文档介绍:年 第 期 光 通 信 研 究
202 1 1
总第 期 henhe Energy Engineering Technology Company,Shanghai 200233 ,China)
Abstract
:Lognormal channel is a powerful mathematical tool in modeling fading effects for wireless optical communications o-
ver weak turbulence ,exact analysis involving lognormal channels involves mult-i fold integrals,which re-
veal little insights into the relation between the system performance and the channel ,Wilkinson Ap-
proximation (WA)and Fenton Approximation (FA)are widely applied to approximate the performance of lognormal fading
,their ranges of applications are not fully studied,which causes discrepancies in performance evaluations.
In this work,we compare WA and FA based on the expressions of moments,and propose an approach to approximate the per-
formance of Free-Space Optical Communications (FSO)relaying systems over the lognormal weak turbulence channels,and
discuss the ranges of applications for WA and is shown that at low and medium Signa-l to-Noise Ratio (SNR),error
probability approximation based on WA is more ,at large SNR,Fenton’s approach will provide better ap-
proximation accuracy compared to the results indicate that the approximation error depends