On Relay Selection for Cooperative Free-Space Optical Communication


Celik Y., Odabasioglu N.

17th European Conference on Networks and Optical Communications (NOC) / 7th Conference on Optical Cabling and Infrastructure (OC&I), Vilanova Geltru, Spain, 20 - 22 June 2012 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • Doi Number: 10.1109/noc.2012.6249953
  • City: Vilanova Geltru
  • Country: Spain

Abstract

In this paper, we propose two different relay selection schemes in free space optical (FSO) systems with decode-and-forward (DF) relaying. We provide closed-form outage probability expression for Selection Cooperation (SC) scheme and Monte-Carlo simulation of Opportuistic Relaying (OR) scheme for a gathered channel model which takes into account both path loss and turbulence-induced log-normal fading. Our analitical and simulation results demonstrate that the proposed SC and OR methods provide 0.5 dB and 4 dB power gains over one relay multi-hop transmission (no relay selection), respectively at a target outage probability of 10(-4) assuming the deployment of three relays in our system model. Moreover, this power gain increases with increasing number of deployed relays in OR scheme.