Kashani, M. A.Uysal, MuratKavehrad, M.2015-02-012015-02-0120132161-2056https://doi.org/10.1109/ICTON.2013.6602795http://hdl.handle.net/10679/876Due to copyright restrictions, the access to the full text of this article is only available via subscription.In this paper, we propose a new probability distribution function which accurately describes turbulence-induced fading under a wide range of turbulence conditions. The proposed model, termed Double GG distribution, is based on a doubly stochastic theory of scintillation and developed via the product of two Generalized Gamma (GG) distributions. The proposed Double GG distribution generalizes many existing turbulence channel models in a closed-form expression and provides an excellent fit to the published plane and spherical waves simulation data. We finally evaluate the performance of a free-space optical system over the Double GG turbulence channel and derive closed-form expressions for the bit error rate, assuming intensity modulation/ direct detection with on-off keying.enginfo:eu-repo/semantics/restrictedAccessConference paper1500033317830012210.1109/ICTON.2013.6602795Free-space optical systemsFading channelsIrradiancePropagation2-s2.0-84885227217