[1] [1] Hu Qingsong, Huang Yuhua, Wang Junbo, et al. Performance analysis of multi-hop free space optics over strong turbulence[J]. Acta Optica Sinica, 2013, 33(9): 0906004.

[2] [2] Shou Qin, Zhang Tao, Wang Han. Analysis of BER performance in free-space optical MIMO-OFDM communication systems over the Gamma-Gamma atmospheric turbulence[J]. Laser & Optoelectronics Progress, 2013, 50(2): 020602.

[3] [3] Zhou Zhongmou, Chen Zhikai. Experimental study of MIMO wireless optical communication diversity reception system[J]. Electronic Design Engineering, 2015, 23(23): 145-148.

[4] [4] Zhang Huiying, Li Hongzuo, Xiao Dongya, et al. Performance analysis of spatial-diversity reception over combined effects of atmospheric turbulence[J]. Chinese J Lasers, 2016, 43(4): 0405002.

[5] [5] Ke Xizheng, Liu Mei. Diversity reception technology over atmospheric turbulence channels in wireless optical communication[J]. Acta Optica Sinica, 2015, 35(1): 0106005.

[6] [6] Boludaruiz R, Garcíazambrana A, Castillovázquez B, et al. Impact of nonzero boresight pointing error on ergodic capacity of MIMO FSO communication systems[J]. Optics Express, 2016, 24(4): 3513-3534.

[7] [7] Safari M, Uysal M. Relay-assisted free-space optical communication[J]. IEEE Transactions on Wireless Communications, 2008, 7(12): 5441-5449.

[8] [8] Peppas K P, Stassinakis A N, Nistazakis H E, et al. Capacity analysis of dual amplify-and-forward relayed free-space optical communication systems over turbulence channels with pointing errors[J]. Journal of Optical Communications and Networking, 2013, 5(9): 1032-1042.

[9] [9] Abou C. Achievable diversity orders of decode-and-forward cooperative protocols over Gamma-Gamma fading FSO links[J]. IEEE Transactions on Communications, 2013, 61(9): 3919-3930.

[10] [10] Chu Hongfa, Niu Kai, He Zhiqiang, et al. A new optimal transfer matrix algorithm designed for MIMO AF relay system with precoding[J]. Journal of Beijing University of Posts and Telecommunications, 2011, 34(S1): 41-45.

[11] [11] Kazemlou S, Hranilovic S, Kumar S. All-optical multihop free-space optical communication systems[J]. Journal of Lightwave Technology, 2011, 29(18): 2663-2669.

[12] [12] Kashani M, Rad M M, Safari M, et al. All-optical amplify-and-forward relaying system for atmospheric channels[J]. IEEE Communications Letters, 2012, 16(10): 1684-1687.

[13] [13] Wang J Y, Wang J B, Chen M, et al. Performance analysis for free-space optical communications using parallel all-optical relays over composite channels[J]. IET Communications, 2014, 8(9): 1437-1446.

[14] [14] Yang L, Gao X, Alouini M S.Performance analysis of relay-assisted all-optical FSO networks over strong atmospheric turbulence channels with pointing errors[J]. Journal of Lightwave Technology, 2014, 32(23): 4011-4018.

[15] [15] Han Liqiang, You Yahui. Performance of free space optical communication with combined effects from atmospheric turbulence and pointing errors[J]. Acta Optica Sinica, 2014, 34(11): 1106005.

[16] [16] Adamchik V S, Marichev O I. The algorithm for calculating integrals of hypergeometric type functions and its realization in REDUCE system[C]. Proceedings of the International Symposium on Symbolic and Algebraic Computation, 1990: 212-224.

[17] [17] Han Liqiang, You Yahui. Performance analysis of all-optical dual-hop free-space optical communication systems[J]. Laser & Optoelectronics Progress, 2016, 53(5): 050101.