Adaptive Channel Equalization Using Decision Directed and Dispersion Minimizing Equalizers Trained by Variable Step Size Firefly Algorithm

Abstract

This paper signifies to present a design methodology for equalization of nonlinear channels for weights adaptation. Adaptive algorithms such as PSO, FFA, and VSFFA-based channel equalizer aimed to minimize inter-symbol interference associated with broadcast channel. In this paper, we implemented various channel equalizers such as decision directed equalizer, dispersion minimizing equalizer using PSO, FFA, and VSFFA which are principally derivative-free optimization tools. These algorithms are appropriately used to update weights of equalizers. Accomplishment of proposed diverse channel equalizers are evaluated in terms of mean square error (MSE) and BER plots and assessments are made using evolutionary algorithms applied to equalizers. It is observed that proposed equalizer-based adaptive algorithms, mostly VSFFA trained equalizers, offer improved performance so far as accurateness of reception is taken into account.