[2303.09183] User Selection for Simple Passive Beamforming in Multi-RIS-Aided Multi-User Communications
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Computer Science > Information Theory

arXiv:2303.09183 (cs)
[Submitted on 16 Mar 2023]

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

Authors:Wei Jiang, Hans D. Schotten
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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.
Comments: 2023 IEEE 97th Vehicular Technology Conference (VTC2023-Spring)
Subjects: Information Theory (cs.IT); Signal Processing (eess.SP)
Cite as: arXiv:2303.09183 [cs.IT]
  (or arXiv:2303.09183v1 [cs.IT] for this version)
  https://doi.org/10.48550/arXiv.2303.09183

Submission history

From: Wei Jiang [view email]
[v1] Thu, 16 Mar 2023 09:53:46 UTC (297 KB)
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