一种数字矢量调制幅相误差的校正方法

在使用数字矢量调制对基带信号进行瞬时带宽拓展时,由于I/Q通道的非理想性,不可避免的会引入幅相误差,从而产生镜频信号,使得发射机输出信号频谱纯度降低,难以达到接收机对信号进行识别的要求。为了达到工程上的要求,需要对幅相误差进行校正。文中首先测量出系统的幅相误差,再设计出补偿相位的全通滤波器和补偿幅度的低通滤波器。实验结果表明,此校正方法能有效地提高发射机的镜像抑制比,改善输出信号的质量。

A Calibrated Method of Magnitude and Phase Errors in Digital Vector Modulation

In the use of digital vector modulation technology in broadening the instantaneous bandwidth of baseband signal,it's inevitable to generate mirror signal due to magnitude and phase errors introduced by the nonideal characteristic of I/Q channel,thus the spectrum purity of output signal is deteriorated dramatically,and it is difficult for the receiver to recognize the signal.In order to match the engineering requirement,it is necessary to calibrate the magnitude and phase errors.In this paper,the magnitude a...