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Open AccessArticle

Mobile User Connectivity in Relay-Assisted Visible Light Communications

Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 2 Technicka, 16627 Prague, Czech Republic
Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, IN-110016 New Delhi, India
Optical Communications Research Group, NCRLab, Faculty of Engineering and Environment, Northumbria University, NE1 8ST Newcastle upon Tyne, UK
Author to whom correspondence should be addressed.
Sensors 2018, 18(4), 1125;
Received: 14 February 2018 / Revised: 28 March 2018 / Accepted: 4 April 2018 / Published: 7 April 2018
(This article belongs to the Special Issue Visible Light Communication Networks)
In this paper, we investigate relay-assisted visible light communications (VLC) where a mobile user acts as a relay and forwards data from a transmitter to the end mobile user. We analyse the utilization of the amplify-and-forward (AF) and decode-and-forward (DF) relaying schemes. The focus of the paper is on analysis of the behavior of the mobile user acting as a relay while considering a realistic locations of the receivers and transmitters on a standard mobile phone, more specifically with two photodetectors on both sides of a mobile phone and a transmitting LED array located upright. We also investigate dependency of the bit error rate (BER) performance on the azimuth and elevation angles of the mobile relay device within a typical office environment. We provide a new analytical description of BER for AF and DF-based relays in VLC. In addition we compare AF and DF-based systems and show that DF offers a marginal improvement in the coverage area with a BER < 10–3 and a data rate of 100 Mb/s. Numerical results also illustrate that relay-based systems offer a significant improvement in terms of the coverage compared to direct non-line of sight VLC links. View Full-Text
Keywords: amplify-and-forward relaying; cooperative communication; decode-and-forward relaying; visible light communications amplify-and-forward relaying; cooperative communication; decode-and-forward relaying; visible light communications
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Pešek, P.; Zvanovec, S.; Chvojka, P.; Bhatnagar, M.R.; Ghassemlooy, Z.; Saxena, P. Mobile User Connectivity in Relay-Assisted Visible Light Communications. Sensors 2018, 18, 1125.

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