Basic-expansion-model-channel-information-based physical layer authentication method

Abstract

The invention discloses a basic-expansion-model-channel-information-based physical layer authentication method. The method comprises: S1, a legal sender A sends a first data packet to a legal receiver B at a first time slot and authentication trusted connection between an emitter and a receiving device is established; S2, a channel from the emitter to the receiving device is fitted by using a basic expansion model and a channel matrix from the legal sender A to the legal sender B is extracted; S3, a sender X sends a second data packet to the legal receiver B at a next time slot, a channel is fitted by using the basic expansion model, and a channel matrix from the sender X to the legal receiver B is extracted; S4, a channel matrix sample is set; and S5, similarity between the channel matrix of the sender X and the channel matrix sample is determined; and if the similarity is larger than or equal to a set threshold value, authentication is done successfully, the channel matrix of the sender X is stored, and the S3 is carried out; and otherwise, the second data packet is abandoned, and the S1 is implemented. According to the invention, the method has characteristics of low complexity, small time delay, and high precision.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a physical layer authentication method based on channel information of a basic extended model. Background technique [0002] Future communication aims to pursue effective and secure communication with more people or smart devices in a wider range of times and places in more diverse forms. At present and in the foreseeable future, there will be more and more network devices and smart terminals densely distributed throughout the communication network. However, the openness of wireless networks and the mobility of smart terminals provide possibilities for network attacks. Physical layer authentication based on channel information is proposed to eliminate the risk of key leakage in key-based authentication methods, while reducing the resource consumption of mobile devices and achieving faster authentication. [0003] As a very important resource, channel information is...

AI Technical Summary

Problems solved by technology

The traditional channel estimation uses the LS / MMSE algorithm and its improved algorithm combined with the interpolation algorithm to estimate the channel information. The interpolation algorithm reduces the estimation performance because it does not consider the channel correlation.

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