Research On Cooperative Diversity Of Mobile Terminals Based On GEO Satellite

In recent years,with the development of the global information technology,mobile communication business is developing rapidly.Both People's dependence and requirements on mobile communication are increasing gradually.Satellite mobile communication system has the characteristics of wide coverage,not limited by geographical restrictions,wide communication bandwidth and high transmission capacity,which can cover the land area,sea area and airspace.It has become an indispensable part of the next generation mobile communication system.In satellite mobile communication systems,the relative movement between the satellite and the mobile terminals makes the channel has a complex varying fading.Cooperative diversity technology can effectively resist the fading of the channel without the need to configure additional antennas.Applying it to the satellite mobile communication,it can effectively resist channel fading.So it is of great significance to study the cooperative diversity in satellite mobile communication.In this paper,we first understand the cooperative diversity from the following aspects,cooperative transmission strategy,the combined mode,and the channel model,and then analyze the application of Stackelberg game in cooperation communication.Secondly,the cooperative model of the existing satellite mobile communication is analyzed.The cooperative model is divided into single cooperative relay node model and multiple relay nodes model according to the number of relay.Dividing the existing relay selection strategies into three kinds,the average SNR based selection strategy,the real-time channel quality based selection strategy and the prediction channel based selection strategy.An analysis is made for the three strategies in the research of satellite mobile communication cooperative technology.This paper focuses on the overload problem caused by non uniform load distribution in LEO satellite network,taking the trend that the future satellite mobile communication with the development of multi layer network,a cooperative diversity network model of hybrid GEO-LEO satellite mobile terminal is constructed and a cooperative relay load balancing scheme based on Stackelberg game is proposed.In order to verify the proposed scheme,in matlab2012a environment,simulation comparisons among the cooperative relay load balancing scheme based on Stackelberg game,the load balancing scheme based on cooperative relay and the traditional direct transmission load balancing scheme are conducted.For further verification of the proposed scheme,the performance of the cooperative relay load balancing scheme based on Stackelberg game is analyzed under different fading channel conditions.Simulation results show the effectiveness of the proposed scheme.