| 直接序列扩频通信中抑制窄带干扰的非线性滤波方法 |
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| 引用本文： | 孙丽萍,胡光锐. 直接序列扩频通信中抑制窄带干扰的非线性滤波方法[J]. 上海交通大学学报, 2003, 37(3): 338-340 |
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| 作者姓名： | 孙丽萍 胡光锐 |
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| 作者单位： | 上海交通大学电子工程系,上海,200030 |
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| 基金项目： | 国家自然科学基金资助项目 (60 172 0 18) |
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| 摘 要： | 分析了干扰形式为单音和自回归过程时信噪比改善的闭合表达式。仿真结果表明，对于单音干扰，在接近载波频率处非线性滤波器比线性滤波器有10dB的信噪比改善；对于自回归形式的干扰，信噪比改善会随着输入信噪比的变化而改变，但在输入信噪比很大时，非线性滤波器比线性滤波器有近5dB的改善。
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| 关 键 词： | 直接序列扩频通信 窄带干扰 非线性滤波器 |
| 文章编号： | 1006-2467(2003)03-0338-03 |
| 修稿时间： | 2002-03-27 |
Narrow-Band Interference Rejection Technique in DS Spread Spectrum Systems Employing Nonlinear Filters |
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| SUN Li ping,HU Guang rui. Narrow-Band Interference Rejection Technique in DS Spread Spectrum Systems Employing Nonlinear Filters[J]. Journal of Shanghai Jiaotong University, 2003, 37(3): 338-340 |
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| Authors: | SUN Li ping HU Guang rui |
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| Abstract: | The narrow band interference(NBI) rejection capability of direct sequence spread spectrum (DS SS) can be further enhanced by employing interference rejection filters. The performance of nonlinear filters was analyzed in the presence of narrow band interference. Closed form analytical expressions for the signal to noise ration improvement factor were derived for single tone and first order autoregressive (AR) interference. The simulation results show that, for the single tone interference near the carrier frequency, the SNR improvement factor of nonlinear filter is 10dB larger than the linear filter, for the AR interference, the SNR improvement factor varies with the input SNR, but at large input SNR, the nonlinear filter is 10dB larger than the linear filter. |
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| Keywords: | direct sequence spread spectrum narrow band interference nonlinear filter |
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