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Article

On the Achievable Max-Min User Rates in Multi-Carrier Centralized NOMA-VLC Networks

1
Department of Electrical Engineering, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
2
Center of Communications and IT Research, Research Institute, King Fahd University of Petroleum & Minerals, Dhahran 31261, Saudi Arabia
*
Author to whom correspondence should be addressed.
Academic Editor: Chen Chen
Sensors 2021, 21(11), 3705; https://doi.org/10.3390/s21113705
Received: 24 April 2021 / Revised: 14 May 2021 / Accepted: 18 May 2021 / Published: 26 May 2021
(This article belongs to the Collection Visible Light Communication (VLC))
Visible light communications (VLC) is gaining interest as one of the enablers of short-distance, high-data-rate applications, in future beyond 5G networks. Moreover, non-orthogonal multiple-access (NOMA)-enabled schemes have recently emerged as a promising multiple-access scheme for these networks that would allow realization of the target spectral efficiency and user fairness requirements. The integration of NOMA in the widely adopted orthogonal frequency-division multiplexing (OFDM)-based VLC networks would require an optimal resource allocation for the pair or the cluster of users sharing the same subcarrier(s). In this paper, the max-min rate of a multi-cell indoor centralized VLC network is maximized through optimizing user pairing, subcarrier allocation, and power allocation. The joint complex optimization problem is tackled using a low-complexity solution. At first, the user pairing is assumed to follow the divide-and-next-largest-difference user-pairing algorithm (D-NLUPA) that can ensure fairness among the different clusters. Then, subcarrier allocation and power allocation are solved iteratively through both the Simulated Annealing (SA) meta-heuristic algorithm and the bisection method. The obtained results quantify the achievable max-min user rates for the different relevant variants of NOMA-enabled schemes and shed new light on both the performance and design of multi-user multi-carrier NOMA-enabled centralized VLC networks. View Full-Text
Keywords: visible light communications (VLC); centralized light access network (C-LiAN); non-orthogonal multiple access (NOMA); max-min user rate; subcarrier allocation; simulated annealing (SA) algorithm; optimization visible light communications (VLC); centralized light access network (C-LiAN); non-orthogonal multiple access (NOMA); max-min user rate; subcarrier allocation; simulated annealing (SA) algorithm; optimization
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MDPI and ACS Style

Maraqa, O.; Siddiqi, U.F.; Al-Ahmadi, S.; Sait, S.M. On the Achievable Max-Min User Rates in Multi-Carrier Centralized NOMA-VLC Networks. Sensors 2021, 21, 3705. https://doi.org/10.3390/s21113705

AMA Style

Maraqa O, Siddiqi UF, Al-Ahmadi S, Sait SM. On the Achievable Max-Min User Rates in Multi-Carrier Centralized NOMA-VLC Networks. Sensors. 2021; 21(11):3705. https://doi.org/10.3390/s21113705

Chicago/Turabian Style

Maraqa, Omar, Umair F. Siddiqi, Saad Al-Ahmadi, and Sadiq M. Sait 2021. "On the Achievable Max-Min User Rates in Multi-Carrier Centralized NOMA-VLC Networks" Sensors 21, no. 11: 3705. https://doi.org/10.3390/s21113705

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