低轨卫星扩频通信中干扰信号的优化控制  

Researchon Narrow-Band Interference Suppression Technology in Satellite Spread Spectrum Communication Systems

作　　者：那顺巴雅尔[1,2,3] 刘会杰[1,2] 梁旭文[1,2] 

机构地区：[1]上海微小卫星工程中心,上海200050 [2]中国科学院上海微系统与信息技术研究所,上海200050 [3]中国科学院研究生院,北京100039

出　　处：《计算机仿真》2011年第3期86-90,共5页Computer Simulation

基　　金：上海市自然科学基金(10ZR1429100)

摘　　要：在低轨卫星扩频通信系统的研究中,存在人为的或者随机的窄带干扰信号。针对窄带干扰会严重影响卫星扩频系统的正常通信,为保证在一定功率干扰下通信系统的正常工作,采用准确干扰识别技术和干扰消除技术对抗窄带干扰,采用无失真的变换算法是研究了窄带干扰抑制技术的主要手段,包括时域和变换域算法。提出了一种基于快速ELT变换的稳健窄带干扰抑制技术,在变换域实现对干扰信号的识别与滤除,并进行了仿真。仿真结果表明快速ELT算法的抗窄带干扰技术可有效地识别并滤除窄带干扰,明显降低系统的误码率。There are hostile or random interferences in LEO satellite spread spectrum communication systems.LEO satellite spread spectrum communication system can not communicate normally and decode correctly if strong interferences are mixed in spread spectrum signals.The precise identification for interferences is important to interference removing to make the system work properly with strong interferences.Transform with perfect reconstruction is the key and the difficult part in this method.This paper researched on main methods to suppress NBI,including time-domain and transform domain algorithms.Proposed a robust method of NBI rejection based on ELT,removed interferences in transform domain and reconstructed original signals without distortion.The simulation result shows that the method based on Fast ELT algorithm for narrowband interference suppression can identify and remove interferences effectively,and BER has been reduced evidently.

关 键 词：窄带干扰 直接序列扩频 扩展重叠变换 快速傅立叶变换 

分 类 号：TN927.23[电子电信—通信与信息系统]