This paper investigates the amalgamation of affine frequency division multiplexing (AFDM) with sparse code multiple access (SCMA), termed as AFDM-SCMA, to facilitate massive connectivity in high-mobility scenarios. We start by introducing the basic principles of SCMA and AFDM systems and then present the proposed AFDM-SCMA system with multiple input and multiple output (MIMO) for both downlink and uplink channels. A two stage detector is proposed for the multi-user detection of the downlink channels. Additionally, to reduce the detection complexity and exploit the channel sparsity, we propose an expectation propagation algorithm (EPA)-aided low complexity receiver for uplink channels. Through numerical simulations, we validate the enhanced performance of the proposed AFDM-SCMA systems compared to conventional orthogonal frequency division multiplexing-empowered SCMA (OFDM-SCMA) systems in terms of error rate performance.


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    Titel :

    Building MIMO-SCMA Upon Affine Frequency Division Multiplexing for Massive Connectivity over High Mobility Channels


    Beteiligte:
    Luo, Qu (Autor:in) / Zhu, Jing (Autor:in) / Xiao, Pei (Autor:in) / Chen, Gaojie (Autor:in) / Shi, Jia (Autor:in) / Lu, Chen (Autor:in)


    Erscheinungsdatum :

    24.06.2024


    Format / Umfang :

    570643 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch



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