一种抗多普勒效应的改进LMS算法  

An Improved LMS Algorithm for Doppler Effect Elimination

作　　者：刘晨[1] 郭辉[1] 王大鸣[1] 

机构地区：[1]解放军信息工程大学信息工程学院,河南郑州450002

出　　处：《通信技术》2008年第10期38-40,43,共4页Communications Technology

摘　　要：无线通信中多存在多普勒效应,对信号的均衡带来不利影响。文中研究了带频偏信号的均衡处理,仿真分析了多普勒频移条件下的均衡算法性能损失。在此基础上,文中提出了并分析了一种基于指数运算的LMS算法,该算法运算复杂度低,精度要求高,可扩大均衡器适应信号的频偏范围。仿真表明,该算法在小频偏环境下工作良好。Doppler effect always exists in wireless communication, and brings disadvantages to signal equalization. In this paper, the equalization process of the frequency shifted signal is studied, then the performance decline of the equalization algorithms under doppler effect also simulated. Based on the study, a new LMS algorithm using exponential operation is given. With low complexity and high accuracy requirement, this algorithm can expand the adaptive frequency shift range of the signals while equalizing. Simulation indicates that this algorithm works well in the condition of small frequency shift.

关 键 词：多普勒效应 频移 均衡 最小均方误差算法 

分 类 号：TN911.5[电子电信—通信与信息系统]