Joint Detection of Visible Light Communication Signals Under Non-Orthogonal Multiple Access

Guan, Xun; Yang, Qing; Chan, Chun-Kit

doi:10.1109/lpt.2017.2647844

Cited by 36 publications

(27 citation statements)

References 8 publications

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“…Moreover, a hybrid NOMA-OFDM system was investigated and shown to exhibit superior performance in terms of the achievable rate over OMA-OFDM systems [63], [64]. Likewise, for uplink NOMA-based VLC communications, joint detection was proposed in [65] to decode the messages of multiple users. It is noted here that although NOMA is efficient for scenarios where the number of users is higher than the number of available orthogonal resources, its complexity grows proportionally and rapidly to the number of users.…”

Section: Noma In Vlcmentioning

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: Noma In Vlcmentioning

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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“…This class consists of the techniques that allow an AP or set of APs to distribute defined resources across a set of users. It is divided into two further categories: [18,73,74] Differential detection (DD) [75] Spatial light modulators (SLM) [67] Orthogonal multiplexing (WDM) [53][54][55] AP placement and configuration [43][44][45][46] Beam control and steering [32,[47][48][49][50][51][52]68] Multiple access techniques (TDMA, OFDMA, CDMA) [19][20][21] Precoding (ZF, MMSE) for MU-MISO NOMA [29][30][31][33][34][35][36][37][38][39][40][41][42] [ [22][23][24][25][26][27][28] MA-SP MA-PHY spatial diversity multiple access -Spatial diversity. This class encompasses both of the PHY and SP cases and is concerned with receiving data by many spatially unique channels or multiple PDs then performing signal processing to have them de-correlated.…”

Section: Interference Management Techniquesmentioning

confidence: 99%

Interference in multi-user optical wireless communications systems

Abdalla

Rahaim

Little

2020

Phil. Trans. R. Soc. A.

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Visible light communications (VLC) (including LiFi) represent a subset of the broader field of optical wireless communications. Where narrow beams, typical of free space optical communications are largely free from interference. VLC encompasses use cases involving combined illumination and data access and supporting a wireless access point (AP) model. The use of many units provides scaling of spatial coverage for both lighting and data access. However, AP replication in close proximity creates many interference challenges that motivate the investigation embodied in this paper. In particular, we frame the interference challenge in the context of existing strategies for driving improvements in link performance and consider the impacts of multiple users, multiple sources and multiple cells. Lastly, we review the state of existing research in this area and recommend areas for further study. This article is part of the theme issue ‘Optical wireless communication’.

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“…However, because of the different interferences caused by multi-cell PD-NOMA for each edge user, the principle of proximity access may not be available. It means that the situation where the user group nearer to LED i connects to LED j may exist in a non-negative (10).…”

Section: User Groups In Overlap Areamentioning

confidence: 99%

“…With the aforementioned assumption, if user γ * can receive better signal quality with respect to LED j at a greater distance, (9) would require a positive value, leading to the violation of the principle of proximity access. When a uniform power allocation, that is one of the schemes of fixed power allocation, is done, a positive condition is established in (10). Hence, the compact sufficient condition that guarantees Q 1 , Q 2 , Q 3 ≥ 0 can be indicated in (11).…”

Section: Sufficient Condition Based On Visible-light Channelsmentioning

confidence: 99%

“…Other than the traditional orthogonal multiple access (OMA) schemes, we have focused on other schemes, solving the multi-cell user association. On the one hand, enhanced multiple access schemes, such as the hybrid power domain sparse code multiple access [9,10], guarantee that the users in overlap area can demodulate the signal or improve the signal quality, where these enhanced schemes attempt to fundamentally eliminate the ICI in the overlap area. On the other hand, distributed resource allocation schemes are developed [11][12][13][14], where interference mitigation is performed by the power allocation.…”

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confidence: 99%

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Performance analysis of user association strategy based on power-domain non-orthogonal multiple access in visible light communication multi-cell networks

Tao

et al. 2020

J Wireless Com Network

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A multi-cell visible light communication (VLC) network with non-orthogonal multiple access (NOMA) introduces an inter-cell interference (ICI), which causes poor experience of overlap-area user association. In this study, we focus on the strategic analysis of user association in multi-cell NOMA-VLC networks and reveal the relationship between the performance of user association and visible-light cell deployment. First, we establish the model of power-domain NOMA in multiple cells of VLC. Second, when the principle of proximity access (PPA) considers channel attenuation, we present the violation of the principle of proximity access (VPPA) based on signal-to-interference-plus-noise ratio (SINR) and derive a closed-form sufficient condition for overlap-area users based on the visible light channels. Third, based on the sufficient condition, we perform the strategic analysis of user association in two cases, i.e., the scenario probability with different numbers of users and the probability of the ratio of channel gains with an edge user are deduced. In addition, we evaluate the performance of user association by the deployment of lighting angles and inter-cell distance. Finally, the simulation results indicate that the VPPA achieves better data rate performance than the PPA based on the sufficient condition. Furthermore, the probability distributions in numerical results show that the situations with the VPPA reach a certain scale of occurrence probability.

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Joint Detection of Visible Light Communication Signals Under Non-Orthogonal Multiple Access

Cited by 36 publications

References 8 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

Interference in multi-user optical wireless communications systems

Performance analysis of user association strategy based on power-domain non-orthogonal multiple access in visible light communication multi-cell networks

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