A Recursive Step Multi-Modulus Algorithm for Blind Equalization Based on Normalized CMA
Yingmin Wang · Jisuanji fangzhen · 2006
Considering the characteristic of the M-QAM signals which lies on several circles with known radius,this paper presents a new blind equalization algorithm which combines the benefits of the Normalized constant modulus algorithm(NCMA) and the recursive step multi-modulus algorithm.In respect that this algorithm can adjust step automatically,the ultimate step can reach an optimum value and remnant error can arrive at minimum value simultaneity.In addition,in order to speed up the convergence process,this algorithm can switch over to a Decision-Directed equalization scheme once the error level is reasonably low.The computer simulation results demonstrate fast convergence and satisfactory performance with these proposed algorithms.