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- W4385800638 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." @default.
- W4385800638 created "2023-08-15" @default.
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- W4385800638 date "2023-06-01" @default.
- W4385800638 modified "2023-10-16" @default.
- W4385800638 title "User Selection for Simple Passive Beamforming in Multi-RIS-Aided Multi-User Communications" @default.
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- W4385800638 doi "https://doi.org/10.1109/vtc2023-spring57618.2023.10201204" @default.
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