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Review

Reconfigurable Intelligent Surfaces for 5G and beyond Wireless Communications: A Comprehensive Survey

1
Departement des Sciences Appliquées, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada
2
Department of Electrical and Computer Engineering, Laval University, Québec, QC G1V 0A6, Canada
*
Author to whom correspondence should be addressed.
Academic Editors: Alberto Geri and Daniele D. Giusto
Energies 2021, 14(24), 8219; https://doi.org/10.3390/en14248219
Received: 12 August 2021 / Revised: 20 November 2021 / Accepted: 2 December 2021 / Published: 7 December 2021
(This article belongs to the Special Issue Wireless Communication Technologies in 5G and 6G)
With possible new use cases and demanding requirements of future 5th generation (5G) and beyond cellular networks, the future of mobile communications sounds promising. However, the propagation medium has been considered a randomly acting agent between the transmitter and the receiver. With the advent of the digital age of wireless communications, the received signal quality is degrading due to the uncontrollable interactions of the transmitted radio waves with the surrounding artifacts. This paper presents a comprehensive literature review on reconfigurable intelligent surfaces (RISs) and assisted application areas. With the RIS, the network operators can control radio waves’ scattering, reflection, and refraction characteristics by resolving the harmful properties of environmental wireless propagation. Further, the RIS can effectively control the wavefront, such as amplitude, phase, frequency, and even polarization, without requiring complex encoding, decoding, or radio wave processing techniques. Motivated by technological advances, the metasurfaces, reflectarrays, phase shift, and liquid crystals are potential candidates for implementing RIS. Thus, they can be considered the front runner for realizing the 5G and beyond network. Furthermore, the current research activities in the evolving field of wireless networks operated by RIS are reviewed and discussed thoroughly. Finally, to fully explore the potential of RISs in wireless networks, the fundamental research issues to be addressed have been discussed. View Full-Text
Keywords: meta-surfaces; 5G; line-of-sight; reconfigurable intelligent surfaces; liquid crystal; field programmable gate arrays; smart reflect-arrays; wireless communications meta-surfaces; 5G; line-of-sight; reconfigurable intelligent surfaces; liquid crystal; field programmable gate arrays; smart reflect-arrays; wireless communications
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MDPI and ACS Style

Sharma, T.; Chehri, A.; Fortier, P. Reconfigurable Intelligent Surfaces for 5G and beyond Wireless Communications: A Comprehensive Survey. Energies 2021, 14, 8219. https://doi.org/10.3390/en14248219

AMA Style

Sharma T, Chehri A, Fortier P. Reconfigurable Intelligent Surfaces for 5G and beyond Wireless Communications: A Comprehensive Survey. Energies. 2021; 14(24):8219. https://doi.org/10.3390/en14248219

Chicago/Turabian Style

Sharma, Teena, Abdellah Chehri, and Paul Fortier. 2021. "Reconfigurable Intelligent Surfaces for 5G and beyond Wireless Communications: A Comprehensive Survey" Energies 14, no. 24: 8219. https://doi.org/10.3390/en14248219

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