Abstract
We 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, we 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. Furthermore, the
bit error rate performance of two typical MIMO FSO systems is investigated
over the new turbulence model; an intensity-modulation/direct detection MIMO
FSO system with $Q$-ary pulse position modulation that employs repetition coding at
the transmitter and equal gain combining at the receiver, and a heterodyne
MIMO FSO system with differential phase-shift keying and maximal ratio combining
at the receiver. Finally, numerical results are presented that validate the
theoretical analysis and provide useful insights into the implications of
the model parameters on the overall system performance.
© 2011 IEEE
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