| With the tremendous success of wireless communication technology,various derivative applications based on wireless communication technology make human life no longer limited by time and space.In the past few decades,drones have been widely used in many fields due to their advantages of flexible movement.However,the endurance problem faced by drones has always limited its service range,and how to solve the energy supply problem has become the goal of many research teams.At the same time,the ubiquitous wireless communication system may be abused by malicious users to carry out illegal criminal activities.For the government and other regulatory agencies,maintaining a safe and clean communication environment and implementing effective legal information monitoring measures to lawfully intercept suspicious communication links are crucial.Therefore,in this thesis,the optimal transmission strategy of UAV cooperative relay in wireless communication system is studied.Firstly,a deceptive relay active and lawful listening strategy is adopted to maximize the amount of information transmitted by UAV cooperative relay and effectively contain The phenomenon of illegal information transmission has been eliminated;then,wireless laser equipment is used to provide energy for the drone to extend its life and expand the service range of the drone.This thesis summarizes the main research contents into the following two points:(1)Research on active and lawful interception strategy based on drone collaboration.For the one-to-one illegal communication link,the UAV acts as a legitimate listener to actively intercept the illegal communication link.By establishing a deceptive relay active attack model on the system and combining with the UAV listening channel quality to be superior For the channel conditions of illegal communication links,using mathematical theory and convex optimization technology,through an effective iterative algorithm to optimize the amplification factor,power distribution ratio and the trajectory of the drone listener,to maximize the legitimate listener The amount of interception information on illegal communication links.Through simulation comparison and verification,our proposed optimization algorithm improves the quality of the UAV’s listening channel,and also increases the amount of information intercepted by legal listeners on illegal communication links(2)Research on Maximizing the Information Volume of UAV Relay Auxiliary Communication with Laser Energy Supply Due to the limited endurance of the UAV,we used a laser transmitter to emit a laser beam to continuously charge the fixed-wing UAV in flight.First,the information transmission model of UAV cooperative relay was established,and the relationship between the laser energy received by the UAV and the energy consumption of communication was established.Then,according to the position and number of laser equipment stations and the transmission power,the design was designed.An optimization algorithm that can balance the energy collection and transmission of the largest amount of information,and through effective iterative optimization of the communication scheduling,transmission power,and cooperative relay flight trajectory in the system,we have obtained that the energy control relationship and the maximum amount of transmitted information are obtained.The best drone deployment.Finally,the trade-off relationship is given through the simulation results,and the reliability of the scheme is verified. |
