Research On Physical Layer Security In UAV Communication

The flexible mobility of UAVs can be used to improve the performance of wireless communication systems.Therefore,it has been widely studied in recent years,and the broadcast characteristics of wireless channels have an impact on the security performance of wireless communication systems.Eavesdropping is a Urgently needed to solve the problem,physical layer security technology as a supplement to the traditional anti-theft measures,has also received a lot of attention.Therefore,this paper combines UAV-assisted wireless communication technology with physical layer security technology.In wireless communication,the essence of the improvement of secure communication performance is the differentiation of the wireless channel,that is,the legal channel condition is better than the eavesdropping channel as much as possible,and the flexible mobility of the drone can make it pass close to or away from the receiving end.To change the channel state,which can effectively improve the security performance of the system.This paper combines UAV communication technology and physical layer security technology to study the physical layer security of UAV-assisted wireless communication systems.The main research content can be summarized as:(1)In a scenario where an eavesdropping user exists,the drone transmits information to the target user as a source.Due to the threat of eavesdropping users,the drone source needs to properly evade the eavesdropping of the user to improve the security performance of the system.Based on this situation,this paper designs a reasonable flight path and selects the appropriate transmission power to improve the security performance of the system by considering the optimization of the transmission power and flight path of the UAV.Based on the convex optimization algorithm,an effective algorithm is designed to achieve an optimal trade-off between the security capacity and the energy consumption,that is,the system's confidential energy efficiency is maximized.At the same time,the simulation proves that the algorithm can significantly improve the system security efficiency.(2)In a scenario where multiple eavesdropping users exist and the location isuncertain,the UAV forwards the information of the source node to the target node as a relay.Because there are multiple eavesdropping users,the drone relay needs to properly plan the flight path to reduce eavesdropping and improve the security performance of the system.In this paper,by analyzing the eavesdropping caused by eavesdropping users in multiple uncertain locations,jointly optimizing the transmission power and flight trajectory of the UAV,a robust algorithm can significantly improve the confidentiality rate of the system and solve the eavesdropping user.The problem of improved security performance in the case where the location is not fixed.The simulation results show that the algorithm can effectively improve the confidentiality rate of the system.In summary,the introduction of UAV communication technology and physical layer security technology in wireless communication,by properly planning the flight path and optimizing the transmission power,can significantly improve the security performance of the system.