To ensure system scalability and to mitigate inter-user interference in cell-free massive MIMO (CF-mMIMO), a user-centric (UC) antenna-clustering approach was investigated. In this UC approach, user-centric antenna-clusters are formed by selecting cooperating antennas for each user, and postcoding is applied by regarding users whose antenna-clusters overlap as interfering users. However, in very high user density environments, since the number of interfering users increases due to increased overlapping of antenna-clusters, the achievable link capacity may degrade. In this paper, we propose a user-cluster-centric (UCC) approach, which groups neighborhood users into a user-cluster and associates the predetermined number of antennas to the user cluster for spatial multiplexing. We evaluate, by computer simulation, the uplink capacity of UCC CF-mMIMO using zero-forcing (ZF) and minimum mean square error (MMSE) based postcoding. We confirm that the proposed UCC approach can provide higher link capacity in a high user density environment.


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    Titel :

    Evaluation of Uplink Capacity of User-Cluster-Centric Cell-Free massive MIMO


    Beteiligte:
    Takahashi, Ryo (Autor:in) / Matsuo, Hidenori (Autor:in) / Xia, Sijie (Autor:in) / Chen, Qiang (Autor:in) / Adachi, Fumiyuki (Autor:in)


    Erscheinungsdatum :

    01.09.2022


    Format / Umfang :

    575485 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch