变步长LMS算法抑制窄带干扰技术研究  

The research of narrowband interference suppression on variable step size LMS algorithm

作　　者：王雯婷[1] 葛海波[1] 王艳艳[1] 

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121

出　　处：《电子技术应用》2015年第2期89-92,96,共5页Application of Electronic Technique

基　　金：陕西省教育厅自然科学研究基金项目(2011JM8038)

摘　　要：为抑制窄带信号并减少其对直接序列扩频通信系统的干扰,研究了一种新的变步长LMS算法处理信号。根据步长调节原则,结合双曲正割函数来调整步长μ(n)及误差e(n)的非线性关系。对算法进行理论分析,该算法提高了收敛速度,提升了收敛精度,降低了稳态时的误差。在MATLAB中通过搭建直接序列扩频通信系统进行仿真,研究结果表明该算法优于已有的算法,能更准确地预测及抑制音频干扰信号,增强了直扩通信系统的抗干扰性能。In order to suppression the narrowband signal and reduce the interference of the DSSS, a new variable step size LMS adaptive algorithm is proposed for signal processing. According to the principle of adjusting step size, to adjust the step size/x（n） and error e（n） nonlinear relation. Combing with the hyperbolic secant function curve theory analysis shows that the algorithm acce- larates the convergence speed, improves the convergence precision, and reduces the error in steady state. In MATLAB building a DSSS, the analysis resuhs indicate that the proposed algorithm outperforms the existing algorithms, can be more accurate in predic- tion and suppression of audio signal interference and enhances the anti-jamming performance of DSSS communication system.

关 键 词：变步长LMS 窄带干扰 直接序列扩频 双曲正割 

分 类 号：TN914.4[电子电信—通信与信息系统]