Physical layer blind authentication method and system for time-varying fading channel based on belief transfer

Abstract

The invention discloses a physical layer blind authentication method of a time-varying fading channel based on confidence transfer, which is characterized in that a transmitting end transmits a carrier signal to a wireless channel, the carrier signal includes an authentication signal, a pilot signal and an information signal, and the authentication signal is superimposed To the pilot signal, the wireless channel is a time-varying fading channel; the receiving end receives the carrier signal, and performs blind known interference cancellation (BKIC) processing and differential signal processing on the carrier signal to obtain the target authentication signal. In BKIC processing, the target signal is used The priori probability density function and Tanner diagram, the pilot signal is eliminated by the confidence transfer technology; at the receiving end, the reference signal is obtained based on the key and the pilot signal, and the reference signal is differentially processed to obtain the reference authentication signal, and the calculation The correlation between the target authentication signal and the reference authentication signal is used to obtain a test statistic; and the test statistic is compared with a prescribed threshold to determine whether the carrier signal can pass the authentication.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a physical layer blind authentication method and system of a time-varying fading channel based on confidence transfer. Background technique [0002] There are mainly three types of physical layer authentication technologies at present. The first authentication technology is spread spectrum technology (Auth-SS). The basic idea is to use traditional direct sequence spread spectrum or frequency modulation technology. Since different pulses use different frequencies, this This technique needs to sacrifice certain bandwidth for authentication. In addition, a key limitation of Auth-SS technology is that only users with prior knowledge about spread spectrum technology are allowed to participate in the communication. Therefore, the scope of application of this technique is relatively narrow. [0003] The second type is based on time division multiplexing authentication t...

AI Technical Summary

Problems solved by technology

However, this superiority is based on the premise that the computing power of the hostile user is limited. Once the computing power of the hostile user increases, it is very likely to extract or even destroy the authentication information

[0008] It must be mentioned that the performance of the existing Auth-SS technology and Auth-SUP technology degrades severely in time-varying fading channel scenarios

But the reality is that with the increasing number of wireless communication users, the communication environment will become more complex, and the possibility of being interfered will increase. With the increase in the number of urban communication users and the continuous development of cities, simple time The constant fading channel is not enough to describe the current communication environment

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