19 April 2013 Exponentiated Weibull fading model for free-space optical links with partially coherent beams under aperture averaging
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Abstract
The recently proposed exponentiated Weibull (EW) fading channel model is assessed with partially coherent beams (PCBs) using the Gaussian Schell-model (GSM) theory. The use of a PCB in free-space optical links has been suggested as an atmospheric turbulence mitigation technique, called transmitter aperture averaging. A wave optics code based on the GSM theory is used to generate a PCB propagating in atmospheric turbulence, and the probability distribution function (PDF) is obtained from the simulated irradiance data. This study on the PDF includes the new proposed EW model in the presence of aperture averaging, in weak-to-strong turbulence regime. Point receiver conditions are also analyzed. For completeness of the study, the Lognormal and the Gamma-Gamma models have also been included in the analysis, allowing for a direct comparison to the EW distribution. Using a least-squares curve fitting algorithm, the EW model always has the best fit to simulated PDF data. Thus, the EW fading channel model proves to be valid for PCBs.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ricardo A. Barrios, Federico Dios, "Exponentiated Weibull fading model for free-space optical links with partially coherent beams under aperture averaging," Optical Engineering 52(4), 046003 (19 April 2013). https://doi.org/10.1117/1.OE.52.4.046003 . Submission:
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