基于CMA算法的双模式盲均衡算法

常数模算法（ＣＭＡ）的收敛速度非常缓慢。为了加快收敛过程，一旦误码率降低到足够低，该算法必须切换到ＤＤ算法。为了克服这些缺点，本文利用ＱＡＭ信号分布在几个已知半径的圆上的特点，提出了两类多模盲均衡算法。在此基础上又提出一种双模式均衡方案：多模算法模式和常数模算法模式。研究表明，两类多模算法及双模式均衡方案收敛快，收敛性能也令人满意

Dual Mode Algorithms for Blind Equalization Based on CMA

The constant modulus algorithm exhibits very slow convergence rates.In order to speed up the convergence process,this algorithm may be switch over to a Decision Directed equalization scheme once the error level is reasonably low.In this paper,in order to overcome these shortcomings,two multiple modulus algorithms are proposed based on considering the characteristic of the QAM signals which lies on several circles with known radius.Then,we present a scheme which is capable of operating in two modes:constant modulus algorithm mode and multiple modulus algorithm mode.The computer simulation results demonstrate fast convergence and satisfactory performance with these proposed algorithm.