Iterative equalization of frequency selective channels

This paper addresses the channel equalization when multiple codes are under consideration. Multiple codes are designed by concatenating turbo codes in parallel fashion. Multiple turbo coded sequences are mapped to phase shift keying signals before passing throughout the severe intersymbol interface (ISI) channels. At the receiver, multistage decoding is utilized along with a group set partitioning technique to improve bit error rate (BER) performance. The noisy received signals are equalized by a combined DDFE and turbo decoding scheme called multilevel turbo equalization (MLTEQ). Simulation results depict that the proposed powerful MLTEQ scheme enables reliable digital communication with high bandwidth and power efficiency under intensive frequency dispersive channels