A Physical Layer Security Enhancement Scheme under the Ambient Backscatter System

In this paper, we proposed a scheme that Injects artificial noise from the tag end (IANT) to enhance the physical layer security of the ambient backscatter communication (ABC) system. The difference between the ABC system and the traditional radio frequency identification system is whether it uses the radio frequency (RF) signals in the environment to supply energy and modulation information for passive tags. In the IANT scheme, we select the best tag to communicate with the reader according to the channel quality between tags and reader, and at the same time select another tag to generate artificial noise that affects the receiving effect of the eavesdropper. This paper uses the method of generating noise copies in the reader to reduce the interference of artificial noise on the signal received by the reader. The simulation results show that with the increase in channel quality between tags and reader and the increase in the number of tags, the proposed IANT scheme is significantly superior to the contrast scheme in terms of system achievable secrecy rate, effectively enhancing the physical layer security of the ABC system.

Automated summary

This paper proposed a scheme to enhance the physical layer security of the ambient backscatter communication (ABC) system by injecting artificial noise from the tag end (IANT). The scheme selects the best tag to communicate with the reader based on channel quality and another tag to generate artificial noise to disrupt eavesdroppers. By generating noise copies in the reader, the interference of artificial noise on the received signal is reduced. Simulation results demonstrate the superiority of the proposed IANT scheme in achieving system secrecy rate and enhancing physical layer security.