Relay link optimal user selection based collaboration scrambling secure transmission method

Abstract

The invention relates to a relay link optimal user selection based collaboration scrambling secure transmission method. The method comprises the steps of selecting a target user node with the maximumreceiving SNR (Signal-to-Noise Ratio) as a legal user node and other user nodes as eavesdropping user nodes based on a link from a relay to a target user in a first time slot; sending information to arelay node and the target user node by a signal source node meanwhile sending an interference signal to the relay node and the eavesdropping user nodes by the legal user node; by the relay node, amplifying the information received in the first time slot by adopting a changeable grain amplification and forwarding protocol and forwarding the information to the target user node in a second time slot; and by the legal user node, carrying on sending the interference signal to the relay node and the eavesdropping user node. Through collaboration between the relay and the other nodes, the receivingSNR of an eavesdropping channel is reduced and the purpose of guaranteeing system secure transmission is realized.

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 optimal user selection of a relay link. 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 physical layer security i...

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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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