Optical fading analysis considering spectrum of optical scintillation in terrestrial free-space optical channel

This paper proposes a Butterworth-type spectral model of optical scintillation to design a terrestrial free-space optical (FSO) link. It enables us to estimate the power spectral density (PSD) of optical scintillation in a current optical wireless channel when time zone and weather parameters, such as temperature and rainfall intensity, are given. Furthermore, we present the estimated scintillation index values based on the data analysis. We generate time-correlated Gamma random variable with the estimated spectral parameters and scintillation index, and present simulation results on optical fading characteristics such as the level crossing rate (LCR), the average fade duration (AFD), and burst error rate under each given condition.