The finite-length multi-input multi-output MMSE-DFE

A new theoretical framework is introduced for analyzing the performance of a finite-length minimum-mean-square-error decision feedback equalizer (MMSE -DFE) in a multi-input multi-output (MIMO) environment. The framework inclu des transmit and receive diversity systems as special cases and quantifies the diversity performance improvement as a function of the number of transm it/receive antennas and equalizer taps. Fast and parallelizable algorithms for computing the finite-length MIMO MMSE-DFE are presented for three commo n multi-user detection scenarios.