摘要
为了进一步提高直接序列扩频通信系统的窄带干扰抑制能力,本文实现了基于小波包变换的自适应阈值抑制窄带干扰算法。通过分析直扩信号在小波包分解后的能量分布特点,来设定自适应阈值以定位和剔除窄带干扰。解决了干扰判决阈值难以确定的问题。自适应阈值能够迅速跟踪和准确定位窄带干扰所在的子带,并对干扰的强度变化具有自适应的特点。仿真结果表明,该阈值抑制算法使直接序列扩频通信系统的抗干扰性能得到提高。
To further improve the ability of the direct sequence spread spectrum system restrai- ning the narrowband interference, adaptive threshold suppressing the narrowband interference is realized basing on wavelet packet transformation. Through analyzing the power spread of the DS signal in wavelet packet transform, the thesis sets the adaptive threshold to orientate and reject the narrowband interference. And the problem that the threshold is hard to settle is re- solved. The adaptive threshold can quickly track and accurately locate the contaminate subsid- iary-band, and be adaptive for the interference changing. Finally, the simulation results show that the anti-jamming ability of direct sequence spread spectrum （DSSS） is further improved by the threshold algorithm.
出处
《数据采集与处理》
CSCD
北大核心
2013年第6期843-847,共5页
Journal of Data Acquisition and Processing
基金
广西高校重点实验室(200912)资助项目
关键词
小波包变换
干扰抑制
直接序列扩频
wavelet packet transform
interference suppression
direct sequence spread spectrum
