Abstract
This paper explores the secrecy analysis of a multihop hybrid satellite‐terrestrial relay network (HSTRN) with jamming, where one satellite source is aimed at communicating with destination users via multihop decode‐and‐forward (DF) terrestrial relays, in the existence of an eavesdropper. All the destination users are deployed randomly following a homogeneous Poisson point process (PPP) based on stochastic geometry. Each relay operates not only as a conventional DF relay to forward the received signal but also as a jammer to generate intentional interference to degrade the eavesdropper link, considering shadowed‐Rician fading for legitimate link and wiretap link while Rayleigh fading for jamming link. To characterize the secrecy performance of the considered network, the accurate analytical expression for the secrecy outage probability (SOP) is derived. In order to reveal further insights on the achievable diversity order of the network, the asymptotic behavior of SOP expression at high signal‐to‐noise ratio (SNR) region is deduced. Moreover, the throughput of the system is discussed to characterize the secrecy performance. Finally, the theoretical results are validated through comparison with simulation results and show that (1) the secrecy performance of the considered network gets better with the decreasing of the hops and with the decreasing severity of the channel fading scenario, (2) the relay of the network operating as a jammer can provide better secrecy performance without extra network resources, and (3) small hops and high SNR can yield to high throughput of the system.
Highlights
With the development of wireless communication towards high-speed and broadband, there are great challenges for wireless communication to support massive and seamless connection under limited spectrum, while satellite communication has become much popular on account of its high transmission quality, wide coverage at low cost, and easy deployment [1,2,3], and it has various applications in navigation, military defence, disaster response, and other remote or dangerous areas
The secrecy outage probability (SOP) and throughput analysis are examined under various channel settings
It can be observed that the curves of the asymptotic SOP almost overlap with the analytical ones at the moderate and high signal-tonoise ratio (SNR) region
Summary
With the development of wireless communication towards high-speed and broadband, there are great challenges for wireless communication to support massive and seamless connection under limited spectrum, while satellite communication has become much popular on account of its high transmission quality, wide coverage at low cost, and easy deployment [1,2,3], and it has various applications in navigation, military defence, disaster response, and other remote or dangerous areas. Huang et al [20] investigated the secrecy performance of HSTRN by comparing AF and DF protocols, revealing that the system secrecy performance with the DF protocol was always better than that with the AF protocol On this basis, Bankey and Upadhyay [21] studied the physical layer security of a downlink HSTRN with multiantenna satellite, multiple terrestrial destinations, multiple relays, and multiple eavesdroppers. The probability density functions (PDFs) and the cumulative distribution functions (CDFs) of the channel gain between the relay and users are deduced (2) The accurate analytical SOP expression of the considered network is derived (3) The asymptotic behavior of the SOP expression at high SNR region is explored, and the throughput of the system is obtained (4) The simulation is carried out to verify the theoretical results, which reveal that the performance of a multihop HSTRN depends on the hops, secrecy rate, jammer, and shadowing severity of the considered network. J·j denotes the absolute value of a scalar, E1⁄2· denotes the expectation operator, n! symbolizes the factorial of n, f Xð·Þ and FXð·Þ represent the PDF and CDF, respectively, and Pr ð·Þ means the probability for a random variable
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