Secrecy energy efficiency optimization for DF relaying IoT systems with passive eavesdropping terminal

Abstract In this paper, we investigate a cooperative Internet of Things (IoT) communication network with decode-and-forward relay nodes that can be eavesdropped, where the relay node harvests energy from the received signal power to charge its battery, which is used to retransmit the received signal to the destination. The secrecy communication of the energy harvesting Gaussian eavesdropping channel has been studied. The expression of secrecy energy efficiency for the cooperative IoT system with a battery-enabled relay has been derived, which depends on energy absorption rate and energy harvesting time. Then we perform analytical and numerical analysis on the performance on secrecy energy efficiency. Our analytical results reveal that the secrecy energy efficiency has a maximum under constraints. Finally, we demonstrate that our proposed model and methods are feasible from simulation results based on proposed secrecy energy efficiency maximization algorithm.

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