Abstract
A model for the irradiance probability density function for turbulence
induced fading in free space optical communications is derived. The
derivations are based on expanding on the extended Rytov method by
associating a doubly stochastic process to model large scale
scintillation. In particular, the small scale induced irradiance
fluctuations are modeled by a single gamma distribution, while the
large scale induced fluctuations are modeled as a doubly stochastic
process of gamma and inverted gamma distributions, thus better
approximating the lognormal distribution. The resultant distribution’s
probability density and cumulative density functions are both given in
closed forms. Moreover, the resultant model parameters are given based
on strong scintillation theory. Through comparison with previously
published results and experimental data, including lognormal and
gamma–gamma distributions, it is concluded that the proposed model
agrees well with measurements for weak and strong scintillation
conditions in cases of both aperture averaging and a point like
receiver. Therefore, the proposed model can be used for the
performance analysis of optical wireless systems.
Subject
Computer Vision and Pattern Recognition,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
5 articles.
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