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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    Title :

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


    Contributors:
    Luo, Qu (author) / Zhu, Jing (author) / Xiao, Pei (author) / Chen, Gaojie (author) / Shi, Jia (author) / Lu, Chen (author)


    Publication date :

    2024-06-24


    Size :

    570643 byte





    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English



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