直接序列扩谱通信中的窄带干扰抑制

Narrowband Interference Suppression in Direct Sequence Spread Spectrum Systems

对直接序列扩谱信号预处理可以大幅度提高扩谱通信系统抗窄带干扰的能力。近年来对这方面的研究,从线性处理方法到非线性处理方法,到多用户检测方法;从简单自适应,到盲信号处理等,出现了许多好的思路,并一步步改善了扩谱系统抗多种窄带干扰的能力。文章综述了这方面的研究成果,对各种方法进行了分析和评价,重点讨论非线性方法以及码辅助方法,其中,非线性方法讨论的重点是基于隐马尔可夫链的非线性处理方法。

For a direct sequence spectrum spread （DSSS） communication system, its ability to suppress narrow-band-interferences （NBI） can be substantially enhanced through pre-processing the received signals During the recent years, many good ideas have come forth, from linear processing to nonlinear processing as well as muhiuser detection, from simple adaptive algorithms to blindly adaptive ones, etc. , which remarkably improve the capability of DSSS systems to suppress NBI. This paper summarizes these achievements and reviews most methods in this area, with emphasis on nonlinear techniques and code-aided techniques. Among nonlinear methods, the Hidden Markov Model is stressed.