Comments on “Simple Generation of Gamma, Gamma–Gamma and K Distributions With Exponential Autocorrelation Function”

Abstract

This paper is a comment on Simple generation of gamma, gamma-gamma and K distributions with exponential autocorrelation function”. The original article states that the simulation of a free-space optical (FSO) communication channel in the presence of strong turbulence typically requires the generation of channel states with a K or gamma-gamma distribution and a predefined autocorrelation function. In the comment it is concluded that the resulting autocorrelation function for gamma-gamma and K processes may be approximated as a simple exponent only under certain constraints on distribution parameters. Whenever these constraints are not met, the resulting autocorrelation function is still analytically tractable, but it is no longer a simple exponent.