Cooperative RIS and STAR-RIS Assisted mMIMO Communication: Analysis and Optimization

6G networks; correlated Rayleigh fading; Double-RIS; simultaneously transmitting and reflecting RIS; spectral efficiency; 6g network; Array signal processing; Correlated Rayleigh fading; Double-reconfigurable intelligent surface; Optimisations; Rayleigh channel; Reconfigurable; Simultaneously transmitting and reflecting reconfigurable intelligent surface; Spectral efficiencies; Wireless communications; Automotive Engineering; Aerospace Engineering; Computer Networks and Communications; Electrical and Electronic Engineering

Abstract :

[en] Reconfigurable intelligent surface (RIS) has emerged as a cost-effective and promising solution to extend the wireless signal coverage and improve the performance via passive signal reflection. Different from existing works which do not account for the cooperation between RISs or do not provide full space coverage, we propose the marriage of cooperative double-RIS with simultaneously transmitting and reflecting RIS (STAR-RIS) technologies denoted as RIS/STAR-RIS under correlated Rayleigh fading conditions to assist the communication in a massive multiple-input multiple-output (mMIMO) setup. The proposed architecture is superior since it enjoys the benefits of the individual designs. We introduce a channel estimation approach of the cascaded channels with reduced overhead. Also, we obtain the deterministic equivalent (DE) of the downlink achievable sum spectral efficiency (SE) in closed form based on large-scale statistics. Notably, relied on statistical channel state information (CSI), we optimise both surfaces by means of the projected gradient ascent method (PGAM), and obtain the gradients in closed form. The proposed optimization achieves to maximise the sum SE of such a complex system, and has low complexity and low overhead since it can be performed at every several coherence intervals. Numerical results show the benefit of the proposed architecture and verify the analytical framework. In particular, we show that the RIS/STAR-RIS architecture outperforms the conventional double-RIS or its single-RIS counterparts.

Disciplines :

Computer science

Author, co-author :

Papazafeiropoulos, Anastasios ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom ; SnT at the University of Luxembourg, Esch-sur-Alzette, Luxembourg

Elbir, Ahmet M. ; University of Luxembourg, Interdisciplinary Centre for Security, Reliability, and Trust (SnT), Esch-sur-Alzette, Luxembourg

Kourtessis, Pandelis ; University of Hertfordshire, Communications and Intelligent Systems Research Group, Hatfield, United Kingdom

KRIKIDIS, Ioannis ; University of Cyprus, IRIDA Research Centre for Communication Technologies, Department of Electrical and Computer Engineering, Nicosia, Cyprus

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

External co-authors :

yes

Language :

English

Title :

Cooperative RIS and STAR-RIS Assisted mMIMO Communication: Analysis and Optimization

Publication date :

September 2023

Journal title :

IEEE Transactions on Vehicular Technology

ISSN :

0018-9545

Publisher :

Institute of Electrical and Electronics Engineers Inc.

Volume :

Issue :

Pages :

11975 - 11989

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://xplorestaging.ieee.org/ielx7/25/10254672/10093070.pdf?arnumber=10093070

Funding text :

University of Hertfordshire's 5-year Vice Chancellor's Research Fellowship National Research Fund, Luxembourg 10.13039/501100008530-European Regional Development Fund Republic of Cyprus (Grant Number: INFRASTRUCTURES/1216/0017) 10.13039/501100000781-European Research Council (Grant Number: 819819)

Data Set :

https://ieeexplore.ieee.org/document/10093070

Available on ORBilu :

since 30 November 2023

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