Abstract
We propose a method to obtain the maximum likelihood (ML) parameter
estimation of the Γ-Γ (\Γ-\Γ) distribution representing the free space optical (FSO) channel
irradiance fluctuations. The proposed method is based on the expectation maximization
(EM) algorithm and the generalized Newton method using a non-quadratic approximation.
The numerical results show that, for all turbulence conditions, the proposed
ML method is more accurate than the fractional moments (FMOM) method and the
numerical ML method (two dimensional numerical maximization of log-likelihood
function using the Nelder-Mead algorithm). Moreover, the proposed ML is a
fast and stable iterative method, because the iterations always converge to
the global optimum with high convergence rate.
© 2013 IEEE
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