一种T/4分数间隔预测判决反馈盲均衡算法  

A T/4 fractionally spaced predictive decision feedback blind equalization algorithm

作　　者：霍亚娟[1] 葛临东[1] 王彬[1] 

机构地区：[1]信息工程大学信息工程学院,郑州450002

出　　处：《信号处理》2010年第7期992-997,共6页Journal of Signal Processing

基　　金：河南省基础与前沿项目(082300413205)

摘　　要：为了消除由深衰落信道引起的严重码间干扰,本文给出一种基于改进双模式多模算法的T/4分数间隔预测判决反馈均衡器。该均衡器采用改进的双模式多模算法独立优化前向、反馈滤波器,前向滤波器采用T/4分数间隔,反馈滤波器采用预测结构,仍为符号速率。在两种深衰落信道条件下仿真实验表明,本文给出的均衡器能够避免传统判决反馈均衡器的误收敛情况;同时其稳态均方误差小于基于常模算法的T/4分数间隔均衡器、基于常模算法的T/4分数间隔判决反馈均衡器,以及基于双模式多模算法的T/4分数间隔预测判决反馈均衡器,更适合处理QAM信号。In order to eliminate the severe inter-symbol interference caused by severe channel fading,this paper presents a T/4 fractionally spaced predictive decision feedback equalizer based on modified Dual Mode Multi-modulus Algorithm （DM-MMA）. The forward and feedback filters are designed separately with modified DM-MMA. The forward filter is designed to be a T/4 fractionally spaced filter,such that the taps are spaced at a fraction of the symbol rate,while the feedback filter with a predictive structure is implemented as a symbol rate filter. According to the simulation experiment results under the condition of two severe fading channels,the equalizer presented in this paper can avoid ill-convergence solution caused by conventional decision feedback structure,and the steady-state mean-square errors of the equalizer are less than that of the T/4 fractionally spaced equalizer based on Constant Modulus Algorithm（CMA）,T/4 fractionally spaced decision feedback equalizer based on CMA,and T/4 fractionally spaced predictive decision feedback equalizer based on Modified DM-MMA,which makes it more suitable for QAM signals.

关 键 词：分数间隔 预测判决反馈 双模式多模算法 QAM信号 

分 类 号：TN911.5[电子电信—通信与信息系统]