Fast and Efficient Adaptation Techniques for Visible Light Communication Systems

Hussein, Ahmed Taha; Alresheedi, Mohammed T.; Elmirghani, Jaafar M. H.

doi:10.1364/jocn.8.000382

Cited by 54 publications

(23 citation statements)

References 28 publications

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“…Eight lighting units (also access points) are used to provide adequate illumination in the room according to the EU and ISO standards [14], [15]. To achieve high modulation bandwidth, Laser Diodes (LDs) are used and the white illumination is obtained using four-colours: Red, Yellow, Green, and Blue (RYGB) LDs as in [14], [15], [17], [18], [29]. Lambertian radiation with 70° half power semiangle is assumed to ensure the room is well lit.…”

Section: System Modelmentioning

confidence: 99%

Optimized Resource Allocation in Multi-User WDM VLC Systems

Saeed

Mohamed

Alsulami

et al. 2019

2019 21st International Conference on Transparent Optical Networks (ICTON)

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In this paper, we address the optimization of wavelength resource allocation in multi-user WDM Visible Light Communication (VLC) systems. A Mixed Integer Linear Programming (MILP) model that maximizes the sum of Signal-to-Interference-plus-Noise-Ratio (SINR) for all users is utilized. The results show that optimizing the wavelength allocation in multi-user WDM VLC systems can reduce the impact of the interference and improve the system throughput in terms of the sum of data rates for up to 7 users.

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Section: System Modelmentioning

confidence: 99%

Optimized Resource Allocation in Multi-User WDM VLC Systems

Saeed

Mohamed

Alsulami

et al. 2019

2019 21st International Conference on Transparent Optical Networks (ICTON)

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“…Table I shows the fast adaptation algorithm, more details and explanations about each step can be found in [19]. The fast proposed system, FABS-IR (with 512 holograms), decreases the computation time taken by the classic angle adaptive holograms, from 512 ms to 28 ms.…”

Section: A Hcd-ir Transmittermentioning

confidence: 99%

Uplink design in VLC systems with IR sources and beam steering

2017

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The need for high-speed local area networks to meet the recent developments in multimedia and video transmission applications has recently focused interest on visible light communication (VLC) systems. Although VLC systems provide lighting and communications simultaneously from light emitting diodes, LEDs, the uplink channel design in such a system is a challenging task. In this paper, we propose a solution in which the uplink challenge in indoor VLC is resolved by the use of an Infrared (IR) link. We introduce a novel fast adaptive beam steering IR system (FABS-IR) to improve the uplink performance at high data rates while providing security for applications. The goal of our proposed system is to enhance the received optical power signal, speed up the adaptation process and mitigate the channel delay spread when the system operates at a high transmission rate. The channel delay spread is minimised from 0.22 ns given by hybrid diffuse IR link to almost 0.07 ns. At 2.5 Gb/s, our results show that the imaging FABS-IR system accomplished about 11.7 dB signal to noise ratio (SNR) in the presence of multipath dispersion, receiver noise and transmitter mobility.Index Terms-uplink channel, beam steering IR, delay spread, SNR.

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“…A select the best (STB) algorithm is used (similar to the ones used in Ref. [22]) to select the optimum link between the IR transmitter and receiver (under mobility, this algorithm can be called periodically). The first step is to switch ON each IR source individually.…”

Section: Visible Light Communicationsmentioning

confidence: 99%

Collaborative VLC/IROW Systems

Hussein¹,

Alresheedi²,

Elmirghani³

2017

Visible Light Communications

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Dimming is an important feature of an indoor lighting system where the illumination level can be controlled by the user. Therefore, integrating a visible light communication (VLC) system with an illumination system poses some challenges. One of the main issues is that the light unit should be "ON" all the time to ensure continuous communication. To ensure acceptance and adoption of VLC systems, an important issue should be addressed: how to communicate when the lights are "OFF" or partially dimmed. In this chapter, we propose five new infrared optical wireless (IROW) systems to support VLC systems when the light is totally turned off or significantly dimmed. To take advantage of both VLC and IROW, we introduce and implement the concept of a collaborative VLC/IROW system. In addition, we investigate the impact of partial dimming on the VLC system's performance, and we propose an adaptive rate technique (ART) to mitigate the impact of light dimming. Moreover, in the case of no dimming, the VLC and IROW systems can collaborate to increase the data rate so it is higher than that in the pure VLC system. We have achieved 10 Gbps in an indoor environment, which is a 2Â increase in the data rate compared with a pure VLC system.

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Fast and Efficient Adaptation Techniques for Visible Light Communication Systems

Cited by 54 publications

References 28 publications

Optimized Resource Allocation in Multi-User WDM VLC Systems

Optimized Resource Allocation in Multi-User WDM VLC Systems

Uplink design in VLC systems with IR sources and beam steering

Collaborative VLC/IROW Systems

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