Performance of heterodyne differential phase-shift keying system over double Weibull free-space optical channel

In this paper, the bit error rate (BER), outage probability, and outage rate analysis of the heterodyne differential phaseshift keying system over double Weibull-distributed free-space optical channel (FSO) are proposed. The channel statistics are modeled based on the scintillation theory and derived as the product of two independent Weibull random variables. Novel closed-form expressions for evaluating BER, outage probability, and outage rate are derived taking into account the effect of turbulence strength and inner-scale turbulent cell size. Numerical results are provided to evaluate the FSO system performance for weak to strong turbulence channel conditions and inner-scale turbulent cell size. The BER, outage probability, and outage rate performance are displayed for different values of turbulence strength conditions, inner-scale values and signal-to-noise ratios.