A Cooperative Scrambling Secure Transmission Method Based on Relay Link Optimal User Selection

Abstract

The present invention relates to a cooperative scrambling secure transmission method based on the optimal user selection of the relay link. In the first time slot, a destination user node based on the maximum receiving signal-to-noise ratio is selected as the legal node based on the link from the relay to the destination user. The user node, other user nodes are used as eavesdropping user nodes; the source node sends information to the relay node and the destination user node, while the legal user node sends an interference signal to the relay node and the eavesdropping user node; in the second time slot , the relay node uses the variable gain amplification and forwarding protocol to amplify the information received in the first time slot, and forwards the information to the destination user node; the legitimate user node continues to send interference signals to the relay node and the eavesdropping user node. The present invention reduces the receiving signal-to-noise ratio of the wiretapping channel through the cooperation between the relay and other nodes, thereby achieving the purpose of ensuring safe transmission of the system.

Description

technical field [0001] The invention relates to the field of wireless communication physical layer security, in particular to a cooperative scrambling secure transmission method based on relay link optimal user selection. Background technique [0002] From the perspective of information theory, physical layer security makes full use of various propagation characteristics of wireless channels to solve information security problems in the communication process at the physical layer. Compared with key encryption, physical layer security has many advantages, such as no need for highly complex algorithms, clear security performance evaluation criteria, and so on. In terms of data security, physical layer security technology has received more and more attention as a supplement or replacement of key encryption technology. By processing information at the physical layer, the security of information can be fundamentally ensured. Therefore, the research on physical layer security is...

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Problems solved by technology

[0005] After investigation, it is found that under the background of the research framework of physical layer security performance, there is research on the combination of cooperative scrambling technology and full-duplex technology, and there is research on the combination of multi-user diversity technology and half-duplex technology, but there is a lack of fusion and cooperation. Research on physical layer security performance of scrambling technology, multi-user diversity technology and full-duplex technology

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