基于加权判决信号的判决反馈盲均衡新算法  

A New Decision Feedback Blind Equalization Algorithm Based on Weighted Decision Signal

作　　者：周巧喜[1] 杜锋[1] 

机构地区：[1]安徽理工大学电气与信息工程学院,安徽淮南232001

出　　处：《科技情报开发与经济》2007年第32期158-160,共3页Sci-Tech Information Development & Economy

摘　　要：判决反馈常数模盲均衡算法(CMADFE),在均衡的起始阶段,由于眼图未睁开,容易引起判决器的误判,导致收敛速度慢。为了减小误判的影响,在迭代初期把判决信号加权后送入反馈滤波器中,当均衡一段时间后再把判决信号不需加权直接送入反馈滤波器,从而得到加权的CMADFE算法。计算机仿真表明,加权的CMADFE算法提高了收敛速度,且均方误差亦有所减小。Constant modulus algorithm for decision feedback blind equalization （CMADFE）has the defect of slow convergence rate,aseye diagram is closed in the first phase of the equalization and that causes the misjudgment of decision device. In order to reduce the misjudgment, at the beginning of iteration a weighted decision signal is sent to the feedback filter and after a period of equalization an unweighted decision signal is directly sent to the feedback filter and a weighted CMADFE algorithm is thus obtained. Computer simulation proves weighted CMADFE algorithm has the faster convergence rate and less mean square error than CMADFE algorithm.

关 键 词：判决反馈盲均衡 加权 常数模 判决导引 

分 类 号：TN911[电子电信—通信与信息系统]