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Alternate Adaptation Algorithm for Blind Channel Equalization  

Oh, Kil-Nam (Dept. of Optical Communications Engineering, Gwangju University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SP / v.48, no.4, 2011 , pp. 129-135 More about this Journal
Abstract
The alternate adaptation algorithm (AAA) is proposed to improve the convergence characteristics and steady-state performance of the constant modulus algorithm (CMA). The alternate adaptation algorithm is a new equalization method which adapts an equalizer alternately by the algorithm with excellent blind convergence characteristics or the algorithm with better steady-state error performance. In this paper, it is introduced that the alternate adaptation equalization of the vsCMA (variable step-size CMA) and the decision-directed (DD) algorithm. We, first, designed the vsCMA with variable step-size to improve the steady-state error performance of the CMA, and combined it with the DD by alternate adaptation. As a result, it was mitigated that the sensitivity of performance fluctuation due to switching timing in CMA-DD switching method, and it was improved that the convergence speed and steady-state error performance of the CMA. Through computer simulations, under multipath channel condition, the usefulness of the proposed method was confirmed for 16-QAM.
Keywords
Blind equalization; Alternate adaptation algorithm; Variable step-size parameter; CMA;
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