MIMO-DFE based BLAST over Frequency Selective channels

A BLAST receiver architecture based on the MIMO-DFE (Multiple-Input-Multiple-Out Decision Feedback Equalizer) is proposed to combat FS (Frequency Selective) channels. At each stage of detection, a MIMO-DFE in the MMSE sense is employed to estimate signals simultaneously, and multiple signal streams are selected for output and contribute to interference cancellation. The MIMO-DFE based BLAST promises a performance advantage over the MISO-DFE (Multiple-Input-Single-Output DFE) based BLAST where a MISO-DFE is used at each stage. It is also shown that the MIMO-DFE based BLAST requires less complexity than the MISO-DFE based BLAST because fewer equalizer stages and less computation for ordering signals are required.