一种新型宽带接收机I/Q通道失配的数字校正方法

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。

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

I/Q mismatch generated generally due to diversified factors.These mismatches will limit the dynamic range of a receiv- er,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.