On decision-feedback detection of nondiagonal differential space-time modulation in temporally correlated fading channels

Existing works on decision-feedback detection (DFD) of differential space-time modulation (DSTM) were largely confined to diagonal constellations. In other works considering nondiagonal constellations, the temporal variation of fading In the DSTM supersymbol duration was ignored. In this paper, we take a close look at the DFD receiver structure for nondiagonal DSTM In temporally correlated fading. We identify the constellations of which the error performance Is not influenced by ignorance of fading variation. In addition, by analyzing the error performance, we demonstrate that existing DFD is, however, fundamentally mismatched to other constellations in fast fading. A major conclusion is that diagonal design still plays an important role for the efficacy of DFD for nondiagonal constellations in fast fading.