Research On Spectrum Sharing Of High Altitude Platform Network Based On Homogeneous Poisson Point Process

With the development of modern communication technology,High Altitude Platform(HAP)communication has attracted extensive attention of academia and industry.However,there are few researches on multi-HAP networking.This thesis presents a multi-HAP distribution model based on differential geometry and stochastic geometry.In this model,HAP nodes obey the Poisson Point Process(PPP)on the sphere.This thesis uses this model to simulate the distribution of HAP nodes in the real environment.Then,the network performance of this model in different scenarios is analyzed and studied,respectively.The theoretical analysis results in this thesis can provide guidance for the research work of HAP network deployment and resource allocation.The main contents of this thesis are as follows:1)This thesis studies the performance of HAP network and ground network when they share spectrum.The spectrum sharing of HAP network and ground network can improve the spectrum utilization and network capacity of HAP network.On this premise,this thesis uses differential geometry theory to transform the PPP on the spherical model into the PPP on the plane,and obtains the communication success probabilities of HAP users and ground network users respectively.In view of the fact that the heights of HAP nodes will fluctuate in practice,this thesis uses the PPP on the spherical shell to model this scenario,and deduces the communication success probability of HAP users at different heights of HAP nodes.The simulation results show that in order to maximize the network capacity,the height of HAP should be reduced as low as possible within the height range of HAP distribution.2)The performance of HAP network combined with Multiple-Input Multiple-Output(MIMO)technology is studied when it shares the same spectrum with ground network.In this thesis,MIMO technology is introduced into HAP network.Firstly,the communication success probability of HAP users in a single-layer HAP network using MIMO technology is studied.Then,this thesis calculates the communication success probabilities of HAP network users and ground network users when the spectrum of HAP network and ground network is shared.Finally,this thesis deduces the capacity of HAP network,and obtains the relationship between the network capacity and the distribution height of HAP network.3)The performance of the cellular network composed of HAP base stations is studied.In this chapter,combining with the calculation method in the first part,we get the expression of ergodic capacity of HAP network,and further get the spatial spectrum efficiency and spatial energy efficiency of HAP cellular network.The relationship between the spatial spectrum efficiency,the spatial energy efficiency and the radius of cellular network is obtained by simulation.The research results of this thesis promote the theoretical research of HAP network,and it is instructive to the distribution of HAP network.