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Secure transmission in satellite-assisted multiple relay networks under multiple eavesdroppers with hardware impairments
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OA
AI
S
Sai LiL
Liang YangY
Yuna JiangY
Yusheng Sun DOI：10.23919/jcn.2025.000111.png)
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Abstract
En 中文
Satellite-assisted relay networks (SaRNs) can provide wide-area coverage and enhance communication capabilities in remote or complex environments. In this paper, we investigate the physical layer security of SaRNs in multiple-relay and multiple-eavesdropper scenarios, and the effects of hardware impairments (HIs), eavesdropper mobility, and imperfect channel state information (CSI) are considered. Specifically, a SaRN transmission framework with the mixed decode-and-forward satellite/terahertz (THz) link is proposed, where the satellite link transmits information from a geosynchronous earth orbit (GEO) satellite to relays, while the THz links support communication between relays and indoor users. Two wiretapping cases are analyzed: Case I, where the eavesdroppers overhear the satellite-to-relay (S-R) transmissions; and Case II, where the eavesdroppers intercept both the S-R and relay-to-destination (R-D) transmissions. For two wiretapping cases, expressions of secrecy outage probability (SOP) and average secrecy capacity (ASC) under HIs, eavesdropper mobility, and imperfect CSI conditions are derived separately. The results show that the secrecy performance is related to the number of relays and eavesdroppers, HIs level, eavesdropper mobility, channel conditions, and the antenna configuration. Moreover, for the ideal cases of ideal hardware, static eavesdropping, and perfect CSI, we obtain exact expressions for SOP and ASC in terms of the Fox's H-function and their corresponding asymptotic results. The asymptotic analysis shows that the diversity gain of the system under both cases depends on the number of relays and parameters of the THz links.
Keywords:
Hardware impairments
multiple eavesdroppers
multiple relays
physical layer security
satellite-assisted relay network
Journal
J
IF:
3.2
Papers:
47
Citations:
0
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Cited Papers