干扰抑制技术辅助的直扩系统抗窄带干扰特性研究  

Research on Narrow Band Interference Resistance of DSSS System Assisted by Interference Suppression Technology

作　　者：孟向阳 刘明洋 王晓婷[2] MENG Xiangyang;LIU Mingyang;WANG Xiaoting(China Academy of Space Technology (Xi’an),Xi’an 710000,China;Beijing Institute of Tracking and Communication Technology,Beijing 100094,China)

机构地区：[1]中国空间技术研究院西安分院,西安710000 [2]北京跟踪与通信技术研究所,北京100094

出　　处：《空间电子技术》2019年第4期44-49,共6页Space Electronic Technology

摘　　要：为探索有干扰抑制技术辅助时,直扩系统抗干扰特性的新变化,文章通过蒙特卡罗仿真的方式,研究了在不同干扰带宽占比和干扰强度下,时域、频域两类干扰抑制技术的误码率性能。首先给出了窄带干扰条件下无干扰抑制技术辅助的直扩系统误码率估算方法;然后,简要介绍了时域归一化LMS(NLMS)干扰抑制技术和基于FFT变换的频域干扰抑制技术的算法原理以及工程实现方案,详细仿真比较了二者在不同干扰带宽占比、干扰强度和信噪比条件下的误码率性能;最后给出分析结果。研究表明,对于无干扰抑制技术辅助的直扩系统,干扰带宽占比越大,系统误码率则越低;对于有干扰抑制技术辅助的直扩系统,干扰带宽占比越大,系统误码率则越高,且在强干扰下误码率曲线存在明显的"错误盆底"效应。该研究对抗干扰技术选择以及干扰机的设计均有借鉴意义。In order to explore the new characteristics of direct sequence spread spectrum(DSSS) system assisted by interference suppression technology(IST) under jamming conditions,this paper studies the bit-error-rate(BER) performance of time-domain and frequency-domain ISTs with different interference bandwidth ratio(IBR) and intensity by Monte Carlo simulation.In this paper,a method for estimating the BER performance of DSSS is presented firstly.Then,the algorithm principles and implementation schemes of time-domain normalized LMS(NLMS) IST and frequency-domain IST based on FFT transform are briefly introduced.Meanwhile,BER performance with different IBRs,interference intensity and signal-to-noise ratio are studied in detail.Finally,the analysis results are given.The research shows that for DSSS with no IST assisted,the BER performance improves as IBR increases.But for DSSS with IST assisted, the results reversed, what is more,the BER curve shows"error-floor"under strong interference.The research can be used for reference in the selection of anti-jamming technology and the design of jammer.

关 键 词：窄带干扰 直扩系统 NLMS 频域抗干扰 

分 类 号：TN927.23[电子电信—通信与信息系统]