A full-duplex cooperative scrambling secure transmission method based on optimal user selection of a direct path

Abstract

The invention relates to a full-duplex cooperative scrambling secure transmission method based on optimal user selection of direct path. In the first time slot, the source node sends information to the relay node and the destination user node. At the same time, one user node with the largest signal-to-noise ratio is selected from all the destination user nodes as the legal user node, and the otherdestination user nodes are eavesdropping user nodes. The legal user node sends interference signals to the relay node and destination user node. In the second time slot, the relay node amplifies theinformation received in the first time slot by using the variable gain amplification and forwarding protocol, and forwards the information to the destination user node. The legitimate user continues to send the scrambling signal to the eavesdropping user node. The invention can reduce the receiving signal-to-noise ratio of the eavesdropping channel and ensure the safe transmission of the information.

Description

technical field [0001] The invention relates to the field of wireless communication physical layer security, in particular to a full-duplex cooperative scrambling secure transmission method based on the optimal user selection of the direct path. 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, research on physic...

AI Technical Summary

Problems solved by technology

At present, after conducting relevant investigations, it is found that in the existing research work on physical layer security performance, there is a lack of relevant research work that integrates the three technical solutions of cooperative scrambling technology, multi-user diversity technology and full-duplex technology.

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