适用于圆形高阶QAM信号的盲均衡算法  

Blind Equalization Algorithm for Circle High-order QAM Signals

作　　者：吴天琳 彭华[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：《信号处理》2014年第7期822-829,共8页Journal of Signal Processing

基　　金：河南省自然科学基金资助项目(0611051400);河南省基础与前沿基金资助项目(082300413205)

摘　　要：针对现有盲均衡算法大多仅适用于方形或十字形QAM信号的问题,本文提出了一种适用于圆形高阶QAM信号的混合盲均衡算法。该算法首先对区域多模盲均衡算法进行改进,提出了新的区域划分方法并将其与改进的多模盲均衡算法相结合,构造了新的误差模型使之与圆形星座匹配程度大大提高;然后将其与判决引导算法和数据重用技术有机结合,构成低稳态误差的快速混合盲均衡算法。与其他同类型盲均衡算法相比,本文算法对于圆形星座高阶QAM信号尤为有效,不仅降低了稳态误差,且大幅度减少了收敛所需符号数。仿真结果验证了该算法的有效性。Aiming at equalizing circle high-order QAMsignals,a hybrid blind equalization algorithm based on region is proposed.The algorithm modified a region based multi-modulus blind equalization algorithm suitable for square QAM signals by redividing the constellation and combines it with modified multi-modulus blind equalization algorithm to construct a new error function which matches the circle constellation well.Decision directed algorithm and data reusing are brought in to make up a hybrid blind equalization algorithm with low residual error and high convergence rate.Compared with other blind equalization algorithms,the new algorithm is more suitable for circle high-order QAMsignals.It not only reduces the residual error but also cut down the number of symbols needed to get convergence greatly.Simulation results prove the feasibility of the new algorithm.

关 键 词：区域 QAM 混合盲均衡算法 判决引导 数据重用 

分 类 号：TN911.7[电子电信—通信与信息系统]