Relay-Assisted OFDM-Based Visible Light Communications

Refik Caglar Kizilirmak, Omer Narmanlioglu, Murat Uysal

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

In this study, we investigate a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source. Specifically, we consider two light sources in an office space: one is the information source employed on the ceiling and the other one is a task light. Our system uses dc biased optical orthogonal frequency division multiplexing (DCO-OFDM) where the task light performs relaying to assist the communication and operates in half-duplex mode for both amplify-and-forward and decode-and-forward relaying. We investigate the bit error rate (BER) performance of the relay-assisted VLC system and optimize the performance through optimal ac/dc power allocation under illumination constraints. The dc power allocation is determined by sharing the number of LED chips between the terminals to satisfy a desired luminance ratio. The ac power allocation decides the fraction of the information signal power to be consumed at the terminals in order to minimize the BER. Numerical results reveal that cooperation brings significant performance gains over direct transmission. We further provide comparisons of two relaying techniques under consideration and discuss the effect of clipping noise on the error rate performance.

Original languageEnglish
Article number7180320
Pages (from-to)3765-3778
Number of pages14
JournalIEEE Transactions on Communications
Volume63
Issue number10
DOIs
Publication statusPublished - Oct 1 2015

Fingerprint

Orthogonal frequency division multiplexing
Light sources
Bit error rate
Communication systems
Ceilings
Light emitting diodes
Luminance
Lighting
Communication
Visible light communication

Keywords

  • cooperative communication
  • OFDM
  • Visible light communication

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Relay-Assisted OFDM-Based Visible Light Communications. / Kizilirmak, Refik Caglar; Narmanlioglu, Omer; Uysal, Murat.

In: IEEE Transactions on Communications, Vol. 63, No. 10, 7180320, 01.10.2015, p. 3765-3778.

Research output: Contribution to journalArticle

Kizilirmak, Refik Caglar ; Narmanlioglu, Omer ; Uysal, Murat. / Relay-Assisted OFDM-Based Visible Light Communications. In: IEEE Transactions on Communications. 2015 ; Vol. 63, No. 10. pp. 3765-3778.
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