Security-Reliability Analysis of FSO Communications Over Generalized F Channel

This research paper investigates the security and reliability aspects of a multiuser free space optical (MU-FSO) system when exposed to eavesdropper attacks. The system experiences atmospheric turbulence, specifically generalized Fisher-Snedecor F turbulence, which leads to significant signal fading. To enhance the security and reliability of the MU-FSO system, the study employs three scheduling schemes: optimal scheduling (OS), round-robin scheduling (RS), and cumulative distribution function scheduling (CS). The paper derives precise expressions for the intercept probability (IP) and outage probability (OP) of the MU-FSO system to compare the performance of these opportunistic scheduling schemes considering the impact of atmospheric turbulence and path loss. Additionally, the paper presents simplified expressions for the asymptotic behavior of IP and OP with acceptable accuracy. Numerical results demonstrate how the performance of the MU-FSO system in terms of secrecy and reliability is influenced by factors such as the conditions of the main and wiretap channels, distances between legitimate users, the number of active users, and the power levels of the legitimate and eavesdropping links. Monte Carlo simulations are used to verify the correctness of the numerical results.