超宽带信号正交解调误差的分析及校正

The Analysis and Correction of Quadrature Demodulation Errors of Ultra Wide Band Signal

在超宽带相参接收系统中，正交解调的 Ｉ、 Ｑ 两路输出的幅度和相位的不一致性以及直流偏置分量会严重影响系统的性能。本文就超宽带信号的正交解调误差对信号处理的影响进行了分析，提出了一种幅相特性不一致的校正方法，并给出了计算机仿真的结果。

In the receiving system of Ultra Wide Band (UWB) coherent receiver, the amplitude and phase unbalances and DC offsets of in phase and quadrature channels might affect the performance of the system. In this paper, the affection of imbalances and DC offsets of I/Q demodulators to signal processing are analyzed. One method of calibrating of amplitude and phase imbalances is introduced and the result of computer simulation is given.