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., noncolluding 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 an the secrecy performance of the considered HSTRN.