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Multi-Constant Modulus Algorithm for Blind Decision Feedback Equalizer  

Kim, Jung-Su (CAD & Communication Circuit LAB., Dept. of Electronic Engineering, Hanyang University)
Chong, Jong-Wha (CAD & Communication Circuit LAB., Dept. of Electronic Engineering, Hanyang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.39, no.6, 2002 , pp. 709-717 More about this Journal
Abstract
A new multi constant modulus algorithm (MCMA) for a blind decision feedback equalizer is proposed. In order to avoid the error propagation problem in the conventional DFE structure, Feed-Back Filter coefficients are updated only after Feed-Forward Filter coefficients are sufficiently converged to the steady state. Therefore, it has the problem of slow convergence speed characteristics. To overcome this drawback, the proposed MCMA algorithm uses not only new cost function considering the minimum distance between the received signal and the representative value containing the statistical characteristics of the transmitted signal, but also adaptive step-size according to the equalizer outputs to fast convergence speed of FBF. Simulations were carried out under the certified communication channel environment to evaluate a performance of the proposed equalizer. The simulation results show that the proposed equalizer has an improved convergence and SER performance compared with previous methods. The proposed techniques offer the possibility of practical equalization for cable modem and terrestrial HDTV broadcast (using 8-VSB or 64-QAM) applications.
Keywords
HDTV; Blind; MCMA; Equalization; ISI;
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