[1] Ghassemlooy Z, Uysal M, Khalighi M A et al. An overview of optical wireless communications[M]. //Uysal M, Capsoni C, Ghassemlooy Z, et al. Optical wireless communications. Signals and communication technology. Cham: Springer, 1-23(2016).

[2] Anbarasi K, Hemanth C, Sangeetha R G. A review on channel models in free space optical communication systems[J]. Optics & Laser Technology, 97, 161-171(2017).

[3] Alzenad M, Shakir M Z, Yanikomeroglu H et al. FSO-based vertical backhaul/fronthaul framework for 5G wireless networks[J]. IEEE Communications Magazine, 56, 218-224(2018).

[4] Wang H X, Song B, Wu X J et al. Influence of pointing error on bit error rate of free space optics system at sea[J]. Acta Optica Sinica, 36, 0901001(2016).

[5] Song X G, Cheng J L. Joint estimation of the lognormal-Rician atmospheric turbulence model by the generalized method of moments[J]. Optics Communications, 285, 4727-4732(2012).

[6] Epple B. Simplified channel model for simulation of free-space optical communications[J]. IEEE/OSA Journal of Optical Communications and Networking, 2, 293-304(2010).

[7] Yi X, Yao M W. Free-space communications over exponentiated Weibull turbulence channels with nonzero boresight pointing errors[J]. Optics Express, 23, 2904-2917(2015).

[8] Aarthi G, Prabu K, Reddy G R. Aperture averaging effects on the average spectral efficiency of FSO links over turbulence channel with pointing errors[J]. Optics Communications, 385, 136-142(2017).

[9] Cao M H, Wu X, Wang H Q et al. Performance of super Nyquist optical communication system under Gamma-Gamma atmospheric turbulence[J]. Chinese Journal of Lasers, 47, 0906003(2020).

[10] Sun J, Huang P M, Yao Z S. Diversity reception technology in coherent optical communication over Gamma-Gamma atmospheric turbulence channel[J]. Acta Optica Sinica, 38, 0706002(2018).

[11] Samimi H. Distribution of the sum of K-distributed random variables and applications in free-space optical communications[J]. IET Optoelectronics, 6, 1-6(2012).

[12] Jurado-Navas A, Maria J, Francisco J et al. A unifying statistical model for atmospheric optical scintillation[M]. //Awrejcewicz J. Numerical simulations of physical and engineering processes. Croatia: InTech, 181-206(2011).

[13] Li J, Uysal M. Achievable information rate for outdoor free space optical communication with intensity modulation and direct detection[C]//GLOBECOM'03. IEEE Global Telecommunications Conference, December 1-5, 2003, San Francisco, CA, USA., 2654-2658(2003).

[14] Aarthi G, Ramachandra Reddy G. Average spectral efficiency analysis of FSO links over turbulence channel with adaptive transmissions and aperture averaging[J]. Optics Communications, 410, 896-902(2018).

[15] Han L Q, You Y H. Performance of free space optical communication with combined effects from atmospheric turbulence and pointing errors[J]. Acta Optica Sinica, 34, 1106005(2014).

[16] Gappmair W, Hranilovic S, Leitgeb E. Performance of PPM on terrestrial FSO links with turbulence and pointing errors[J]. IEEE Communications Letters, 14, 468-470(2010).

[17] Djordjevic I B, Djordjevic G T. On the communication over strong atmospheric turbulence channels by adaptive modulation and coding[J]. Optics Express, 17, 18250-18262(2009).

[18] Gökçe M C, Baykal Y, Ata Y. Binary phase shift keying-subcarrier intensity modulation performance in weak oceanic turbulence[J]. Physical Communication, 37, 100904(2019).

[19] Samimi H, Azmi P. Performance analysis of adaptive subcarrier intensity-modulated free-space optical systems[J]. IET Optoelectronics, 5, 168-174(2011).

[20] Farid A A, Hranilovic S. Outage capacity optimization for free-space optical links with pointing errors[J]. Journal of Lightwave Technology, 25, 1702-1710(2007).

[21] Jurado-Navas A. Garrido-Balsells J M, Paris J F, et al. Impact of pointing errors on the performance of generalized atmospheric optical channels[J]. Optics Express, 20, 12550-12562(2012).

[22] Chen D, Huang G Q, Liu G H et al. Performance of adaptive subcarrier modulated MIMO wireless optical communications in Malaga turbulence[J]. Optics Communications, 435, 265-270(2019).

[23] Alheadary W G, Park K H, Alouini M S. Bit error rate analysis of free-space optical communication over general Malaga turbulence channels with pointing error[C]//2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), September 4-8, 2016, Valencia, Spain.(2016).

[24] Ansari I S, Alouini M S, Cheng J L. Ergodic capacity analysis of free-space optical links with nonzero boresight pointing errors[J]. IEEE Transactions on Wireless Communications, 14, 4248-4264(2015).

[25] Yang F, Cheng J L, Tsiftsis T A. Free-space optical communication with nonzero boresight pointing errors[J]. IEEE Transactions on Communications, 62, 713-725(2014).

[26] Yang L, Hasna M O, Gao X Q. Asymptotic BER analysis of FSO with multiple receive apertures over M-distributed turbulence channels with pointing errors[J]. Optics Express, 22, 18238-18245(2014).

[27] Wolfram Research. The mathematical functions site, 2008.(2020). http://functions.wolfarm.com