Ergodic secrecy capacity analysis of multiuser hybrid satellite-terrestrial relay networks with multiple eavesdroppers

Abstract

In this paper, we analyze the physical layer security performance of a downlink multiuser hybrid satellite-terrestrial relay network (HSTRN), where a multi-antenna satellite communicates with the best selected terrestrial user via an amplify-and-forward relay in the presence of multiple eavesdroppers. Particularly, we investigate the ergodic secrecy capacity (ESC) performance of the considered network by adopting Shadowed-Rician fading for the satellite link and Nakagami-m fading for the terrestrial links. More importantly, we carry out the ESC performance analysis under two wiretapping scenarios, viz., non-colluding and colluding eavesdroppers, by making use of moment generating function transform. Numerical and simulation results elucidate the accuracy of our theoretical findings and highlight the impact of various system/channel parameters on the secrecy performance of the considered HSTRN. © 2019 IEEE.