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Opportunistic Reflection in Reconfigurable Intelligent Surface-Assisted Wireless Networks

Wei Jiang; Hans Dieter Schotten
In: Proceedings of the IEEE 2023 International Symposium on Personal, Indoor and Mobile Radio Communications. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC-2023), 6G The Next Horizon - From Connected People and Things to Connected Intelligence, September 5-8, Toronto, ON, Canada, IEEE, 9/2023.


This paper focuses on multiple-access protocol design in a wireless network assisted by multiple reconfigurable intelligent surfaces (RISs). By extending the existing approaches in single-user or single-RIS cases, we present two benchmark schemes for this multi-user multi-RIS scenario. Inspecting their shortcomings, a simple but efficient method coined opportunistic multi-user reflection (OMUR) is proposed. The key idea is to opportunistically select the best user as the anchor for optimizing the RISs, and non-orthogonally transmitting all users' signals simultaneously. A simplified version of OMUR exploiting random phase shifts is also proposed to avoid the complexity of RIS channel estimation.