Opportunistic cooperation for FSO links aided by decode and forward relay

User cooperation technique has been employed lately as a means to provide diversity against turbulence induced fading. In this paper, we consider opportunistic user cooperation to further enhance the performance and robustness especially when the link from the source to the relay has a deteriorated quality. The discussion concerns a three-way scenario in which intensity modulation and direct detection are adopted in the transceivers of the source, a decode and forward (DF) relay and the destination. The figure of merit to evaluate is the outage probability and the analysis assumes the presence of Gaussian noise. To substantiate the improvement in performance, we adopt direct transmission and deterministic user cooperation as the benchmarks for comparison through both analytical study and Monte-Carlo simulation.

[1]  George K. Karagiannidis,et al.  Multihop Free-Space Optical Communications Over Strong Turbulence Channels , 2006, 2006 IEEE International Conference on Communications.

[2]  M. Karimi,et al.  BER Analysis of Cooperative Systems in Free-Space Optical Networks , 2009, Journal of Lightwave Technology.

[3]  Maïté Brandt-Pearce,et al.  Optical repetition MIMO transmission with multipulse PPM , 2005, IEEE Journal on Selected Areas in Communications.

[4]  Etty J. Lee,et al.  Part 1: optical communication over the clear turbulent atmospheric channel using diversity , 2004, IEEE Journal on Selected Areas in Communications.

[5]  Deniz Gündüz,et al.  Opportunistic cooperation by dynamic resource allocation , 2007, IEEE Transactions on Wireless Communications.

[6]  F. Pollara,et al.  Capacity of PPM on Gaussian and Webb channels , 2000, 2000 IEEE International Symposium on Information Theory (Cat. No.00CH37060).

[7]  S. Bloom,et al.  The last mile solution: Hybrid FSO Radio , 2002 .

[8]  Murat Uysal,et al.  Error rate performance of coded free-space optical links over strong turbulence channels , 2004, IEEE Communications Letters.

[9]  Joseph M. Kahn,et al.  Markov chain model in maximum-likelihood sequence detection for free-space optical communication through atmospheric turbulence channels , 2003, IEEE Trans. Commun..

[10]  Mohsen Kavehrad,et al.  BER Performance of Free-Space Optical Transmission with Spatial Diversity , 2007, IEEE Transactions on Wireless Communications.

[11]  Baoyu Zheng,et al.  Outage analysis of opportunistic cooperation over rayleigh fading channels , 2009, IEEE Transactions on Wireless Communications.

[12]  Hennes Henniger,et al.  Multiple-wavelength free-space laser communications , 2003, SPIE LASE.

[13]  Chadi Abou-Rjeily,et al.  Cooperative Diversity for Free-Space Optical Communications: Transceiver Design and Performance Analysis , 2011, IEEE Transactions on Communications.

[14]  Zabih Ghassemlooy,et al.  Digital pulse interval modulation for optical communications , 1998 .

[15]  Murat Uysal,et al.  Relay-Assisted Free-Space Optical Communication , 2007, 2007 Conference Record of the Forty-First Asilomar Conference on Signals, Systems and Computers.

[16]  L. Andrews,et al.  Laser Beam Propagation Through Random Media , 1998 .

[17]  Sergio VerdÂ,et al.  Fading Channels: InformationTheoretic and Communications Aspects , 2000 .

[18]  Joseph M. Kahn,et al.  Performance bounds for coded free-space optical communications through atmospheric turbulence channels , 2003, IEEE Trans. Commun..

[19]  Shlomo Shamai,et al.  Fading Channels: Information-Theoretic and Communication Aspects , 1998, IEEE Trans. Inf. Theory.