科技大学电子工程学院,成都610054

出　　处：《信号处理》2006年第5期690-693,共4页Journal of Signal Processing

摘　　要：由于各种因素的影响,I/Q通道之间通常会发生失配现象,这会降低接收机的动态范围,进而影响接收机的性能。本文提出了一种宽带接收机中L/Q幅相误差校正的数字方法：首先通过一种时域方法以获得误差信息,籍此计算校正所需参数,再由Newton插值多项式构造滤波器组对I/Q信号进行滤波校正。仿真表明,这种数字校正方法能有效地提高宽带接收机I/Q通道的正交一致性。I/Q mismatch generated generally due to diversified factors. These mismatches will limit the dynamic range of a receiver,and weaken receiver＇ s performance. This paper proposes a digital calibration method to wideband receiver. First,the I/Q mismatch errors are estimated by local test signal injection. Second, a set of digital filters based on Newton interpolation polynomial is constructed to calibrate them. The simulation demonstrates the effect of this method.

关 键 词：正交 I/Q失配 镜像抑制度 增益误差 相位误差 直流偏置 

分 类 号：TN971.1[电子电信—信号与信息处理]