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InfoResearchPeer-reviewed
AmbShield: Enhancing Physical Layer Security With Ambient Backscatter Devices Against Eavesdroppers
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Summary
AmbShield is a physical layer security scheme that uses naturally distributed ambient backscatter devices (AmBDs) to protect wireless links against passive eavesdroppers without extra transmit power. The AmBDs act as friendly jammers that randomly backscatter to interfere with eavesdroppers and as passive relays that backscatter the desired signal to boost legitimate receivers. The authors derive closed-form secrecy outage probability and secrecy diversity order, and validate the gains with Monte Carlo simulations under imperfect synchronization and CSI estimation.