针对线性群时延畸变的加权多模盲均衡算法  

Weighted Multimodulus Blind Equalization Algorithm for The Linear Group Delay Distortion

作　　者：王雷[1,2] 吴长奇[2] 

机构地区：[1]92785部队 [2]燕山大学信息学院

出　　处：《信号处理》2012年第7期1037-1043,共7页Journal of Signal Processing

摘　　要：群时延失真是影响卫星通信系统误码性能的重要因素之一。本文分析了高速卫星信道的线性群时延模型,依此模型提出了改进的加权多模盲均衡算法(MWMMA)。该算法引入Sigmoid函数的变形形式,构造了加权幂指数随迭代误差自适应变化的函数关系,在不需要通过大量仿真实验预先确定模式转变门限值的前提下,利用迭代误差的递减实现算法从MCMA模式通过多模自适应切换为DD模式。通过对多种算法的仿真比较,得到该算法不仅能使通过群时延信道的16QAM信号收敛集中,而且具有更小的稳态剩余码间干扰;同时,基于该算法对64QAM和256QAM传输信号的均衡仿真结果,验证了该算法对高阶QAM信号的均衡具有一定的适用性。Group delay distortion is one of the important factors influencing satellite communication system BER perform- ance. This paper analyzed the linear group delay model for the high speed data transmission satellite channel, and proposed an modified weighted muhimodulus blind equalization algorithm （MWMMA）. The algorithm constructs a function between the weighted exponent and the iterative error based on the deformation form of Sigrnoid function, which does not need the predetermined threshold value from extensive simulation experiments, making the algorithm from MCMA mode through a muhimode adaptive switching to DD mode by the iterative error decreasing. Through matlab simulations of various algo- rithms, the new algorithm can not only make 16QAM signal passed the group delay channel convergence focus, but has least steady residual inter symbol interference; at the same time, based on the simulation result of equalizing 64QAM and 256QAM transmission signal with the new algorithm, verifies that the algorithm has certain applicability for high order QAM signal equalization.

关 键 词：群时延 加权多模 盲均衡 模式切换 码间干扰 

分 类 号：TN911.5[电子电信—通信与信息系统]