低信噪比下基于自适应门限的窄带干扰抑制研究  

Research on Narrowband Interference Suppression Based on Adaptive Threshold Under Low SNR

作　　者：张爱民[1] 胡艳龙[1] 韩方景[1] 

机构地区：[1]国防科技大学电子科学与工程学院,长沙410073

出　　处：《电子信息对抗技术》2009年第1期51-54,共4页Electronic Information Warfare Technology

摘　　要：对一种基于自适应门限的变换域窄带干扰抑制技术进行了研究。该技术根据在低信噪比下接收信号经过快速傅立叶变换后数据的统计特性,估计出高斯白噪声和干扰之间的门限值,然后将高于门限的干扰谱线幅度值抑制到与噪声相近的程度,大大减少了干扰信号的功率,从而提高信噪比。理论分析和仿真结果表明,该技术改善了系统性能且便于硬件实现。A method of narrowband interference suppression in transform-domain, which is based on adaptive threshold, is presented. According to statistical characters of the received signal with fast Fourier Transform under low SNR, the threshold between narrowband interference and White Gaussian noise is estimated, and then the magnitude of those spectral lines which exceeds the threshold is reduced to the level of magnitude of noise spectral lines, so that the interference power is reduced greatly and the SNR of the received signal is improved dramatically. Theoretical analysis and simulation show that the method has good performance in DSSS and hardware implementation is simple.

关 键 词：直接序列扩频系统 自适应门限 窄带干扰抑制 

分 类 号：TN973.21[电子电信—信号与信息处理]