Nonlinear radio frequency fingerprint authentication method of QPSK-OFDM wireless equipment based on demodulation symbol

Abstract

The invention discloses a nonlinear radio frequency fingerprint authentication method of QPSK-OFDM wireless equipment based on a demodulation symbol, and a nonlinear radio frequency fingerprint authentication function is added on the basis of a universal digital communication receiver. The method comprises two kinds of judgment, the first kind of judgment is symbol judgment in general digital communication, the second kind of judgment is communication transmitter judgment of radio frequency fingerprint authentication, the first kind of judgment belongs to the processing category of digital signals, and the second kind of judgment belongs to the processing category of analog signals. A minimum variance unbiased identification technique, referred to as MVUIT, for a Hammerstein system using orthogonal polynomials is used to estimate a composite linear transmission channel, the estimated linear channel is used to equalize subsequent payload symbols, which are used to estimate the nonlinearity of a transmitter by MVUIT, for authenticating a wireless device. Simulation shows that the longer the payload symbol is, the better the correct classification performance is.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a non-linear radio frequency fingerprint authentication method for QPSK-OFDM wireless equipment based on demodulation symbols. Background technique [0002] With the rapid development of the Internet of Things (IOT) and fifth-generation mobile communication technologies, the physical layer security of communication networks has inevitably become a hot topic. Radio frequency fingerprinting (RFF) authentication is one of the methods used for physical layer information security, which relies on the hardware characteristics of the transmitter rather than digital information (such as encryption keys or media access control MAC addresses) to authenticate the real identity of radio devices . Although the a priori digital preambles of communication frames are deterministic, the corresponding analog signals transmitted from different wireless devices are different because their tran...

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Problems solved by technology

In addition, there is a literature that proposes a preamble processing technique that can be used to accurately authenticate IEEE802.15.4 devices, but this technique cannot distinguish between devices with the same type

Additionally, preamble-based RFFs are often short-lived and visible, making them vulnerable to forgery attacks by high-end instruments

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