Multi-User Visible Light Communications: State-of-the-Art and Future Directions

Al-Ahmadi, Saad; Maraqa, Omar; Uysal, Murat; Sait, Sadiq M.

doi:10.1109/access.2018.2879885

Cited by 72 publications

(59 citation statements)

References 183 publications

(188 reference statements)

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“…It is also worth noting that uplink VLC scenarios are impractical due to the power limitations of portable devices and the unpleasant radiance produced by end users. So, it is expected that the current VLC technologies will rely on RF or infrared communications for the uplink wireless transmissions [49]- [51]. Consequently, most of the research efforts on NOMA in VLC systems have focused on the downlink scenario.…”

Section: A Backgroundmentioning

confidence: 99%

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

Naser

Sofotasios

Bariah

et al. 2020

IEEE Open J. Veh. Technol.

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The increased proliferation of connected devices requires a development of innovative technologies for the next generation of wireless systems. One of the key challenges, however, is the spectrum scarcity, owing to the unprecedented broadband penetration rate in recent years. Based on this, visible light communication (VLC) has recently emerged as an effective potential solution for enabling high-speed short-range communications. Yet, despite their undoubted advantageous features, VLC systems suffer from several limitations which constraint their capabilities. As a result, several multiple access (MA) techniques, such as space-division multiple access (SDMA) and non-orthogonal multiple access (NOMA), have been considered in VLC networks as an effective approach, among others, to circumvent these limitations. However, despite their achievable multiplexing gain, their overall performance is still limited compared to the overall potential of this technology. Motivated by this, the presented article offers two contributions: firstly, we provide an overview of the key MA technologies used in VLC systems and then we introduce rate-splitting multiple access (RSMA), and discuss its capabilities and potentials in VLC systems. Secondly, through realistic system modeling and simulations of an RSMA-based two-user scenario, we illustrate the flexibility of RSMA as well as its superiority in terms of the achievable weighted sum rate over NOMA and SDMA in the context of VLC. Finally, we discuss technical challenges, open issues, and research directions, along with the offered results and insights that are expected to be useful towards the effective practical realization of RSMA in VLC configurations.

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Section: A Backgroundmentioning

confidence: 99%

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

Naser

Sofotasios

Bariah

et al. 2020

IEEE Open J. Veh. Technol.

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“…T HE increasing mobile data use and emerging new applications in fifth generation (5G) and beyond networks require peak data rates in the order of Gigabits per second. This motivated the move from the current congested radio bands to higher frequency bands such as millimeter wave (mm-wave) band [1], THz, and even visible light communications (VLC) bands [2]. For example, the recently licensed 28 GHz and 38 GHz bands offer more than one GHz of bandwidth which allows service providers to expand the transmission bandwidth more than the current 4G networks [1].…”

Section: Introductionmentioning

confidence: 99%

On the Achievable Max-Min Rates of Cooperative Power-Domain NOMA Systems

Al-Ahmadi

2020

IEEE Access

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The non-orthogonal multiple access (NOMA) schemes, where the users are allowed to share the same time-frequency resource, have recently received a major interest to meet the increasing demands for higher data rates, improved user fairness, and/or lower latency dense-user applications in future wireless networks. Moreover, the achievable user rates of NOMA schemes can be further increased through the integration of these multiple access schemes with other enabling schemes such as full-duplex user cooperative communications. In this paper, the optimization of the achievable max-min rates for full-duplex cooperative NOMA schemes for the two-user scenario are re-visited and extended to the three-user scenario where novel expressions for the optimal user cooperation power are derived for both scenarios. The obtained results shed new lights on the optimal transmit power allocation and the optimal user cooperation power allocation in cooperative NOMA (CNOMA) systems and the different design trade-offs in such systems. INDEX TERMS Non-orthogonal multiple access schemes, cooperative communications, user cooperation, max-min rate, power allocation.

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“…Multi-user (MU) VLC system design has been the subject of extensive research in the recent literature. Considering the general context of VLC applications, a general overview of the MU VLC techniques was presented in [2]. Also, a survey of different MA techniques for VLC applications was provided in [3] and [4].…”

Section: Introductionmentioning

confidence: 99%

Multiple Access Techniques for VLC in Large Space Indoor Scenarios: A Comparative Study

Eltokhey

Khalighi

Ghassemlooy

2019

2019 15th International Conference on Telecommunications (ConTEL)

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The growing demand for high speed indoor wireless connectivity is among the driving forces for data transmission based on visible-light communications (VLC). For relatively large-space indoor scenarios, the development of appropriate spectrally-efficient multiple-access (MA) techniques enables efficient handling of multiple users, in particular, in dealing with the limited modulation bandwidth of the light-emitting diodes. In this paper, we present a comparative study between different MA techniques proposed in the recent literature for VLC networks. The most appropriate schemes for large-scale network deployments are further investigated in different scenarios to contrast their performance in terms of the achievable throughput.

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Multi-User Visible Light Communications: State-of-the-Art and Future Directions

Cited by 72 publications

References 183 publications

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

Rate-Splitting Multiple Access: Unifying NOMA and SDMA in MISO VLC Channels

On the Achievable Max-Min Rates of Cooperative Power-Domain NOMA Systems

Multiple Access Techniques for VLC in Large Space Indoor Scenarios: A Comparative Study

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