一种低复杂度并行软方向判决恒模盲均衡算法  

A low complexity concurrent soft decision-directed constant modulus blind equalization algorithm

作　　者：张成榆[1] 林斌[1] 刘人杰[1] 

机构地区：[1]大连海事大学 信息工程学院,辽宁大连116026

出　　处：《辽宁工程技术大学学报（自然科学版）》2009年第4期608-611,共4页Journal of Liaoning Technical University (Natural Science)

基　　金：交通部应用基础研究基金资助项目(2005329225060)

摘　　要：针对并行软方向判决的CM盲均衡算法(CMA+SDD)可以明显改善单纯CMA均衡器性能,只是其运算量比较大的问题,在不产生星座缩减现象条件下,对CMA+SDD算法进行简化,提出一种能根据均衡器输出信号星座点位置对复平面进行随机划分的低复杂度算法。该算法可以克服S.Chen算法采用固定复平面划分带来的收敛慢的缺点,并减少了计算量。16QAM仿真结果表明该算法的收敛速度比S.Chen的算法快,并在低信噪比(SNR)下算法表现良好。Based on the concurrent soft decision-directed constant modulus algorithm （CMA＋SDD）, the blind equalization greatly improves the CMA＇s performance. However, the CMA＋SDD requires a large amount of computations. In this paper, a simplified algorithm is proposed based on the concurrent soft decision-directed CMA. The proposed algorithm partitions a complex plan stochastically without generating a scaled-down constellation. At the same time, the proposed algorithm overcomes the disadvantages associated with a fixed complex plan partition. Simulation results for 16QAM show that the proposed algorithm offers a faster convergence speed than that of S. Chen＇ algorithm and performs very well at a low SNR.

关 键 词：盲信道均衡 恒模算法 码间干扰 正交幅度调制 

分 类 号：TN911.5[电子电信—通信与信息系统]