Joint user scheduling and phase shift design for RIS assisted multi-cell MISO systems

Luoluo Jiang, Xiao Li*, Michalis Matthaiou, Shi Jin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)
214 Downloads (Pure)

Abstract

This paper investigates the joint user scheduling and phase shift design for reconfigurable intelligent surface (RIS) assisted multi-cell downlink systems. A closed-form ergodic sum spectral efficiency (SE) approximation is utilized as the optimization metric. Based on this approximation, we schedule the users, whose cascaded channels are mostly correlated with each other’s, to maximize each user’s effective signal. Moreover, the RIS phase shift is designed to be the mean of the scheduled users’ cascaded channel phases. With the proposed transmission design, we find the optimal RIS deployment to achieve the highest maximum throughput which depends only on the relative locations of the BSs and RIS. In addition, we consider a more practical discrete RIS phase shift design based on a discrete Fourier transform (DFT) codebook. Simulation results show that the proposed low-complexity scheduling algorithm performs well.
Original languageEnglish
JournalIEEE Wireless Communications Letters
Early online date19 Dec 2022
DOIs
Publication statusEarly online date - 19 Dec 2022

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