Blind authentication method and system for frequency selective fading channel based on smoothing technology

Abstract

The invention discloses a blind authentication method of a frequency selective fading channel based on smoothing technology, which includes transmitting a carrier signal to a frequency selective fading channel with multiple paths, the carrier signal includes an authentication signal, a pilot signal and an information signal, and the authentication The signal is superimposed on the pilot signal; the carrier signal is received, and the carrier signal in each path is sequentially processed by Blind Known Interference Cancellation (BKIC) to obtain the target signal, and the target signal is differentially processed to obtain the target authentication signal, BKIC processing Using adjacent symbols, eliminate the pilot signal through smoothing technology; obtain the reference signal based on the key and pilot signal, perform differential signal processing on the reference signal to obtain the reference authentication signal, and calculate the correlation between the target authentication signal and the reference authentication signal The test statistic is obtained; and the test statistic is compared with a prescribed threshold, so as 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 blind authentication method and system of a frequency selective fading channel based on smoothing technology. 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 technolo...

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 has to be mentioned that the performance of the existing Auth-SS technology and Auth-SUP technology degrades severely in frequency selective 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 Invariant fading channels or simple time-varying fading channels are not enough to describe the current communication environment

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