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18 September 2018 Performance of DPSK free-space optical communication with spatial diversity
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The performance of satellite-to-ground downlink optical communications over Gamma-Gamma distributed atmospheric turbulence are discussed for a direct detection differential phase shift keying system with spatial diversity, which combines the beam coherently before demodulation. Bit-error rate (BER) performances for various numbers of apertures are analyzed and compared for different zenith angle. We also consider the effect of the fiber coupling efficiency and loss ratio of beam coupler to the final BER. The results of numerical simulation shows that the advantage increases with the number of aperture. All the numerical results are verified by Monte-Carlo simulations.
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Chenzhe Lao, Jianfeng Sun, Zhiyong Lu, Yu Zhou, Guo Zhang, Guangyuan Li, Bo Zhang, Mengmeng Xu, and Hongyu He "Performance of DPSK free-space optical communication with spatial diversity", Proc. SPIE 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII, 1077010 (18 September 2018);

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