This paper focuses on multi-user downlink signal transmission in a wireless system aided by multiple reconfigurable intelligent surfaces (RISs). In such a multi-RIS, multi-user, multi-antenna scenario, determining a set of RIS phase shifts to maximize the sum throughput becomes intractable. Hence, we propose a novel scheme that can substantially simplify the optimization of passive beamforming. By opportunistically selecting a user with the best channel condition as the only active transmitter in the system, it degrades to single-user passive beamforming, where two methods, i.e., joint optimization based on the semidefinite relaxation approach and alternating optimization, are applicable. The superiority of the proposed scheme is demonstrated through Monte-Carlo simulations.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    User Selection for Simple Passive Beamforming in Multi-RIS-Aided Multi-User Communications


    Beteiligte:
    Jiang, Wei (Autor:in) / Schotten, Hans D. (Autor:in)


    Erscheinungsdatum :

    01.06.2023


    Format / Umfang :

    1008111 byte





    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch




    User Selection and Rank Adaptation for Multi-User Massive MIMO with Hybrid Beamforming

    Miyazaki, Hiroyuki / Suyama, Satoshi / Okuyama, Tatsuki et al. | IEEE | 2017


    Robust and Secure Transmission Design in Multi-User STAR-RIS-Aided Communications

    Pala, Sonia / Singh, Keshav / Taghizadeh, Omid et al. | IEEE | 2024


    Transmit Antenna Selection for Multi-User Underlay Cognitive Transmission with Zero-Forcing Beamforming

    Hanif, Muhammad / Yang, Hong-Chuan / Alouini, Mohamed-Slim | IEEE | 2016