Comparative analysis of V-BLAST and Space time Block coded Spatial Modulation in Rayleigh and AWGN Channels

Multiple Input Multiple Outputs MIMO; Space-Time Coding (STC) improves the BER by adding diversity in the presence of a channel fading. The V-BLAST and D-BLAST techniques are designed to improve the data rate. The performance of these techniques is highly dependent on the MIMO channel environment. Space-time block coded spatial modulation (STBC-SM) combine’s spatial modulation (SM) and space-time block coding (STBC) to take advantage of the benefits of both. In the STBC-SM scheme, the transmitted information symbols are expanded not only to the space and time domains but also to the spatial (antenna) domain which corresponds to the on/off status of the transmit antennas available at the space domain, and therefore high spectral efficiency along with diversity advantage of STBC. The performance of the STBC-SM, V-BLAST and D-BLAST are compared at high and low SNR environment. It is observed that STBC-SM performs better than V-BLAST and D-BLAST but with more decoding complexity.