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Physical Layer Security in IRS-Assisted Cache-Enabled Satellite Communications Networks
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  • Quynh Ngo ,
  • Tran Khoa Phan ,
  • Abdun Mahmood ,
  • Wei Xiang
Quynh Ngo
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Tran Khoa Phan
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Abdun Mahmood
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Wei Xiang
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This paper analyzes the physical layer security performance of cache-enabled hybrid satellite-terrestrial networks with intelligent reflecting surfaces (IRS). Content caches are deployed at both satellite and ground station to help fast content delivery to users. The IRS assists in securing communications from the ground station and satellite to the user against an eavesdropper. The connection probability and the secrecy probability are derived in asymptotic and closed-form expressions for both ground station-IRS-user and satellite-IRS-user links under practical channel models. From the obtained results, the secure transmission probability of the system is evaluated, and then maximized by designing the caching probabilities and the transmission rates. Numerical results verify the accuracy of the analysis and demonstrate the performance gains of having IRS support secure content delivery.
2023Published in IEEE Transactions on Green Communications and Networking on pages 1-1. 10.1109/TGCN.2023.3280118