BER Analysis of Cooperative Systems in Free-Space Optical Networks
- 22 September 2009
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 27 (24), 5639-5647
- https://doi.org/10.1109/jlt.2009.2032789
Abstract
Free-space optical (FSO) communication suffers from several challenges in practical deployment; the major of them is fading or scintillation. To overcome such limitations, spatial diversity based on MIMO techniques has been proposed for FSO systems. User cooperation diversity is a new form of spatial diversity which is introduced to overcome some limitations of MIMO structures. Although the promising effects of cooperative transmission in RF communications have greatly been considered so far, there have been a few notable research on cooperative diversity in FSO. In this paper, we first consider a 3-way FSO communication setup, in which the cooperative protocol can be applied to achieve the spatial diversity without much increase in hardware, compared to their regular transmission. Then, we introduce different cooperative strategies and investigate their bit error rate (BER) performance in the presence of shot noise, using the photon-count method. We compare the results with those of the direct path link (non-cooperative scheme) and the two transmitters case, which are the upper and lower bounds on the BER of the cooperative scheme, respectively. The results illustrate the advantages of cooperation under a number of different scenarios for realistic SNRs.Keywords
This publication has 21 references indexed in Scilit:
- Channel coding and time-diversity for optical wireless linksOptics Express, 2009
- Relay-assisted free-space optical communicationIEEE Transactions on Wireless Communications, 2008
- Cooperative diversity over log-normal fading channels: performance analysis and optimizationIEEE Transactions on Wireless Communications, 2008
- BER Performance of Free-Space Optical Transmission with Spatial DiversityIEEE Transactions on Wireless Communications, 2007
- Bootstrapping free-space optical networksIEEE Journal on Selected Areas in Communications, 2006
- Free-Space Optical CommunicationsJournal of Lightwave Technology, 2006
- Free-Space Optical MIMO Transmission With$Q$-ary PPMIEEE Transactions on Communications, 2005
- Cooperative Diversity in Wireless Networks: Efficient Protocols and Outage BehaviorIEEE Transactions on Information Theory, 2004
- User cooperation diversity-part I: system descriptionIEEE Transactions on Communications, 2003
- Laser Beam Scintillation with ApplicationsPublished by SPIE-Intl Soc Optical Eng ,2001