Energy-efficient RIS-enabled SISO-OFDMA communication via lower bound optimization

Bidabadi, S., Ouameur, M. A., Bagaa, M. et Massicotte, D. (2024). Energy-efficient RIS-enabled SISO-OFDMA communication via lower bound optimization. Electronics, 13 (6). p. 1040. ISSN 2079-9292 DOI 10.3390/electronics13061040

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Résumé

The pursuit of energy-efficient solutions in the context of reconfigurable intelligent surface (RIS)-assisted wireless networks has become imperative and transformative. This paper investigates the integration of RIS into an orthogonal frequency-division multiple access (OFDMA) framework for multi-user downlink communication systems. We address the challenge of jointly optimizing RIS reflection coefficients alongside OFDMA frequency and power allocations, with the aim of maximizing energy efficiency. This optimization is subject to specific quality-of-service (QoS) requirements for each user equipment (UE) and a constraint on transmission power and the RIS phase shift matrix. To address this complex optimization problem, we propose a novel practical and low-complexity approach that is based on optimizing a computationally efficient and numerically tractable lower bound on energy efficiency. The numerical results highlight the effectiveness of our approach, demonstrating a substantial increase in energy efficiency compared to scenarios without RIS, with random RIS integration, and with the scheme using the Genetic Algorithm (GA).

Type de document:	Article
Mots-clés libres:	RIS-assisted network OFDMA Energy efficiency RIS phase design
Date de dépôt:	22 juill. 2024 12:46
Dernière modification:	22 juill. 2024 12:46
Version du document déposé:	Version officielle de l'éditeur
URI:	https://depot-e.uqtr.ca/id/eprint/11379

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