Transmission Technology In High-speed Satellite Mobile Communication Based On DVB-RCS

With the continuous development of China's transportation system,the needs of mobile communications including high-speed rail,aircraft,and so on are rapidly growing,and accompanied by a wave of mobile Internet,the need of voice and data services is also growing strongly.Satellite mobile communication as an important part of mobile communication can not only provide high-capacity,wide coverage of mobile communication services,but also constitute a three-dimensional world of mobile communication networks,it can provide special communication services towards to the cars,trains,ships,aircraft and individuals.High-speed rail as an important part of our transportation system,satellite mobile communication system can effectively solve the handoff signal,the Doppler frequency shift and other issues in terrestrial mobile communications system in the face of switching by use its wide coverage capacity characteristics,improve communication reliability and effectiveness.However,high-speed mobile communications satellite transmission technology faces enormous challenges.On the one hand the channel of satellite mobile communication showing the changing state because the high-speed rail and other mobile stations in the process of moving,how to overcome the effects of fading channel for efficient transport of communication is needed to solve.On the other hand,satellite mobile communication system needs to provide high-speed broadband communications services for moving mobile station,which the transmission efficiency of the system put forward higher requirements.In this thesis,based on the satellite mobile communication standard DVB-RCS protocol,specific for high-speed satellite mobile communication system,from three aspects,include establishing the channel model,proposed channel prediction algorithms and efficient transmission technology of signal,research the applied of efficient technology to high-speed mobile communication.The main research work are as follows:(1)Based on the study of DVB-RCS protocol standards and satellite mobile communication channel model,considering the scenes of high-speed railway during movement,analyze different scenarios fading channel,establish appropriate channel model for mobile satellite communication of high-speed railway.Combination with high-speed railway satellite mobile communications channel properties,research the predictability of channel.(2)Based on the analysis of common channel prediction algorithm,combination of high-speed mobile satellite communication channel environment,presents a combination of minimal filtering and Markov state channel estimation algorithm and simulation,further simulation under different state channel prediction effect of error algorithm and different parameters for predicting performance and verify DVB-RCS satellite-based high-speed mobile communication system simulation framework based on applicability channel LMS filtering and Markov prediction algorithm,the simulation results show that the LMS filtering and channel Markov prediction algorithm can get good predictive performance in high-speed mobile satellite communication system.(3)Combined the results of channel model and channel prediction,study the efficient transmission strategy of high-speed mobile satellite communication systems.Based on the principle of low error,high utilization in satellite mobile communication system,propose a high-speed rail for efficient integrated transport policy,including retransmission and variable rate based on the channel prediction coding strategy,simulation analysis system throughput and user quality of service in transport policy to take the proposed simulation,the results shows that the retransmission and predictions based on the channel taken variable rate coding strategy can effectively improve the throughput of the system,and bring the quality of service to enhance the user.