Abstract
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.
Highlights
Hong T [15] proposed a design scheme of relay tag antenna based on the genetic algorithm in the Ambient backscatter communications (ABC) environment, which realized the directional communication from the relay tag to the legitimate receiver and enhanced the physical layer security of wireless communication
The Injects artificial noise from the tag end (IANT) scheme proposed in this paper can be summarized as follows: The IANT scheme proposed in this paper can be summarized as follows: (1) In the first sub-slot, K tags sequentially transmit N0 symbols to reader in the order of (1) In thinedfeirxs,tasnudb-tshleotr,eKcetiavgins gseeqnudenoftiraellaydterracnaslmcuitlaNte0ssΦymk abcoclos rtdoirnegadtoerFoinrmthuelaor(d4)e.r of (2i)ndeTxh, eanrdeatdheerrseecleeicvtisngtheendi-tohf arenaddej-rthcatlacguslathesat ΦsaktiasfcycoFrodrimngutloa F(8o)r.mIutlafir(s4t).sends K
In order to evaluate the performance of the IANT scheme proposed in this paper, we compare it with the multi-tag physical layer security scheme proposed by You J team [18] in the ABC system
Summary
Hong T [15] proposed a design scheme of relay tag antenna based on the genetic algorithm in the ABC environment, which realized the directional communication from the relay tag to the legitimate receiver and enhanced the physical layer security of wireless communication. We proposed an enhanced communication security scheme that generates artificial noise from the tag end in the ABC environment. This scheme does not depend on key relay nodes, so the reliability of the system can be improved. In the RFID environment, the conventional method to improve the physical layer security is to inject noise from the reader end, and send the signal with noise to the tag.
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