Wireless energy supply full duplex relay cooperation secret transmission method and system

Abstract

The invention discloses a wireless energy supply full duplex relay cooperation secret transmission method and system, and the method comprises the steps of enabling a relay to receive an energy signaltransmitted by an information source, and carry out the harvesting of energy; enabling the relay to receive the information which is sent by the information source and carries the private signal, forward the information to a legal receiving end by utilizing the harvested energy, and enabling an eavesdropping user to receive the information; calculating a secrecy rate lower bound in an imperfect eavesdropping channel state according to the information received by the legal receiving end and the eavesdropping user; and constructing an optimization problem of maximizing the secrecy rate, calculating an optimal solution of the optimization problem by adopting an iterative convergence optimization method, and performing information secrecy transmission according to the optimal secrecy rate onthe basis that the obtained optimal secrecy rate meets the lower bound of the secrecy rate. According to the method, the secrecy rate is maximized under the condition that the estimation error threshold value of the eavesdropping channel is known, and compared with an existing method, the method not only considers the influence of imperfect acquisition of the state information of the eavesdroppingchannel on information security transmission, but also considers the reuse of energy-limited relay antenna resources.

Description

technical field [0001] The present invention relates to the technical field of communication systems, in particular to a secure transmission method and system for wireless power supply full-duplex relay cooperation. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Physical Layer Security (PLS, Physical Layer Security) is a key technology to ensure the secure transmission of information in future wireless communication systems. Cooperative relay is an important technical means of physical layer security technology. It can build a virtual multi-antenna (MIMO) system with the help of relay nodes, provide more space resources for secure communication systems, realize directional information transmission, and reduce information leakage. But in actual communication, the relay node may be a battery-powered mobile user in the cellular network, so ...

AI Technical Summary

Problems solved by technology

In actual communication systems, in order to achieve effective eavesdropping and not be discovered by legitimate users, eavesdropping users often keep silent or hide their existence, and do not actively feed back or give accurate eavesdropping channel information to legitimate users, so it is difficult for legitimate communication users Obtaining perfect eavesdropping channel state information

This uncertainty factor will lead to serious information leakage and a significant reduction in system security performance.

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