Abstract
In this paper, novel analytical closed-form expressions are
derived for the probability density function of the sum of identically
distributed correlated gamma-gamma random variables that models an
optical atmospheric channel communication with receiver spatial diversity.
The mathematical expressions here proposed provide a general procedure
to obtain information about the scintillation effects induced by turbulence
over a diversity reception scheme implementing equal-gain combining
method. Both, validity and accuracy of the obtained statistical distribution
are corroborated by comparing the analytical results to numerical results
obtained by Monte-Carlo simulations. These simulations are particularized
for constant, exponential and circular correlation models, corresponding
to three different receivers spatial configurations. In addition, the extreme
situations of no correlation and fully correlated received signals are also
studied. The presented expressions lead to a simple and easy-to-compute
analytical procedure of analyzing atmospheric optical communications
systems with correlated spatial diversity.
Original language | English |
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Journal | Optics Express |
Volume | 22 |
Issue number | 18 |
Number of pages | 14 |
ISSN | 1094-4087 |
Publication status | Published - 2014 |
Externally published | Yes |
Keywords
- Atmospheric propagation
- Atmospheric turbulence
- Free-space optical communication
- Scintillation