Combined channel and sequence estimation for fast adaptive equalization over frequency selective fading channels

Adaptive sequence estimation is an equalization procedure used to minimize the effect of severe intersymbol interference in frequency selective fading channels. Unfortunately, conventional adaptive methods suffer from substantial performance degradations under fast channel variations. A new approach to the adaptive sequence estimation problem is considered. A model for a combined channel and sequence estimation (CCSE) is proposed and used to present viable solutions which provide significant improvements in error performance. An analysis of the pairwise distances in the framework of CCSE is also presented, Finally, computer simulation results supporting the theoretical analysis and demonstrating the superiority of the new approach over conventional methods in fast fading channels are presented.