短波极低信噪比扩频系统中窄带干扰的抑制  

Narrow-band interference suppression in high-frequency spread spectrum system under extremely low SNR

作　　者：刘英挺[1] 朱晓明[1] 刘全諹 邱为峰 

机构地区：[1]西安电子科技大学ISN国家重点实验室,西安710071 [2]甘肃省环境科学设计研究院,兰州730030

出　　处：《重庆邮电大学学报（自然科学版）》2007年第5期554-557,共4页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：频域的LMS自适应滤波算法可以有效抑制扩频系统中的强窄带干扰。在短波极低信噪比扩频系统中,提出了一种权值初值选取方法,该方法既可以用来判别是否存在窄带干扰,又可以使权值迅速收敛,简单易行。采用时域加窗和重叠相加,大大减弱了截断效应的影响。仿真结果验证了该算法在加快收敛速度以及改善系统性能方面的有效性。LMS adaptive filters can suppress high power narrow-band interference effectively in frequency domain. In HF spread spectrum system under the condition of extremely low SNR, a method for selecting initial weight is proposed. This method can be used to decide whether the narrow-band interference exists and accelerate the convergence rate of frequency adaptive filtering. Effect of truncation is reduced by using data window and overlapped the data between close together data segments. Computer simulation results are presented to validate the validity of the proposed algorithm for accelerating the convergence rate and improving system performance.

关 键 词：短波 低信噪比 扩频通信 窄带干扰抑制 自适应滤波 时域加窗 权值初值 

分 类 号：TN973.32[电子电信—信号与信息处理]