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Free-Space-Optical (FSO) coherent communication is a cost-effective, license-free, high-sensitivity and wide-bandwidth access technique for high date rates applications, whereas its performance strongly suffers from the turbulent atmosphere for the reason of both intensity scintillation and phase fluctuation. In this paper, the intensity scintillation is modeled as a multiplicative random process following the Gamma-Gamma distribution while the phase fluctuation is proved to satisfy Gaussian distribution. The slow varying characteristic of the power spectrum density of the atmosphere is verified.
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