doi:10.16186/j.cnki.1673-9787.2022030036

Received:2022-03-15

Revised:2022-05-16

Online Date:2022-11-14

 Physical layer secrecy analysis of multi-satellite hybrid satellite-terrestrial relay networks(Online)

WANG Xiaoqi1, HOU Zheng2, ZHANG Hanwei3, SHI Chuang4

1.School of Physics & Electronic Information Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China;2.School of Surveying and Land；Information Engineering， Henan Polytechnic University， Jiaozuo  454000， Henan， China;3.Institute of Resources & Environment， Henan Polytechnic University，Jiaozuo  454000， Henan， China;4.Beihang University， Beijing  100191， China

Abstract:Aiming at the information transmission security of reconnaissance, early warning, resource, topographic mapping and space target monitoring satellites, the physical layer secrecy performance of a multi-satellite hybrid satellite-terrestrial relay network (HSTRN) is investigated in this paper, where multiple satellite sources aim to communicate with a destination user via a relay, in the existence of an eavesdropper. The relay is adopted using either amplify-and-forward (AF) or decode-and-forward (DF) protocol to assist the transmission. To take full advantage of the satellite and relay, Shadowed-Rician fading is considered for satellite links while Rayleigh fading is considered for both terrestrial link and eavesdropper link. To evaluate the secrecy performance of the considered network, the accurate analytical expression for the secrecy outage probability (SOP) is derived. In order to get further insights on the achievable diversity order of the system, the asymptotic behavior of SOP expression at high signal-to-noise ratio (SNR) regime is deduced. The throughput of the system is also discussed to evaluate the secrecy performance of the network. Finally, the theoretical results are validated through comparison with simulations and show: (1) The secrecy performance of the considered network gets better with the increase of the satellite number, and with the decreasing severity of the channel fading scenario. (2) The secrecy performances of AF and DF relaying system are different at medium and low SNR regions, while they will get increasingly consistent at high SNR region. (3) The improvement of the channel fading scenario and high SNR can yield to high throughput of the system.

Key words:hybrid satellite-terrestrial relay network;multi-satellite;Shadowed-Rician fading;secrecy outage probability

CLC: TN927