电子学报2017，Vol.45Issue(6)：1506-1512,7.DOI:10.3969/j.issn.0372-2112.2017.06.032
基于循环平稳差异的直扩信号盲提取抗干扰方法
Anti-jamming Method by Blindly Extracting of Direct Sequence Spread Spectrum Signal Based on Cyclostationary Difference
摘要
Abstract
This paper presents a cyclostationary difference-based anti-jamming method by blindly extracting direct sequence spread spectrum signal.Aiming at approximate independence among source signals,an anti-jamming model based on blind source separation is established for direct sequence spread spectrum communication.And then,by using typical extreme points of cyclic autocorrelation function,a characteristic parameter called second-order cyclic difference degree is defined based on cyclostationary difference to distinguish between direct sequence spread spectrum signal and jamming.Finally pattern recognition is used to extract expected signal and suppress jamming by comparing the values of characteristic parameter,so as to achieve the purpose of anti-jamming.Simulation results show that,when the NSNR (Normalized Signal to Noise Ratio) is 9 dB and the SJR (Signal to Jamming Ratio) is-40 dB,the direct de-spreading /demodulation signal achieves the bit error rate (BER) of nearly IE-0.3,while the proposed algorithm achieves the biterror rate of as low as IE-3,which can extract the direct spread signal from the strong jamming effectively.关键词
阻塞干扰/扫频干扰/循环平稳/盲源分离/抗干扰Key words
barrage jamming/sweep-spot jamming/cyclostationary/blind source separation/anti-jamming分类
信息技术与安全科学引用本文复制引用
朱行涛,刘郁林,栗铁桩..基于循环平稳差异的直扩信号盲提取抗干扰方法[J].电子学报,2017,45(6):1506-1512,7.基金项目
新世纪优秀人才支持计划资助(No.NCET-11-0873) （No.NCET-11-0873）
重庆高校创新团队建设计划资助(No.KJTD201343) （No.KJTD201343）
