Adaptive Equalization with Interference Reconstruction and Cancellation Based on MSER Criterion for OTFS System

Orthogonal time-frequency space (OTFS) modulation has obtain much attentions due to its capability for providing reliable transmission compared to orthogonal frequency division multiplexing (OFDM), especially in dynamic scenarios. In this paper, we propose an adaptive decision feedback equalizer with interference reconstruction and cancellation (ADFE-IRC) based on minimal symbol error rate (MSER) criterion for OTFS systems. Firstly, the proposed method performs adaptive filtering in the delay dimension to eliminate inter-symbol interference (ISI). Then the performance loss caused by cyclic convolution and phase flipping is improved by interference cancellation and reconfiguration. Finally, the Doppler dimension filtered signal is used as the final output of the equalizer. Doppler dimensional interference elimination is finally performed. The simulation results demonstrate the error performance of the proposed method.