On the achievable max-min user rates in multi-carrier centralized noma-vlc networks

Omar Maraqa*, Umair F. Siddiqi, Saad Al-Ahmadi, Sadiq M. Sait

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


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.

Original languageEnglish
Article number3705
Issue number11
StatePublished - 1 Jun 2021

Bibliographical note

Funding Information:
Funding: This research was funded by the King Fahd University of Petroleum and Minerals grant number SB191038. “The APC was funded by SB191038”.

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.


  • Centralized light access network (C-LiAN)
  • Max-min user rate
  • Non-orthogonal multiple access (NOMA)
  • Optimization
  • Simulated annealing (SA) algorithm
  • Subcarrier allocation
  • Visible light communications (VLC)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Information Systems
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Instrumentation
  • Electrical and Electronic Engineering


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