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Single-user blind channel equalization using modified constant modulus algorithm

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4 Author(s)
Shouyu Sun ; Department of Electronic Engineering, Tsinghua University, Beijing 100084, China; Beijing Institute of Information Technology, Beijing 100088, China ; Junli Zheng ; Lijiang Wu ; Qi Zhang

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.

Published in:

Tsinghua Science and Technology  (Volume:9 ,  Issue: 1 )