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The authors propose the inverse Gaussian distribution, as a less complex alternative to the classical log-normal model, to describe turbulence-induced fading in Free-Space Optical (FSO) systems operating in weak turbulence conditions and/or in the presence of aperture averaging effects. By conducting goodness of fit tests, they define the range of values of the scintillation index for various Multiple-Input Multiple-Output (MIMO) FSO configurations, where the two distributions approximate each other with a certain significance level.
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