On Secure Uplink Transmission in Hybrid RF-FSO Cooperative Satellite-Aerial-Terrestrial Networks

TL;DR

This paper analyzes the secrecy outage probability in a hybrid RF-FSO satellite-aerial-terrestrial network with cooperative relaying and caching, providing a closed-form expression and verifying it through simulations.

Contribution

It introduces a stochastic geometry-based analysis of secrecy outage in hybrid RF-FSO SATNs with caching and cooperative relaying, deriving a closed-form probability expression.

Findings

Closed-form secrecy outage probability derived

Monte-Carlo simulations confirm analytical results

Hybrid RF-FSO links enhance security performance

Abstract

This work investigates the secrecy outage performance of the uplink transmission of a radio-frequency (RF)-free-space optical (FSO) hybrid cooperative satellite-aerial-terrestrial network (SATN). Specifically, in the considered cooperative SATN, a terrestrial source (S) transmits its information to a satellite receiver (D) via the help of a cache-enabled aerial relay (R) terminal with the most popular content caching scheme, while a group of eavesdropping aerial terminals (Eves) trying to overhear the transmitted confidential information. Moreover, RF and FSO transmissions are employed over S-R and R-D links, respectively. Considering the randomness of R, D, and Eves, and employing a stochastic geometry framework, the secrecy outage performance of the cooperative uplink transmission in the considered SATN is investigated and a closed-form analytical expression for the end-to-end secrecy outage probability is derived. Finally, Monte-Carlo simulations are shown to verify the accuracy of our analysis.