Research On Outage Probability Of UAV Relay Channel Based On Mobile Model Optimization

"Unmanned aerial vehicle(UAV)" is short for unmanned aircraft,which is a kind of unmanned aircraft that use wireless remote control equipment or airborne automatic control system to complete the autonomous flight control.Because it is unmanned aircraft,therefore,UAV can perform high risk tasks in some extreme environments,which not only to ensure t he completion of the task but also to avoid casualties.At the same time,UAV as a communication relay,relative to the ground communication station,it can move freely and fly higher,so its deployment is more flexible and communication radius is greater;Relative to the satellite communication,it has lower cost and deployment is more convenient.What's more,its communication delay is shorter,and has less interference.In view of the advantages of UAV relay communication and the wide application of UAV in military and civil affairs,therefor the research of UAV relayed mobile model is very important,which plays an important role in the optimization of network performance.However,there are many UAV relay mobile models,it is very difficult to select a suitable mobile model.Based on the original UAV relay model,the optimization of the UAV relaying mobile model is carried out and the outage probability of the optimized mobile model is studied in this dissertation.This dissertation studies the three kin ds of UAV relay mobile model,namely UAV single Chain-Relay mobility model with fixed data rate,UAV Conveyor-Belt relay mobile model under fixed data rate and UAV single Chain-Relay mobility model with variable data rate.Among them,the former two kinds of mobile models are available,and the third model is the optimization model that is proposed in this dissertation.Each of the end-to-end delay time and throughput expressions are deduced for the three mobile models,and the simulation results show that under the same parameters,the end-to-end delay time of UAV single Chain-Relay mobility model with variable data rate is the shortest and the throughput is the largest,that is to say,UAV single Chain-Relay mobility model with variable data rate is the be st among the three mobile models.On this basis,this dissertation also studies the outage probability of the UAV single Chain-Relay mobility model with variable data rate.Different from traditional method used to solve the outage probability,this disser tation considers the height difference between the UAV and the ground stations,UAV's flight parameters(such as UAV's azimuth,pitching angle,flight distance and spacing between transmitting antennas,etc.)as well as some practical factors such as the interference of the external circumstances,so the channel of the UAV single Chain-Relay mobility model is regarded as Rician channel.For the Rician channel,the average channel capacity and outage probability of the Rician channel are derived and simulated separately,and the outage probability of the complete link(including ground-to-air link and the air-to-air link)is derived and simulated.The simulation results show that the average channel capacity and outage probability are related to the flight para meters of UAV,and with the increase of the data rate R,the outage probability of system increases,and eventually approaches 1.