Abstract
In this paper, we propose a spatial modulation (SM) space time block code (STBC) aided orthogonal time frequency space modulation (SM-STBC-OTFS) system to achieve both high transmission rate and diversity gain in the context of high mobility communication scenarios. Specifically, we apportion the information bits into multiple groups depending on the number of subcarriers and time slots, where each group is modulated by the SM. Next, Alamouti code, orthogonal STBC (OSTBC) and quasi-orthogonal STBC (Q-OSTBC) structures are associated with SM systems. Then the SM-STBC symbols are invoked by OTFS modulation based on different transmission cycle. Finally, block message passing (BMP) detector is designed for the proposed SM-STBC-OTFS systems, which provides significant performance gain in multiple-input and multiple-output (MIMO) configurations. Simulation results show that the SM-STBC-OTFS system relying on the proposed detector is capable of providing considerable bit error rate (BER) performance gains over the OTFS and the MIMO-OTFS systems.
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