S. Randel, F. Breyer, S. C. Lee, and J. W. Walewski, Advanced Modulation Schemes for Short-Range Optical Communications, IEEE Journal of Selected Topics in Quantum Electronics, vol.16, issue.5, p.1280, 2010.
DOI : 10.1109/JSTQE.2010.2040808

K. Kiasaleh, Performance of APD-Based, PPM Free-Space Optical Communication Systems in Atmospheric Turbulence, IEEE Transactions on Communications, vol.53, issue.9, p.1455, 2005.
DOI : 10.1109/TCOMM.2005.855009

T. A. Tsiftsis, H. G. Sandalidis, G. K. Karagiannidis, and M. , Optical wireless links with spatial diversity over strong atmospheric turbulence channels, IEEE Transactions on Wireless Communications, vol.8, issue.2, p.951, 2009.
DOI : 10.1109/TWC.2009.071318

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

M. Safari and S. Hranilovic, Diversity gain for near-field MISO atmospheric optical communications, 2012 IEEE International Conference on Communications (ICC), pp.3128-3132, 2012.
DOI : 10.1109/ICC.2012.6364140

M. Safari and M. , Do We Really Need OSTBCs for Free-Space Optical Communication with Direct Detection?, IEEE Transactions on Wireless Communications, vol.7, issue.11, p.4445, 2008.
DOI : 10.1109/T-WC.2008.070637

A. Garcia-zambrana, C. Castillo-vazquez, B. Castillo-vazquez, and A. Hiniesta-gomez, Selection Transmit Diversity for FSO Links Over Strong Atmospheric Turbulence Channels, IEEE Photonics Technology Letters, vol.21, issue.14, p.1017, 2009.
DOI : 10.1109/LPT.2009.2022057

M. R. Abaza, N. A. Mohammed, and M. H. Aly, BER performance of M-ary PPM freespace optical communications with channel fading, Proceedings of the International Conference on High Capacity Optical Networks & Enabling Technologies, pp.111-115, 2011.

X. Zhu and J. M. Kahn, Maximum-likelihood spatial-diversity reception on correlated turbulent free-space optical channels, IEEE Conference on Global Communication, pp.1237-1241, 2000.

M. Safari and M. , Relay-assisted free-space optical communication, IEEE Transactions on Wireless Communications, vol.7, issue.12, p.5441, 2008.
DOI : 10.1109/T-WC.2008.071352

URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=

J. Akella, M. Yuksel, and S. Kalyanaraman, Error analysis of multihop free-space optical communication, Proceedings of the IEEE International Conference on Communication, pp.1777-1781, 2005.

A. Garcia-zambrana, C. Castillo-vazquez, B. Castillo-vazquez, and R. Boluda-ruiz, Bit detect and forward relaying for FSO links using equal gain combining over gamma-gamma atmospheric turbulence channels with pointing errors, Optics Express, vol.20, issue.15, p.16394, 2012.
DOI : 10.1364/OE.20.016394

S. M. Navidpour, M. Uysal, and M. Kavehrad, BER Performance of Free-Space Optical Transmission with Spatial Diversity, IEEE Transactions on Wireless Communications, vol.6, issue.8, p.2813, 2007.
DOI : 10.1109/TWC.2007.06109

N. D. Chatzidiamantis, D. S. Michalopoulos, E. E. Kriezis, G. K. Karagiannidis, and R. Schober, Relay Selection Protocols for Relay-Assisted Free-Space Optical Systems, Journal of Optical Communications and Networking, vol.5, issue.1, p.92, 2013.
DOI : 10.1364/JOCN.5.000092

M. Abramowitz and I. A. Stegun, Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables, 1972.

J. A. Anguita, M. A. Neifeld, and B. V. Vasic, Spatial correlation and irradiance statistics in a multiple-beam terrestrial free-space optical communication link, Applied Optics, vol.46, issue.26, p.6561, 2007.
DOI : 10.1364/AO.46.006561

E. Morgado, I. Mora-jimenez, J. J. Vinagre, J. Ramos, and A. J. Caamano, End-to-End Average BER in Multihop Wireless Networks over Fading Channels, IEEE Transactions on Wireless Communications, vol.9, issue.8, p.2478, 2010.
DOI : 10.1109/TWC.2010.070710.090240

S. Hranilovic, Wireless Optical Communication Systems, 2005.