Diversity-Achieving Quadrature Spatial Modulation Aided MIMO-OTFS Transmission

In this letter, a diversity-achieving quadrature spatial modulation (DAQSM) aided multiple-input multiple-output orthogonal time frequency space (MIMO-OTFS) scheme is proposed, which can provide both transmit diversity and higher spectral efficiency (SE). Through the design of expansion matrices (EMs), the proposed scheme can be conveniently extended to scenarios with more than two transmit antennas. Furthermore, we present the analytical expression of bit error rate (BER) and diversity analysis. Simulation results demonstrate the superior performance of the proposed scheme compared to related schemes in high-mobility scenarios.