| 基于自适应步长LMS算法的判决反馈均衡器研究 |
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| 引用本文： | 张玉良,吴伟陵,田宝玉,贺志强,高路.基于自适应步长LMS算法的判决反馈均衡器研究[J].电路与系统学报,2003,8(3):113-117. |
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| 作者姓名： | 张玉良 吴伟陵 田宝玉 贺志强 高路 |
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| 作者单位： | 北京邮电大学,181信箱,北京,100876 |
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| 摘 要： | 本文研究了一种基于自适应步长LMS算法的自适应判决反馈均衡器算法，此算法通过对前向滤波器、后向滤波器和锁相环参数分别进行实时的、自适应步长的调整，在均衡时变多径的同时高精度地锁定接收信号相位，因此适用于相干通信系统。仿真结果表明在相同多径条件下，该方法比基于固定步长LMS算法的判决反馈均衡器输出误码率低1-7倍。
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| 关 键 词： | 判决反馈均衡器 相干通信技术 LMS算法 符号间干扰（ISI） |
| 文章编号： | 1007-0249(2003)03-0113-05 |
| 修稿时间： | 2002年6月27日 |
The Study on Decision Feedback Equalizer Based on LMS Algorithm with Adaptive steps |
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| ZHANG Yu-liang,WU Wei-ling,TIAN Bao-yu,HE Zhi-qiang,GAO Lu.The Study on Decision Feedback Equalizer Based on LMS Algorithm with Adaptive steps[J].Journal of Circuits and Systems,2003,8(3):113-117. |
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| Authors: | ZHANG Yu-liang WU Wei-ling TIAN Bao-yu HE Zhi-qiang GAO Lu |
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| Abstract: | An adaptive decision-feedback-equalizer algorithm based on adaptive step LMS algorithm is introduced. Using this algorithm, the phase of the received signal can be locked accurately, and the time-varying multi-path channel can be equalized by adjusting the coefficients of feed-forward filter, feedback filter and phase-locked-loop in real time with different adaptive steps. Therefore, it is suitable for coherent communication. Simulation results show that the output BER of the proposed equalizer is 1-7 times lower than that of decision-feedback-equalizer based on fixed step LMS algorithm under the same multi-path condition. |
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| Keywords: | decision feedback equalizer coherent communication LMS algorithm inter-symbol-interference (ISI) |
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