Research on Maximum Ratio Combining Detection for MIMO-OTSM

Orthogonal time sequency multiplexing (OTSM) is a novel modulation scheme proposed in recent years. It provides higher performance than orthogonal frequency division multiplexing (OFDM) in time-varying channels, similar to the performance of orthogonal time frequency space (OTFS), but with lower complexity than OTFS. Multiple-input multiple-output (MIMO) systems can effectively improve spectral efficiency. Therefore, in this study, we perform data detection in the time domain for MIMO-OTSM systems based on the maximum ratio combining (MRC) principle. The receiver receives signals from different antennas and propagation paths, and uses MRC technology to combine the received signals
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after iteration, the signal to interference plus noise ratio (SINR) is maximized. Simulation results show that in a MIMO system, even in high mobile scenarios, OTSM exhibits bit error rate (BER) performance similar to OTFS. Furthermore, the system performance improves with the increase of the number of antennas.