The multiple-input multiple-output orthogonal time frequency space (MIMO-OTFS) has emerged as a promising scheme for high-mobility wireless communications. The unitary approximate message passing (UAMP) detection has demonstrated outstanding performance in the single-input single-output (SISO)-OTFS system. However, We found that directly employing the UAMP detection for the MIMO-OTFS system results in performance degradation and the emergence of an error floor. Therefore, we propose a minimum mean square error (MMSE)-aided UAMP scheme, incorporating MMSE to assist UAMP by providing the prior information. Notably, we reduce the complexity by setting a signal-to-noise ratio (SNR) threshold, only when SNR exceeds the threshold shall we start the MMSE-aided mechanism. Simultaneously, we analyze the impact of fractional delay and consider it into system model, aiming to optimize the practicality of the system. Simulation results under fast-fading Rayleigh channels demonstrate that the proposed MMSE-aided UAMP significantly outperforms the original UAMP in the medium to high SNR range.


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    Titel :

    MMSE-Aided Unitary Approximate Message Passing Detection for MIMO-OTFS System


    Beteiligte:
    Ma, Xuanyun (Autor:in) / Xu, Jin (Autor:in) / Dong, Chao (Autor:in) / Niu, Kai (Autor:in) / Zhang, Hongze (Autor:in)


    Erscheinungsdatum :

    24.06.2024


    Format / Umfang :

    353964 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch