User Selection in Reconfigurable Intelligent Surface Assisted Communication Systems

Journal article

Gan, Xu, Zhong, C., Zhu, Y. and Zhong, Z. (2021). User Selection in Reconfigurable Intelligent Surface Assisted Communication Systems. IEEE Communications Letters. 25 (4), pp. 1353-1357. https://doi.org/10.1109/lcomm.2020.3048782
AuthorsGan, Xu, Zhong, C., Zhu, Y. and Zhong, Z.
Abstract

This paper presents a detailed investigation on the performance of reconfigurable intelligent surface (RIS)-assisted communication system with user scheduling. Depending on the availability of channel state information (CSI) at the RIS, two separate scenarios are considered, namely without CSI and with CSI. Closed-form expressions are derived for the ergodic capacity of the system in both scenarios. It is found that CSI has a significant impact on the performance of the system. Without CSI, the RIS provides an array gain of N, where N is the number of reflecting elements, and user scheduling provides an multi-user gain of log logM, where M is the number of users. With CSI, the RIS provides an array gain of N2, while no multi-user diversity gain can be obtained.

KeywordsModelling and Simulation; Electrical and Electronic Engineering; Computer Science Applications
Year2021
JournalIEEE Communications Letters
Journal citation25 (4), pp. 1353-1357
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
ISSN1089-7798
2373-7891
Digital Object Identifier (DOI)https://doi.org/10.1109/lcomm.2020.3048782
Funder/ClientNatural Science Foundation of Zhejiang Province
National Natural Science Foundation of China
National Key R&D Program of China
Publication dates
Print01 Jan 2021
Publication process dates
Deposited04 Jan 2021
Accepted author manuscript
License
File Access Level
Open
Page range1-1
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