Research On The Security Mechanism Of Artificial Noise At The Receiving End Based On Time Reversal

Nowadays,with the rapid development of wireless communication technology,5g gradually enters into people's life,bringing great convenience to people's production and life,but also brings a series of new industry development,such as unmanned vehicle,Internet of vehicles,UAV technology,telemedicine,etc.the security of wireless communication industry is the premise of all development,which attracts scientific researchers all the time eye.Time inversion technology is a wireless communication technology developed in recent years.Its unique space-time focusing performance provides security for wireless communication system,and it will become a hotspot of wireless communication security research.At the same time,artificial noise as a physical layer security technology has also been widely recognized by scholars.Therefore,this paper combines the time inversion technology with the artificial noise at the receiving end to give full play to their characteristics and improve the security of the communication system.The main contents of this thesis are as follows:Firstly,in the case of near end eavesdropping,in view of the problem that the time inversion technology can't guarantee the security in the focus area,a safe transmission scheme of artificial noise combined with time inversion at the receiving end is proposed.This scheme mainly aims at the situation of high correlation between near end eavesdropping legal channel and eavesdropping channel.The space-time focusing of time inversion technology can effectively improve the signal-to-noise ratio of signals received by legal users,SNR)and can ensure that the signal is not eavesdropped outside the focus area of time inversion;at the same time,the receiver artificial noise technology is used to interfere with the eavesdropper in the focus area to ensure the security of the transmission system;finally,the theoretical formula derivation and simulation analysis are carried out for the proposed scheme,which proves that the proposed scheme has better security performance.Secondly,aiming at the security problem of wireless communication energy limited equipment,a scheme of wireless information and power transfer with time inversion and artificial noise is proposed to improve the security of energy limited wireless power supply network.In this scheme,TR technology is applied to multiple antenna sources,and the temporal and spatial focalization of TR technology is used to focus the wireless signal to the target node and increase the energy harvesting;In addition,in the energy limited target node,energy collection self interference artificial noise operation are used to extend the service life of the device and confuse the eavesdropper;Finally,in order to maximize the security performance of the system,Lyapunov algorithm is used to optimize the optimization target of the system,and the experimental simulation results prove the energy efficiency and confidentiality of the proposed scheme.