[1] [1] KARIM M, NASIRI-KENARI I M. Outage analysis of relay-assisted free-space optical communications ［J］. IET Communications, 2010, 4(12): 1423-1432.

[2] [2] SAFARI M, UYSAL M. Cooperative diversity over log-normal fading channels: performance analysis and optimization ［J］. IEEE Transactions on Wireless Communications, 2008, 7(5): 1963-1972.

[3] [3] FARID A A, HRANILOVI S. Outage capacity optimization for free-space optical links with pointing errors ［J］. Journal of Lightwave Technology, 2007, 25(7): 1702-1710.

[4] [4] CHAKRABORTY K. Capacity of the MIMO optical fading channel ［C］. Information Theory, 2005 ISIT 2005 Proceedings International Symposium, 2008: 530-534.

[5] [5] WANG H Q, CAO M H, CHEN H Y, et al.. Channel capacity of optical multiple input multiple output system without background noise ［J］. Acta Optica Sinica, 2012, 32(3): 0306003-1.(in Chinese)

[6] [6] ANDREWS L C, PHILLIPS R L. Laser Beam Propagation Through Random Media ［M］. Bellingham: SPIE Press, 2005.

[7] [7] ANGUITAJ A, NEIFELD M A, VASIC B V. Spatial correlation and irradiance statistics in a multiple-beam terrestrial free-space optical communication link ［J］. Applied Optics, 2007, 46(26): 6561-6571.

[8] [8] XIAO SH F, HANG K ZH, ZHONG ZH, et al.. Spatial correlation analysis of MIMO channel in indoor visible light communication ［J］. Journal of Electronics & Information Technology, 2014, 36(9): 2117-2123.(in Chinese)

[9] [9] OZBILGIN T, KOCA M. Inter-aperture correlation in MIMO free space optical systems［J］. Optics Communications, 2015, 353: 139-146.

[10] [10] SHEN H, FAN CH Y. Influence of channel correlation on the signal scintillation with spatial diversity receiver ［J］. Infrared and Laser Engineering, 2015, 44(8): 2523-2527.(in Chinese)

[11] [11] ZHU X M, KAHN J M. Free-space optical communication through atmospheric turbulence channels ［J］. IEEE Transactions on Communications, 2002, 50(8): 1293-1300.

[12] [12] NAVIDPOURS M, UYSAL M, KAVEHRAD M. BER performance of free-space optical transmission with spatial diversity ［J］. IEEE Transactions on Wireless Communications, 2007, 6(8): 2813-2819.

[13] [13] KAUSHIK C, SUBHRAKANTI D, MASSIMO F. Outage capacity of MIMO possion fading channels ［J］. IEEE Transactions on Information Theory, 2008, 54(11): 4887-4907.

[14] [14] GAGLIARDIR, KARP S. M-ary poisson detection and optical communications ［J］. IEEE Transactions on Communication Technology, 1969, 17(2): 208-216.

[15] [15] CHAN H H, STERCKX K L, ELMIRGHANI J M H. et al.. Performance of optical wireless OOK and PPM systems under the constraints of ambient noise and multipath dispersion ［J］. IEEE Communications Magazine, 1998, 36(12): 83-87.

[16] [16] WU N, WANG X, DAI H. Performance of indoor visible light systems using OOK and PPM modulations under multipath channels ［C］. Optical Wireless Communications(IWOW), 2013 2nd International Workshop on, 2013: 84-88.

[17] [17] WILSONS G, BRANDT-PEARCE M, CAO Q, et al.. Free-space optical MIMO transmission with Q-ary PPM ［J］. IEEE Transactions on Communications, 2005, 53: 1402-1412.

[18] [18] TSIFTSIST A, SANDALIDIS H G, KARAGIANNIDIS G K, et al.. FSO links with spatial diversity over strong atmospheric turbulence channels ［J］. 2008 IEEE International Conference on Communications, 2008: 5379-5384.

[19] [19] CHURNSIDE J H, CLIFFORD S F. Log-normal Rician probability density function of optical scintillations in the turbulent atmosphere ［J］. J. Opt. Soc. Am. A, 1987, 4(10): 1923-1930.

[20] [20] KIM I I, HAKAKHA H, ADHIKARI P. Scintillation reduction using multiple transmitters ［J］.SPIE, 1997, 2990: 102-113.

[21] [21] WILSONS G, BRANDT-PEARCE M, CAO Q, et al.. Optical repetition MIMO transmission with multipulse PPM ［J］. IEEE Journal on Selected Areas in Communications, 2005, 23: 1901-1910.

[22] [22] LUO T, LE G X. Principle and Application of Multi-antenna Wireless Communication ［M］.Beijing: Beijing University of Posts and Telecommunication Press, 2005: 63-64.(in Chinese)

[23] [23] CRISTOFF M, BJORN O. Asymptotic eigenvalue distributions and capacity for MIMO channels under correlated fading ［J］. IEEE Transactions on Wireless Communications, 2004, 3(4): 1350-1359.

[24] [24] ABU-DAYYA A A, BEAULIEU N C. Outage probabilities in the presence of correlated lognormal interferers ［J］. IEEE Transactions on Vehicular Technology, 1994, 43(1): 164-173.