RIS-Assisted Wireless Communications: Long-Term Versus Short-Term Phase Shift Designs

coverage probability; ergodic rate; gradient ascent method; Reconfigurable intelligent surface; Coverage probabilities; Ergodic rates; Fadings channels; Finite element analyse; Gradient ascent; Gradient ascent method; Optimisations; Reconfigurable; Wireless communications; Electrical and Electronic Engineering

Abstract :

[en] Reconfigurable intelligent surface (RIS) has recently gained significant interest as an emerging technology for future wireless networks thanks to its potential for improving the coverage in challenging propagation environments. This paper studies an RIS-Assisted communication system, where a source transmits data to a destination in the presence of a weak direct link. We analyze and compare RIS designs based on long-Term and short-Term channel statistics in terms of coverage probability and ergodic rate. For the considered optimization designs, we derive closed-form expressions for the coverage probability and ergodic rate, which explicitly unveil the impact of the propagation environment and the RIS on the system performance. Besides the optimization of the RIS phase profile, we formulate an RIS placement optimization problem with the aim of maximizing the coverage probability by relying only on partial channel state information. An efficient algorithm is proposed based on the gradient ascent method. Simulation results are illustrated in order to corroborate the analytical framework and findings. The proposed RIS phase profile is shown to outperform several heuristic benchmark schemes in terms of outage probability and ergodic rate. In addition, the proposed RIS placement strategy provides an extra degree of freedom that remarkably improves the system performance.

Disciplines :

Computer science

Author, co-author :

Van Chien, Trinh ; Hanoi University of Science and Technology, School of Information and Communication Technology (SoICT), Hanoi, Viet Nam

Tu, Lam-Thanh ; Ton Duc Thang University, Communication and Signal Processing Research Group, Faculty of Electrical and Electronics Engineering, Ho Chi Minh City, Viet Nam

Khalid, Waqas ; Institute of Industrial Technology, Korea University, Sejong, South Korea

Yu, Heejung ; Korea University, Department of Electronics and Information Engineering, Sejong, South Korea

CHATZINOTAS, Symeon ; University of Luxembourg > Interdisciplinary Centre for Security, Reliability and Trust (SNT) > SigCom

Di Renzo, Marco ; Université Paris-Saclay, CNRS, Centrale-Supélec, Laboratoire des Signaux et Systèmes, Gif-sur-Yvette, France

External co-authors :

yes

Language :

English

Title :

RIS-Assisted Wireless Communications: Long-Term Versus Short-Term Phase Shift Designs

Publication date :

01 February 2024

Journal title :

IEEE Transactions on Communications

ISSN :

0090-6778

eISSN :

1558-0857

Publisher :

Institute of Electrical and Electronics Engineers Inc.

Volume :

Issue :

Pages :

1175 - 1190

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.scopus.com/record/display.uri?eid=2-s2.0-85180195073&doi=10.1109%2fTCOMM.2023.3328550&origin=inward&txGid=b1b42a310743736d5f10e62dbd8d4854

Funders :

Hanoi University of Science and Technology
Ministry of Science and ICT (MIST), Korea, under the Information Technology Research Center
Institute for Information & Communications Technology Planning & Evaluation
Luxembourg National Fund (FNR)-RISOTTI-the Reconfigurable Intelligent Surfaces for Smart Cities
European Commission through the H2020 ARIADNE project
H2020 RISE-6G project
Agence Nationale de la Recherche

Data Set :

https://www.scopus.com/record/display.uri?eid=2-s2.0-85180195073&doi=10.1109%2fTCOMM.2023.3328550&origin=inward&txGid=b1b42a310743736d5f10e62dbd8d4854

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since 21 November 2024

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