Near-optimum soft decision equalization for frequency selective MIMO channels

Soft decision equalization (SDE) techniques are developed for frequency selective multiple-input multiple-output (MIMO) channels in the quest for low-complexity equalizers with error performance competitive to that of maximum likelihood (ML) sequence detection. Simulation comparisons of the SDE methods with minimum-mean-square error (MMSE)-based MIMO decision feedback equalization (DFE) and sphere decoded quasi-ML detection are presented.