Reduced-Complexity Soft STBC Detection

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Inspired by the scientific breakthrough of Turbo Codes (TCs) proposed, a near-capacity performance has been pursued by numerous researchers in diverse system contexts. However, as the researchers have inched closer and closer to the channel capacity, the complexity of the resultant communication systems was increased. The soft-decision aided MIMO detection typically contributes a large portion of the total complexity, owing to the fact that the conventional MIMO detection is typically operated on a matrix-by-matrix basis. Among all the generalized MIMO schemes presented, both the Spatial Modulation (SM) as well as the Space-Time Shift Keying (STSK) may be detected on a symbol-by-symbol basis, because only a single L-PSK/QAM symbol is transmitted in a SM/STSK transmission matrix.