User Selection for Simple Passive Beamforming in Multi-RIS-Aided Multi-User Communications
arxiv(2023)
Abstract
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.
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Key words
multiantenna scenario,multiple reconfigurable intelligent surfaces,multiRIS-aided multiuser communications,multiuser downlink signal transmission,RIS phase shifts,simple passive beamforming,single-user passive beamforming,user selection,wireless system
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