摘要
针对直接序列扩频(direct sequence spread spectrum,DSSS)通信系统中窄带干扰(narrow-band interference,NBI)抑制问题,将窄带干扰存在性识别技术(recognition of interference existence,RIE)和变换域窄带干扰抑制算法相结合,提出了一种自适应窄带干扰抑制算法。该算法能根据接收到的信号,利用基于能限因子的RIE算法判断接收信号中是否含有窄带干扰信号,从而决定是否需要对其进行干扰抑制处理。理论分析表明,当接收信号中不含窄带干扰或干扰信号较小时,既可减少由于窄带干扰抑制算法对有用信号造成的损伤,提高误码率性能,又能降低系统处理的复杂度。仿真结果表明,自适应窄带干扰抑制方案抑制干扰误码率性能明显优于非自适应窄带干扰抑制方案。
Aiming at the narrow-band interference （ NBI ） problem in the direct sequence spread spectrum （ DSSS ） communication system , an adaptive NBI suppression （ A-NBI-S） algorithm is proposed in the paper. The new algorithm combined the technolog of RIE （ recognition of interference existence） with transform domain NBI suppression （NBI-S） al-gorithm. According to the received signals, the proposed algorithm can determine whether the received signal contains NBI signals by using the RIE algorithm based on energy limiting factor and determine whether the received signals needs to go through the processing of NBI-S. Theoretical analysis shows that, when the received signal is free of NBI or the interference signal is small, A-NBI-S algorithm can reduce the damage to useful signal and improve BER performance. At the same time , it can reduce the computation complexity of DSSS system. Simulation results show that A-NBI-S algorithm is signifi-cantly better than non-adaptive NBI-S （NA-NBI-S） algorithm on BER performance.
出处
《重庆邮电大学学报（自然科学版）》
CSCD
北大核心
2016年第3期291-296,共6页
Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)
基金
国家自然科学基金(61201134
61201135)
高等学校学科创新引智计划资助(B08038)
天地一体化信息技术国家重点实验室(筹)开放基金资助项目(2014_CXJJ-TX_06)~~
关键词
直接序列扩频
窄带干扰存在性识别
自适应窄带干扰抑制
direct sequence spread spectrum （ DSSS ）
recognition of interference existence （ RIE）
adaptive NBI suppres-sion （ A-NBI-S）
