MirrorVLC: Optimal Mirror Placement for Multielement VLC Networks

Mushfique, Sifat Ibne; Alsharoa, Ahmad; Yüksel, Murat

doi:10.1109/twc.2022.3182013

Cited by 8 publications

(7 citation statements)

References 41 publications

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“…The channel model of a VLC system with an LC-based RIS-enabled transmitter characterizes the propagation of light beams from the LED arrays, through the LC-based RIS in front of the LED arrays, and finally through air to the PD of the VLC receiver. The channel gain can be expressed as H = α LC × G LoS , where α LC denotes the LC's transmission coefficient defined in [13] and G LoS is the direct current gain of the LoS propagation [4]. The LC's transmission coefficient can be tuned by optimizing the refractive index of the LC in the presence of an external electric field to control the emerged light direction as revealed in [13].…”

Section: B Channel Model Data Rate and Illumination Expressionmentioning

confidence: 99%

“…The reason is to ensure that the RIS placed in front of the LED arrays does not degrade the illumination properties of the VLC transmitter or cause any health risk. The illumination intensity at a surface inside a room with an LC-based RIS-enabled transmitter can be measured by the surface illuminance which is expressed as [4], [13]…”

Section: B Channel Model Data Rate and Illumination Expressionmentioning

confidence: 99%

“…Recently, a number of studies such as [1], [4], [6], [11]- [13] have investigated the use of optical reconfigurable intelligent surfaces (RISs) to solve the design problems (i) to (iv). In [4], the authors proposed a novel approach of using mirrors to enhance the illumination uniformity and data rate of an indoor multi-cell VLC system. The studies in [1], [11], [12] proposed RIS-aided VLC system models to combat the blockage and random device orientation issues in an indoor environment.…”

Section: Introductionmentioning

confidence: 99%

“…In [6], [13], the authors examined a liquid crystal (LC)-based RIS to enhance signal detection in VLC receivers by performing incident light amplification and light steering. In the studies mentioned above, the considered system models involved the deployment of optical RISs either in the transmission channel [1], [4], [11], [12] or in front of the photodetector (PD) of the VLC receiver [6], [13]. To the best of the authors' knowledge, there has yet to be a study on the application of optical RISs at the transmitter side to boost the coverage and enhance key performance metrics of VLC systems.…”

Section: Introductionmentioning

confidence: 99%

“…The LED array arrangements in Figs. 1 (a) and (b) have been extensively considered in earlier studies on indoor VLC systems such as [2]- [4], [7], [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

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Design and Optimization of Liquid Crystal RIS-Based Visible Light Communication Receivers

et al. 2022

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In the design of reconfigurable intelligent surfaces (RISs)-aided visible light communication (VLC) systems, most studies have focused on the deployment of mirror arrays and metasurfaces on walls to influence signal propagation and enhance communication performance. This paper provides a new research direction in the design and performance optimization of RIS-aided VLC systems whereby voltage-controlled tunable liquid crystals (LCs) are deployed as part of the VLC receiver. The purpose of the LC RIS is to provide incident light steering and intensity amplification in order to improve the received signal strength and the corresponding achievable data rate. More specifically, an LC RIS-based VLC receiver design is proposed and its operating principles and the channel model for a VLC system with such a receiver are provided. Since the refractive index of the LC RIS plays a critical role in the wave-guiding and light amplification capabilities of this novel receiver, a rate maximization problem is considered to achieve the optimal refractive index and the required voltage to obtain the best light amplification and data rate performances. This communication design problem is a non-convex optimization problem for which a metaheuristic approach is developed based on the sine-cosine algorithm. Simulation results are used to confirm the considerable data rate improvement by the proposed LC RIS-based VLC receiver and optimization algorithm when compared to a VLC receiver without the LC RIS and a baseline scheme, respectively.

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Section: B Channel Model Data Rate and Illumination Expressionmentioning

confidence: 99%

Section: B Channel Model Data Rate and Illumination Expressionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The LED array arrangements in Figs. 1 (a) and (b) have been extensively considered in earlier studies on indoor VLC systems such as [2]- [4], [7], [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

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