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Sensors 2018, 18(4), 1125; https://doi.org/10.3390/s18041125

Mobile User Connectivity in Relay-Assisted Visible Light Communications

1
Department of Electromagnetic Field, Faculty of Electrical Engineering, Czech Technical University in Prague, 2 Technicka, 16627 Prague, Czech Republic
2
Department of Electrical Engineering, Indian Institute of Technology Delhi, Hauz Khas, IN-110016 New Delhi, India
3
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.
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)
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Abstract

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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