Secrecy Performance for a Hybrid Satellite-FSO Communication System

Abstract:
With the growing demand for transmission range and quality of communication networks, the satellite communication has attracted wide attention. On the other hand, information security plays an important role in communication networks. Therefore, this study investigates the secrecy performance for a dual-hop satellite and free-space optical (FSO) communication system. Specially, a satellite first sends confidential messages via an intermediate terrestrial relay over a radio frequency link, which decodes the received electrical signal and converts it into an optical signal, and then forwards it to a destination under the wiretapping of an eavesdropper. Assuming the satellite and and FSO channels undergo shadowed- Rician fading and Málaga-distributed atmospheric turbulence fading, the analytical expressions for secrecy outage probability and the probability of strictly positive secrecy capacity are presented and validated by Monte-Carlo simulations.