Relay-Assisted OFDM for ultraviolet communications: Performance analysis and optimization

Maryam Haghighi Ardakani, Murat Uysal

Research output: Contribution to journalArticlepeer-review


Ultraviolet (UV) communication enables non-line-of-sight (NLOS) outdoor wireless connectivity and is particularly desirable to relax or eliminate pointing and tracking requirements of infrared links. In comparison to infrared counterparts, UV links are subject to relatively higher path loss as well as intersymbol interference resulting from frequency selective nature of the channel. In this paper, we propose the powerful combination of relay-assisted transmission and multi-carrier architecture based on orthogonal frequency division multiplexing (OFDM). Specifically, we consider a cooperative diversity system with orthogonal cooperation protocol and use DC-biased optical OFDM as the underlying physical layer. We consider both amplify-and-forward (AF) and detect-and-forward (DF) relaying. We investigate the error rate performance of the proposed relay-assisted OFDM UV system under consideration and demonstrate performance gains over point-to-point OFDM UV systems. We further determine optimal power allocation schemes to improve the performance. We also propose a variable-rate UV OFDM system and improve system throughput via bit loading.

Original languageEnglish (US)
Article number7738576
Pages (from-to)607-618
Number of pages12
JournalIEEE Transactions on Wireless Communications
Issue number1
StatePublished - Jan 2017


  • OFDM
  • Optical wireless communication
  • cooperative transmission
  • ultraviolet communication

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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