Research On Transmission Strategy And Resource Scheduling For Satellite-Terrestrial Coordination

The development of science and technology has expanded the field of human activities.In addition to plains,hills and other areas inhabited by humans,deserts,oceans,skies and even space are gradually becoming areas of human activity.With the expansion of the field of activities,the scope of human communication has gradually changed from ground to the full range of space,sky,ground and sea.Limited by the deployment of ground infrastructure,the existing terrestrial cellular mobile network can no longer meet the needs of human communication in the omni-directional space.Satellite,as a communication facility that can achieve wide-area coverage and flexible deployment,has become the best solution to achieve seamless global communication.Due to the inherent technical challenges and complex environment,satellite communication develops slowly.The explosive growth of data traffic and diversified communication services have brought great challenges to traditional satellite communication.How to achieve truly global seamless high-speed network service and meet the diversified service demands is an urgent issue in satellite communication.The main research direction of this dissertation is how to improve the transmission efficiency of satellite-terrestrial communication system to meet modern diverse communication service demands.It mainly researches the communication resource allocation of heterogeneous information under the satellite-terrestrial heterogeneous network.In addition,it also researches the precoding design of multi-beam satellite in multicast transmission.In view of the current diversity of communication services,this dissertation establishes a satisfaction function which refers to the service type characteristics,communication transmission rate,and communication cost.Then using the satisfaction function assists the resource allocation of satellite-terrestrial network system.Finally,the system's resource allocation plan is given through matching algorithm and convex optimization theory.Compared with the traditional rate-based resource allocation scheme,the algorithm proposed in this dissertation can improve user satisfaction with communication services to a greater extent.When satellites solely provide services to ground users,due to limited spectrum and power resources,satellites have to improve resource utilization efficiency and provide users with high-speed communication services.To solved this problem,this dissertation takes high-capacity multi-beam satellites as the research background,and uses multicast transmission to improve resource utilization efficiency.Specifically,facing the problem of inter-beam frequency interference caused by frequency sharing,this dissertation proposes a multicast precoding scheme to reduce inter-beam interference and increase the transmission rate of the system.In summary,this dissertation investigates the efficient transmission of different types of services by satellite,and proposes practical solution,to lay a solid theoretical foundation for future satellite communications and air-space-ground integrated networks.