Treffer: On the performance of active RIS-enhanced NOMA systems with spectrum sharing mechanisms.

Title:
On the performance of active RIS-enhanced NOMA systems with spectrum sharing mechanisms.
Authors:
Tran M; Advanced Intelligent Technology Research Group, Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, Ho Chi Minh City, Vietnam., Bui Vu M; Faculty of Engineering and Technology, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam., Nguyen SQ; Posts and Telecommunications Institute of Technology, Ho Chi Minh City, Vietnam.
Source:
PloS one [PLoS One] 2025 Nov 25; Vol. 20 (11), pp. e0336951. Date of Electronic Publication: 2025 Nov 25 (Print Publication: 2025).
Publication Type:
Journal Article
Language:
English
Journal Info:
Publisher: Public Library of Science Country of Publication: United States NLM ID: 101285081 Publication Model: eCollection Cited Medium: Internet ISSN: 1932-6203 (Electronic) Linking ISSN: 19326203 NLM ISO Abbreviation: PLoS One Subsets: MEDLINE
Imprint Name(s):
Original Publication: San Francisco, CA : Public Library of Science
MeSH Terms:
Computer Communication Networks* , Wireless Technology*, Algorithms ; Humans ; Models, Theoretical
References:
Sensors (Basel). 2019 Feb 01;19(3):. (PMID: 30717155)
Adv Sci (Weinh). 2022 Apr;9(11):e2105960. (PMID: 35142443)
Sensors (Basel). 2023 Jan 03;23(1):. (PMID: 36617128)
PLoS One. 2024 Dec 20;19(12):e0315123. (PMID: 39705226)
Entry Date(s):
Date Created: 20251125 Date Completed: 20251125 Latest Revision: 20251128
Update Code:
20251128
PubMed Central ID:
PMC12646486
DOI:
10.1371/journal.pone.0336951
PMID:
41289311
Database:
MEDLINE

Weitere Informationen

This paper presents a comprehensive performance analysis of a downlink non-orthogonal multiple access (NOMA) network assisted by an active reconfigurable intelligent surface (ARIS) in a cognitive spectrum-sharing scenario. Unlike conventional passive RIS (PRIS), the ARIS can both adjust phase shifts and amplify incident signals, thereby mitigating inter-user interference and overcoming multiplicative fading. We consider a two-user secondary network coexisting with a primary user, where the base station communicates with the secondary users via the ARIS. Closed-form expressions for the outage probability (OP), throughput, energy efficiency (EE), and an approximation for the ergodic data rate (EDR) are derived under Nakagami-m fading, along with asymptotic OP analysis to reveal the achievable diversity order. We also formulate and solve an optimization problem for the NOMA power allocation coefficient to minimize OP. The main contributions are: (i) proposing an ARIS-assisted NOMA architecture for spectrum-sharing networks and comparing it with PRIS and orthogonal multiple access (OMA) schemes; (ii) deriving exact OP, throughput, and EE expressions, and an approximate EDR expression, validated by Monte Carlo simulations; (iii) providing asymptotic OP analysis to characterize the diversity order; and (iv) optimizing NOMA power allocation to minimize OP. Numerical results confirm that ARIS significantly outperforms PRIS and OMA in terms of OP, throughput, EC, and EE, demonstrating its potential to enhance spectral efficiency, reliability, and coverage in next-generation spectrum-sharing NOMA networks.
(Copyright: © 2025 Tran et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)

The authors have declared that no competing interests exist.