基于自适应步长LMS算法的判决反馈均衡器研究  

The Study on Decision Feedback Equalizer Based on LMS Algorithm with Adaptive steps

作　　者：张玉良[1] 吴伟陵[1] 田宝玉[1] 贺志强[1] 高路[1] 

机构地区：[1]北京邮电大学,181信箱北京100876

出　　处：《电路与系统学报》2003年第3期113-117,共5页Journal of Circuits and Systems

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。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.

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) 

分 类 号：TN911.5[电子电信—通信与信息系统]