中频采样的原理及其应用

The Principles and Applications of IF Sampling

介绍了用直接中频信号采样方法实现正交相干检波的基本原理,分析并总结了到目前为止已知的几种中频采样的具体方法。此外,根据最小均方根准则(LMS)设计了中频采样FIR滤波器。最后给出了该中频采样数字滤波器在系统中的应用。

The principles of realizing quadrature coherent detection by direct sam pling of Intermedi-ate Frequency(IF)signals are introduced in this paper.Several concrete methods put up so f ar are ana-lyzed and summarized.Furthermore,an IF sampling FIR filter is designed according to LMS rule.An appli-cation combining the digital filter with STEL -2105in IF sampling and quadrature coherent detection in a practical system is given.