Color Planning and Intercell Interference Coordination for Multicolor Visible Light Communication Networks

Zhou, Kaixiong; Gong, Chen; Xu, Zhengyuan

doi:10.1109/jlt.2017.2760061

Cited by 27 publications

(24 citation statements)

References 26 publications

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“…Hence, in order to improve the performance of the cell-edge users, various contributions have investigated the variation of time, frequency, or power allocation coordination schemes across the involved attocells [13]- [15]. For instance, multicolor schemes [16], multicarrier-based cell partitioning [17], optimized angle diversity receivers [18], and differential optical detection have been largely investigated in multi-cell VLC networks, showing an improvement on the achievable spectral efficiency compared to the single cell case [19]. However, the aforementioned techniques usually require dedicated receiver or transmitter architectures.…”

Section: A Motivation and Contributionmentioning

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 Motivation and Contributionmentioning

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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“…Considering multi-color transmission, we may need to obtain the filtering gain matrix F [19] with its pth row and qth column element being the power ratio from the transmitter with the pth color to the qth optical filter. Letting N c be the number of colors, we first model the spectrum of the pth (p = 1, .…”

Section: A Channel Modelmentioning

confidence: 99%

Constrained Partial Group Decoding With Max–Min Fairness for Multi-Color Multi-User Visible Light Communication

Zheng

Gong

2019

IEEE Trans. Commun.

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A visible light communication (VLC) system can adopt multi-color light emitting diode (LED) arrays to support multiple users. In this paper, a multi-layer coding and constrained partial group decoding (CPGD) method is proposed to tackle strong color interference and increase the system throughput. After channel model formulation, user information rates are allocated and decoding order for all the received data layers is obtained by solving a max-min fairness problem using a greedy algorithm. An achievable rate is derived under the truncated Gaussian input distribution. To reduce the decoding complexity, a map on the decoding order and rate allocation is constructed for all positions of interest on the receiver plane and its size is reduced by a classification-based algorithm. Meanwhile, the symmetrical geometry of LED arrays is exploited. Finally, the transmitter-user association problem is formulated and solved by a genetic algorithm. It is observed that the system throughput increases as the receivers are slightly misaligned with corresponding LED arrays due to the reduced interference level, but decreases afterwards due to the weakened link gain. Index TermsVisible light communication, multi-layer transmission, constrained partial group decoder, interference cancellation, transmitter-user association. 2 I. INTRODUCTION With the increasing amount of data transmitted via wireless links, the spectrum shortage has become a critical problem for the next generation communication systems. Visible light communication (VLC) has emerged as a competent supplement [1], [2] to radio-frequency communication due to its unique advantages, such as large bandwidth and free of electromagnetic radiation. Combining with its other advantages, such as simple transceiver structures due to its intensity modulation-direct detection (IM-DD) method, VLC has attracted extensive research attentions in recent years [3]-[6].Light emitting diode (LED) array can be adopted to provide required illumination and simultaneously increase the system's data rate [7], [8]. In a multi-user scenario, where each LED and photodiode (PD) pair serves one user, the PD receives not only the desired signal but also the signals from adjacent LEDs as interferences. It is typical that these interferences are strong and thus treating them as noise will penalize the system throughput or even cause a decoding failure. To tackle this problem, interference can be suppressed by designing a resource allocation scheme [9] or aligned [10], [11] via transmitter-side signal processing.One the other hand, it is generally accepted that while a receiver is not interested in decoding the messages from interferers, decoding them is often beneficial for recovering the desired message [12]. Multi-layer coding and group decoder [13] provide an interference cancellation framework that exploits this benefit. At the transmitter, each data stream is split into multiple layers that are encoded individually using independent codebooks, followed by an LED sending the superposition of t...

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“…where s = 0, 1, … , n and s ≠ p. Here, s j represents the angle of transmission from sth LED and, using (7), can be written as…”

Section: Interference Analysismentioning

confidence: 99%

“…In the literature, various techniques have been proposed for interference mitigation. In other related works, the concept of frequency reuse has been proposed to reduce the interference in VLC where different colors are modulated to carry signal in neighboring LEDs. This reduces the interference between adjacent LED cells and improves the system performance.…”

Section: Introductionmentioning

confidence: 99%

Interference mitigation technique with coverage improvement in indoor VLC system

Shashikant

Garg

Sharma

2018

Trans Emerging Tel Tech

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We consider an indoor visible light communication system in which an arbitrary number of light‐emitting diodes are transmitting the information to the users. Due to the circular field of view of the light‐emitting diode transmitters, there is always a trade‐off between the coverage and interference at the receiving end. Any approach to increase the coverage area increases the overlapping area of two or more field of views resulting in severe interference at the receiver. In this paper, we propose a method that simultaneously reduces the interference due to multiple sources in an indoor visible light communication system and improves the coverage area. The signal‐to‐interference ratio (γSIR)–based approach is used for analyzing the outage and error performances. Specifically, the effect of the proposed method is investigated on various performance metrics such as signal‐to‐interference ratio, coverage probability, and bit error rate. The effect of ambient light on system performance is also incorporated in the analysis.

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Color Planning and Intercell Interference Coordination for Multicolor Visible Light Communication Networks

Cited by 27 publications

References 26 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

Constrained Partial Group Decoding With Max–Min Fairness for Multi-Color Multi-User Visible Light Communication

Interference mitigation technique with coverage improvement in indoor VLC system

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