The propagation characteristic of a Gaussian beam through turbulent atmosphere have been studied in the past several
years. The main advantage of Gaussian beam wave model is that the infinite plant wave and a spherical wave are being
included. Non-Kolmogorov spectrum can describe generalized turbulent atmosphere environment. The propagation
properties of Gaussian beam propagating through the turbulent atmosphere described by non-Kolmogorov spectrum are
studied on slant path. The scintillation index is analyzed with the Gaussian beam of different turbulent strength, zenith
angle, φ , and the spectral exponent, α, of non-Kolmogorov, respectively. The effect of the turbulent structure constant
on the ground on sicntillation is notable. The scintillation index reduces remarkably with zenith angle and structure
parameter decrease. At weak turbulenc, scintillation index increases as spectral exponent decreases. The bit error rate
(BER) of a Gaussian beam propagating in non-Kolmogorov atmospheric turbulence channel is estimated on Earth-space
slant path. By comparing the effect of the spectral power with the structure constant on BER at moderate and strong
turbulence, the effect of the spectral power change on BER is small. With turbulence weakening , at the order of
10-15m-2/3 , the relative effect of the spectral power on BER is gradually increase. Hence, at the small structure constant
on the ground, or weak turbulence, the effect of the turbulent spectral power on BER is required to take into account.
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