Single-User Blind Channel Equalization Using Modified Constant Modulus Algorithm  

作　　者：孙守宇 郑君里 吴里江 张琪 

机构地区：[1]Department of Electronic Engineering, Tsinghua University, Beijing 100084, China [2]Beijing Institute of Information Technology, Beijing 100088, China

出　　处：《Tsinghua Science and Technology》2004年第1期38-44,共7页清华大学学报（自然科学版（英文版）

基　　金：the National Natural Science Foundation of China (60072001)

摘　　要：A modified constant modulus algorithm (MCMA) for blind channel equalization is proposed by modifying the constant modulus error function. The MCMA is compared with the conventional constant modulus algorithm (CMA) for symbol-spaced equalization of 4PSK signals. The result shows that the performance of the MCMA is superior to that of the CMA in both convergence rate and intersymbol interference for frequency selective channels in noisy environments. Simulation results using 8PSK signals also demonstrate that a fractionally spaced equalizer can preserve performance over variations in symbol-timing phase, whereas a baud-rate equalizer cannot.A modified constant modulus algorithm (MCMA) for blind channel equalization is proposed by modifying the constant modulus error function. The MCMA is compared with the conventional constant modulus algorithm (CMA) for symbol-spaced equalization of 4PSK signals. The result shows that the performance of the MCMA is superior to that of the CMA in both convergence rate and intersymbol interference for frequency selective channels in noisy environments. Simulation results using 8PSK signals also demonstrate that a fractionally spaced equalizer can preserve performance over variations in symbol-timing phase, whereas a baud-rate equalizer cannot.

关 键 词：blind channel equalization constant modulus algorithm (CMA) modified constant modulus algorithm (MCMA) symbol spaced equalization fractionally spaced equalization (FSE) 

分 类 号：TP301.6[自动化与计算机技术—计算机系统结构]