| 扩频通信系统中窄带干扰抑制技术的研究 |
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| 作者姓名： | 柏廷广 邵定蓉 李署坚 徐晓燕 |
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| 作者单位： | 北京航空航天大学电子信息工程学院 北京100083(柏廷广，邵定蓉，李署坚)，北京遥测技术研究所 北京100076(徐晓燕) |
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| 摘 要： | 提出一种基于小波包变换抑制窄带干扰的简化方法,利用直接序列扩频信号的功率谱密度分布特点和能量聚集度准则,快速、有效地跟踪输入信号频谱的变化,从而对扩频信号中的干扰进行快速定位;通过自适应改变权系数的方法实现对强、弱窄带干扰的分别抑制。仿真结果表明,这种自适应干扰抑制法既可以有效地清除快速时变的强窄带干扰,又可在处理其他类型干扰时避免或减小有用信息的损失,从而大大提高了直接序列扩频系统在复杂干扰情况下的抗干扰性能。
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| 关 键 词： | 小波包变换 窄带干扰 自适应滤波 直接序列扩频 |
Suppression of Narrowband Interference for Spread Spectrum Communication Systems |
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| Authors: | Bai Tingguang Shao Dingrong Li Shujian Xu Xiaoyan |
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| Abstract: | A simplified method of the narrowband interference (NBI) suppression based on wavelet package transform(WPT) is presented in this paper.Based on the power spectrum density(PSD) of the Direct Sequence Spread Spectrum(DSSS) signal and the criterion of energy compaction measure(ECM),this method can track the change of the input signal spectrum and locate the interference in the spread spectrum signal efficiently and quickly,and then change the tap weight adaptively to suppress the strong or weak NBI separately.The simulation results show that the adaptive interference suppression method can eliminate the fast time change strong NBI and decrease the loss of useful information during the processing.So the anti-interference performance of the system is improved. |
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| Keywords: | WPT NBI Adaptive filter DSSS |
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