Research On Optimized Transmission Strategy Based On UAV Information Collection Systems

Due to the characteristics of fast movement and wide coverage,drones have great potential to improve the performance of communication systems.In recent years,with the rapid development of electronic science and materials science,the cost of manufacturing drones has continued to decline,and drones have gradually been used in various industries,such as traffic control,cargo transportation,aerial photography,public rescue,etc.Drone wireless communication has also received widespread atten-tion.However,the UAV auxiliary communication system still faces many challenges,one of the most severe challenges is the life of the UAV.In the UAV auxiliary infor-mation collection scenario,due to the limited battery capacity of the UAV,during the mission,it must be returned to the air regularly to charge the fuselage or replace the battery,which also makes the energy consumption of the UAV appear during the en-tire communication period.It is very precious,so I have to consider reducing the flight energy consumption of the drone as much as possible while completing the necessary communication tasks,thereby increasing the life time of the drone.On the one hand,studying drone communication is to realize the inherent needs of drone su-pervision and create low-altitude digitalization.On the other hand,compared with the traditional land communication system,the UAV auxiliary communication system has the advantages of high flexibility,easy deployment and low cost.Therefore,using drones as a platform for aerial base stations can increase the capacity of the wireless network,expand the communication coverage of the system,and implement low-cost,on-demand communication services.In addition,in areas with weak communication infrastructure or disaster-affected areas,communication systems based on UAV as-sistance can quickly establish communication links,that is,UAV communication can also play an important role in emergency communication.In addition,UAV-assisted wireless communication provides more design dimensions.Compared with traditional ground communication,it can further improve the energy efficiency of the system under the premise of ensuring communication quality.In UAV communication,the energy consumption of the UAV is an important factor for energy efficiency optimi-zation of the communication system.Intuitively,if the drone is as close to the ground terminal as possible to obtain a better ground-to-air channel,the transmission energy required by the ground terminal to transmit the target data in the uplink can be re-duced.But this solution will cause the UAV to consume more propulsion energy.Based on the wireless communication system of fixed-wing and rotary-wing ground terminals and drones,this article focuses on the above aspects,and the main research content and innovations are summarized in the following scenarios:1.Joint trajectory optimization and power control strategy in UAV air-to-ground communicationA circular trajectory UAV information acquisition system was studied,consider-ing the energy consumption and task completion time of the system jointly.Due to the game relationship between the communication energy consumption of the ground terminal and the flight propulsion energy consumption of the UAV,it is necessary to design a suitable flight strategy based on energy considerations and mission require-ments.By combining the dichotomy and cyclic iteration methods,we have obtained two flight schemes,namely the minimum energy consumption of the system and the minimum energy consumption of the ground terminal.2.A kind of auxiliary communication system for rotor unmanned aerial vehi-cles(UAV)was studied in the wireless communication over the users.One of the rotor unmanned aerial vehicles was sent to collect information trans-mitted by users to multiple ground users.In addition,considering the multiple access method of OFDMA,and the LoS communication link is established between the drone and the ground user,while ignoring the Doppler effect caused by the movement of the drone,our goal is to minimize the advancement Energy,including the total en-ergy consumption of drones and communication-related energy,also meets the com-munication throughput requirements of each user.To this end,we first deduced the analysis and propulsion power consumption model of the rotary-wing UAV,and then formulated the maximum and minimum flight of the UAV by jointly optimizing the UAV trajectory and the user's transmission power distribution and the total task com-pletion time User throughput issues.In addition,the original problem is decomposed mainly to solve the non-convexity of the modeling problem.Then the SCA convex optimization method is adopted to transform the original problem into a convex problem,and finally an effective iterative algorithm is proposed.The effectiveness and convergence performance of the algorithm are explained,and the convergence performance of the algorithm with different iteration times and maximizing minimum throughput is also given.The simulation results realize the design scheme of the communication between the rotor UAV and the user,and the feasibility and effec-tiveness of the algorithm are verified by the system modeling and simulation results.