Mobile User Connectivity in Relay-Assisted Visible Light Communications

Petr Pešek, Stanislav Zvanovec, Petr Chvojka, Manav Bhatnagar, Zabih Ghassemlooy, Prakriti Saxena

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)
5 Downloads (Pure)


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.
Original languageEnglish
Article number1125
Issue number4
Publication statusPublished - 7 Apr 2018


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