| 扩频通信系统中自适应陷波滤波器的性能仿真研究 |
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| 引用本文： | 薛敦伟,周旭平.扩频通信系统中自适应陷波滤波器的性能仿真研究[J].宇航学报,2012,33(4):500-506. |
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| 作者姓名： | 薛敦伟 周旭平 |
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| 作者单位： | 1. 北京航空航天大学电子信息工程学院， 北京 100191； 2.上海航天电子有限公司，上海 201821 |
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| 基金项目： | 收稿日期：20110626; 修回日期：20111108 |
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| 摘 要： | 针对直接序列扩频通信系统中的窄带强干扰信号，研究了基于即时干扰频率估计与陷波滤波器的自适应开环干扰抑制方法。重点比较了2阶IIR，3系数FIR与5系数FIR陷波滤波器对扩频信号波形畸变和系统误码率的不同影响。探讨了使用此3种干扰抑制方法构建一个抗窄带干扰能力达60dB以上的扩频通信系统的可行性。研究结果表明在具有成形滤波器的直扩通信系统模型下，与RS(255,223)码结合使用，2阶IIR陷波滤波器的处理增益为1023的单纯直接序列扩频系统在信噪比-10dB 及系统误码率10 -6 的条件下具有60dB以上的抗窄带干扰能力；而使用3系数或5系数FIR陷波滤波器的扩频通信系统不可能达到60dB的抗窄带干扰能力。
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| 关 键 词： | IIR陷波滤波器 FIR陷波滤波器 扩频通信 窄带干扰 误码率 |
| 收稿时间： | 2011-06-26 |
Simulation Research on Adaptive IIR Notch Filter in Spread Spectrum Communication System |
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| XUE Dun-wei
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ZHOU Xu-ping.Simulation Research on Adaptive IIR Notch Filter in Spread Spectrum Communication System[J].Journal of Astronautics,2012,33(4):500-506. |
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| Authors: | XUE Dun-wei ZHOU Xu-ping |
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| Institution: | 1. School of Electronic & Information Engineering of Beijing University, Beijing 100191, China; 2.Shanghai Aerospace Electronics Company Ltd., Shanghai 201821, China |
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| Abstract: | The narrow band interference suppression performance of adaptive 2nd-order IIR,3-coefficient-FIR and 5-coefficient-FIR notch filters are investigated for direct-sequence spread spectrum(DS-SS) communication systems through computer simulation.The feasibility of constructing a DS-SS system with narrow band interference suppression capability of 60dB is studied in detail.It is found that combined with a pulse-shaping filter and an RS(255,223) code,a DS-SS system with processing gain of 1023 and the 2nd-order IIR notch filter can provide the narrow band interference suppression capability of 60dB at SNR of-10dB and BER of 10-6;but the same DS-SS systems with the 3-coefficient-FIR or 5-coefficient-FIR IIR notch filters are not able to provide the capability. |
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| Keywords: | IIR notch filter FIR notch filter Spread spectrum Narrow band interference Bit error rate(BER) |
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