A Lightweight Radio Frequency Fingerprint Extraction Scheme for Device Identification

The physical layer (PHY) security technology based on radio frequency (RF) fingerprint can effectively solve the secure access problem of wireless devices. The hardware impairments of the devices can be used to generate the unique RF fingerprint to identify different wireless devices. Fingerprint extraction as a key step in the process of identification faces the challenges of ensuring the identification accuracy with reduced sample dimension and low testing and training time. To address the above problems, we propose a lightweight RF fingerprint extraction scheme to extract the physical layer attributes and effectively reduce the data dimension and time consumption. Based on the proposed RF fingerprint, the Bayesian classifier is used to identify the wireless devices. Furthermore, a joint judgment strategy is proposed to improve the identification accuracy by using multiple segments of one signal frame. The experimental result shows that, compared to the existing RF fingerprint identification schemes, the proposed RF fingerprint identification scheme obtains the best identification accuracy with lower time and data consumption.