Abstract
The performance of a free-space optical (FSO) communications link suffers from the deleterious effects of weather conditions and atmospheric turbulence. In order to better estimate the reliability and availability of an FSO link, a suitable distribution needs to be employed. The accuracy of this model depends strongly on the atmospheric turbulence strength which causes the scintillation effect. To this end, a variety of probability density functions were utilized to model the optical channel according to the strength of the refractive index structure parameter. Although many theoretical models have shown satisfactory performance, in reality they can significantly differ. This work employs an information theoretic method, namely the so-called Jensen–Shannon divergence, a symmetrization of the Kullback–Leibler divergence, to measure the similarity between different probability distributions. In doing so, a large experimental dataset of received signal strength measurements from a real FSO link is utilized. Additionally, the Pearson family of continuous probability distributions is also employed to determine the best fit according to the mean, standard deviation, skewness and kurtosis of the modeled data.
Highlights
The technology of free-space optical (FSO) communications, after decades of research efforts, seems to be ready to bring a revolution to the area of telecommunications
In [6], the scintillation effect has been modeled by the Gamma–Gamma and the I-K distribution to study the time dispersion and atmospheric turbulence in the performance of an FSO link and closed-form mathematical expressions for the evaluation of the link’s fade probability derived
A large experimentally measured dataset of received signal strength of an FSO link in the maritime environment is utilized and different theoretical probability density functions (PDFs) models are fitted to the entire dataset histogram
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Jose Maria Garrido et al analyzed the performance of an FSO link affected by atmospheric turbulence and line-of-sight (LOS) blockages They modeled the intensity fading due to turbulence using the Malaga distribution and derived a closed-form expression for the outage probability (OP). In [6], the scintillation effect has been modeled by the Gamma–Gamma and the I-K distribution to study the time dispersion and atmospheric turbulence in the performance of an FSO link and closed-form mathematical expressions for the evaluation of the link’s fade probability derived. A large experimentally measured dataset of received signal strength of an FSO link in the maritime environment is utilized and different theoretical PDF models are fitted to the entire dataset histogram.
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