基于加权判决信号的判决反馈盲均衡新算法

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。

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

Constant modulus algorithm for decision feedback blind equalization(CMADFE)has the defect of slow convergence rate,as eye 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.