User Pairing, Link Selection, and Power Allocation for Cooperative NOMA Hybrid VLC/RF Systems

Obeed, Mohanad; Dahrouj, Hayssam; Salhab, Anas M.; Zummo, Salam A.; Alouini, Mohamed‐Slim

doi:10.1109/twc.2020.3036444

Cited by 59 publications

(41 citation statements)

References 47 publications

(87 reference statements)

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“…This new OFDM scheme design improves optimization and allocation of both power and bandwidth for both technologies which allows the network to achieve better performance. Moreover, multiple studies proposed using NOMA which appeared to be less sensitive to LOS availability compared to OFDMA [202], [255], [256]. In [255], a novel energy efficient NOMA hybrid RF/VLC system has been proposed.…”

Section: [242]mentioning

confidence: 99%

“…Authors have further demonstrated that NOMA is less sensitive to LOS compared to its OFDMA-based counterpart. In [256], multiple access techniques were performed for maximizing the overall achievable data rate where they jointly decide on the power allocation coefficients, pairing index, and link selection. However, the non-cooperative nature of NOMA makes users competing on resources.…”

Section: [242]mentioning

confidence: 99%

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Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future Directions

et al. 2021

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Wireless communications refer to data transmissions in unguided propagation media through the use of wireless carriers such as radio frequency (RF) and visible light (VL) waves. The rising demand for high data rates, especially, in indoor scenarios, overloads conventional RF technologies. Therefore, technologies such as millimeter waves (mmWave) and cognitive radios have been adopted as possible solutions to overcome the spectrum scarcity and capacity limitations of the conventional RF systems. In parallel, visible light communication (VLC) has been proposed as an alternative solution, where a light source is used for both illumination and data transmission. In comparison to RF links, VLC links present a very high bandwidth that allows much higher data rates. VLC exhibits also immunity to interference from electromagnetic sources, has unlicensed channels, is a very low power consumption system, and has no health hazard. VLC is appealing for a wide range of applications including reliable communications with low latency such as vehicle safety communication. Despite the major advantages of VLC technology and a variety of its applications, its use has been hampered by its cons such as its dependence on a line of sight connectivity. Recently, hybrid RF/VLC systems were proposed to take advantage of the high capacity of VLC links and better connectivity of RF links. Thus, hybrid RF/VLC systems are envisioned as a key enabler to improve the user rates and mobility on the one hand and to optimize the capacity, interference and power consumption of the overall network on the other hand. This paper seeks to provide a detailed survey of hybrid RF/VLC systems. This paper represents an overview of the current developments in the hybrid RF/VLC systems, their benefits and limitations for both newcomers and expert researchers. INDEX TERMS Radio frequency (RF), visible light communication (VLC), hybrid RF/VLC, wireless fidelity (Wi-Fi), hybrid networks, hybrid RF/VLC environments.

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Section: [242]mentioning

confidence: 99%

Section: [242]mentioning

confidence: 99%

Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future Directions

et al. 2021

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“…Zhu et al [12] investigated the joint power, time allocation, and user grouping to minimize the weighted sum of the energy consumption and delay in mobile edge computing systems. Obeed et al [13] proposed the jointly user pairing, link selection, and power allocation for the C-NOMA in hybrid VLC/RF systems.…”

Section: A Related Workmentioning

confidence: 99%

Probability-Based User Management Algorithm for the Hybrid NOMA System

Wang

2021

IEEE Access

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In this paper, a novel hybrid non-orthogonal multiple access (NOMA) system that combines the cooperative NOMA (C-NOMA), original NOMA, and the orthogonal multiple access (OMA) is investigated. The probability-based user management algorithm (PUMA) is proposed for the considered hybrid NOMA system with regard to fulfilling the requirements of the 5G services, which is a joint transmission mode selection and user pairing scheme. The exact coverage and outage probabilities are derived in closed-forms under more realistic network scenarios, involved with the stochastic characteristics of both channel and distance for users. Furthermore, these probabilities are not only utilized in the proposed PUMA, but also can be applied to measure the stochastic geometric performance of the NOMA-related systems. Monte Carlo simulation is executed to verify the mathematical derivations. Simulation results demonstrate that the proposed PUMA possesses higher spectrum utilization, efficiency, and better outage performance in comparison with the random user coordination scheme.INDEX TERMS 5G, coverage probability, hybrid NOMA, outage probability, user pairing.

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“…A large body of work has been produced in the application of NOMA in VLC systems, such as [13]- [16] to name a few. In [13], [14], it was shown that NOMA outperforms the traditional orthogonal frequency division multiple access (OFDMA) scheme in an indoor VLC system model serving multiple users with fixed positions and orientations.…”

Section: B Related Workmentioning

confidence: 99%

“…In [15], NOMA was investigated in a downlink multi-user VLC system with mobile and randomly oriented users, where the sum rate and outage probability were derived. In [16], a system model consisting of one AP serving multiple users simultaneously was established, where users are served using the cooperative NOMA (C-NOMA) scheme.…”

Section: B Related Workmentioning

confidence: 99%

CoMP-Assisted NOMA and Cooperative NOMA in Indoor VLC Cellular Systems

Arfaoui¹,

Ghrayeb²,

Assi³

et al. 2021

Preprint

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In this paper, we investigate the dynamic power allocation for a visible light communication (VLC) cellular system consisting of two coordinating attocells, each equipped with one access-point (AP). The joint-transmission coordinated multipoint (JT-CoMP) between the two cells is introduced to assist users experiencing high inter-cell-interference (ICI), especially the ones located at the edge of both cells, where each cell invokes nonorthogonal-multiple-access (NOMA) to serve its associated users. A power allocation framework is formulated as an optimization problem with the objective of maximizing the network sum-rate while guaranteeing a certain quality-of-service (QoS) for each user. The formulated optimization problem is not concave, which is difficult to be solved directly unless using heuristic methods, which comes at the expense of high computational complexity. To overcome this issue, an optimal and low complexity power allocation scheme is derived. In the simulation results, the performance of the proposed CoMP-assisted NOMA scheme is compared with those of the CoMP-assisted orthogonal-multiple-access (OMA) scheme, the NOMA scheme and the OMA scheme where the superiority of the proposed scheme is demonstrated. Finally, the performance of the proposed scheme and the considered baselines is evaluated while varying the coverage area of each attocell and the distance between the APs.

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User Pairing, Link Selection, and Power Allocation for Cooperative NOMA Hybrid VLC/RF Systems

Cited by 59 publications

References 47 publications

Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future Directions

Hybrid RF/VLC Systems: A Comprehensive Survey on Network Topologies, Performance Analyses, Applications, and Future Directions

Probability-Based User Management Algorithm for the Hybrid NOMA System

CoMP-Assisted NOMA and Cooperative NOMA in Indoor VLC Cellular Systems

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