Power Allocation and Link Selection for Multicell Cooperative NOMA Hybrid VLC/RF Systems

Mohanad Obeed, Hayssam Dahrouj, Anas M. Salhab, Anas Chaaban, Salam A. Zummo, Mohamed-Slim Alouini

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


This paper proposes and optimizes a cooperative non-orthogonal multiple-access (Co-NOMA) scheme in the context of multicell visible light communications (VLC) networks to mitigate inter-cell interference. Consider a network where each access-point (AP) serves two users. In each cell, the weak user (cell-edge user) can be served either directly by the VLC AP, or through the strong user that decodes the weak user message and forwards it through the radio-frequency (RF) link. The paper then considers the problem of maximizing the sum-rate under quality-of-service constraints by allocating the powers of the messages and APs, and determining the links serving each weak user. The paper solves this non-convex problem by first finding closed-form solutions of the users’ powers and link selection for fixed APs powers. The APs powers are then iteratively solved in an outer loop. Simulation results show that the proposed scheme improves the sum-rate and fairness as compared to non-orthogonal multiple-access (NOMA) scheme.
Original languageEnglish (US)
Pages (from-to)1-1
Number of pages1
JournalIEEE Communications Letters
StatePublished - 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-08
Acknowledgements: This work was supported by the Deanship of Scientific Research in King Fahd University of Petroleum & Minerals (KFUPM) under Grant DF181024. The authors would also like to acknowledge the KFUPM-King Abdullah University of Science and Technology (KAUST) research initiative that resulted from this research work. The work was also supported by the Natural Sciences and Engineering Research Council of Canada (NSERC).


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