Low Complexity Soft Detection for Spatially Multiplexed BICM MIMO OFDM System
This paper presents a new approach to soft detection of spatial data streams in Multiple Input Multiple Output (MIMO) channels in slow fading channels. The authors focus on high spectral efficiency Bit Interleaved Coded Modulation (BICM) MIMO OFDM system where, after serial to parallel conversion and per antenna coding, spatial data streams are simultaneously transmitted by using an antenna array. They propose a detection algorithm based on a combination of linear and non linear detection techniques. The proposed algorithm orders spatial streams as per V-BLAST ordering and then uses linear detectors like MMSE or Zero Forcing (ZF) to detect the streams which have seen good channel realizations and therefore enjoy higher Signal-to-Noise-Ratios (SNRs).