Outage Probability of Free Space Optical Communication over Atmosphere Turbulence

Free space optical communications have potential applications in the future global communication network. However, performance of free space optical communication is degraded by atmospheric turbulence. In this paper, we derive closed-form expressions of outage probability for the cases when the scintillation is lognormal probability ditribution over weak atmospheric turbulence channels and gamma-gamma probability ditribution over moderate-to-strong atmospheric turbulence channels, which cover a wide range of atmospheric turbulence conditions. We simulate the system outage probality from weak turbulenc to moderate-to-strong turbulenc. Numerical results are provided to evaluate the performance of free space optical communication between turbulence strength and threshold.