Dispersion Matrix Optimization for Space-Time Shift Keying

In this Letter, we introduce an efficient dispersion matrix optimization technique for the recent concept of Space Time Shift Keying (STSK). By exploiting the STSK-specific signal structure relying on the dispersion-matrix activation, rather than the classic spatial multiplexing, computational complexity imposed by the system optimization is reduced by tens of times, in comparison to that of the conventional approach. Our simulation results reveal that the proposed technique substantially reduces computational cost and time required for the dispersion-matrix optimization, which is especially beneficial for large search-space scenarios, such as a high number of transmit antennas, symbols per space-time block and constellation points.