| 扩频谱相关自适应滤波技术的研究 |
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| 引用本文： | 王丹志,邵定蓉,李署坚. 扩频谱相关自适应滤波技术的研究[J]. 遥测遥控, 2005, 0(4) |
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| 作者姓名： | 王丹志 邵定蓉 李署坚 |
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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(王丹志，邵定蓉)，北京航空航天大学电子信息工程学院 北京100083(李署坚) |
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| 摘 要： | 被高速伪随机码调制的扩频信号,其伪随机码是具有随机编码信号特征的周期信号。所以,扩频信号应被建模为周期信号(循环平稳信号)。循环平稳信号与其信号的频移副本之间具有很强的谱相关性,充分利用这种谱相关性可以实现对窄带和宽带干扰的抑制。基于循环平稳理论和自适应滤波理论,提出了一种基于改进的LMS算法的扩频信号谱相关自适应滤波技术。这种变步长的谱相关自适应LMS滤波器能实现对窄带和宽带干扰的抑制,仿真结果证明了其有效性。
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| 关 键 词： | 扩频通信 循环平稳 谱相关 自适应滤波 干扰抑制 |
Study of the Spectral Correlation Adaptive Filtering for Spread Spectrum Communications |
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| Wang Danzhi Shao Dingrong Li Shujian. Study of the Spectral Correlation Adaptive Filtering for Spread Spectrum Communications[J]. Telemetry & Telecontrol, 2005, 0(4) |
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| Authors: | Wang Danzhi Shao Dingrong Li Shujian |
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| Affiliation: | Wang Danzhi Shao Dingrong Li Shujian |
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| Abstract: | The spread spectrum (SS) signal is modulated by high-rate pseudo noise code, and belongs to typically periodic signal. Accordingly, this signal should be modeled as the-cyclostationary. The frequency-shifted versions of the cyclostationary signal can be highly correlated with the original signal, and the spectral correlation can be sufficient utilized to mitigate the interference of the narrowband and wideband. Based on the theory of the cyclostationary and adaptive filtering, a spectral correlation adaptive filter based on improving LMS algorithm is proposed. The spectral correlation LMS adaptive filter can reject the interference of the narrowband and wideband, the simulation results show the effectiveness of the method. |
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| Keywords: | SS communications Cyclostationary Spectral correlation Adaptive filtering Interference rejection |
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