Research And Development Of Channel Modeling For 5G Satellite Mobile Communication

In recent years,with the increasing maturity of 5G technology,the integrated air-space-ground network has become the future development trend.The integration of 5G and satellite communication networks can give full play to the characteristics of satellite communication,such as wide coverage,long communication distance,and flexible networking,to achieve all-round 5G network coverage in the air,ocean,desert and other places where it is difficult to deploy ground 5G base stations.The channel modeling research and channel characteristic analysis of 5G-oriented satellite mobile communication have become the research hotspot of the current 5G satellite Integration network.Based on the non-terrestrial network channel model proposed in 3GPP TR 38.811,this thesis develops a 5 G-oriented satellite mobile channel modeling and channel simulation platform.On this basis,the correctness of channel modeling is verified,and the characteristics of 5G satellite mobile channels under different frequency bands and elevation angles are studied and analyzed.The main research contents of the thesis are as follows:1.Deep research on transmission characteristics of satellite mobile channel and construction scheme of satellite MIMO communication system.For the analysis of the transmission characteristics of the satellite mobile channel,the whole transmission environment is divided into two parts,the atmosphere and the ground,according to the different forms of signal attenuation,and the transmission characteristics of the signals in these two environments are studied separately.The application of MIMO technology to satellite communication systems faces many limitations.This thesis introduces two construction schemes of satellite MIMO communication system,which are single-satellite dual-polarization scheme and multi-satellite cooperation scheme,and analyzes the advantages and disadvantages of the two schemes.2.Development of 5G satellite mobile channel simulation platform.Based on the non-terrestrial network channel model proposed by 3GPP TR 38.811,this thesis develops a 5G satellite mobile communication channel simulation platform.According to the channel modeling process,the development of the channel simulation platform is divided into different functional modules,including general parameters generation,scenario parameters generation,pathloss calculation,large-scale parameters generation,small-scale parameters generation and channel coefficient generation.The realization process of each module is described in detail.In addition,the Faraday rotation effect in the new characteristics of 5G satellite mobile channels is also analyzed and studied.Faraday rotation is the polarization rotation effect caused by the interaction of electromagnetic waves with the dielectric in the earth’s magnetic field along the path,and only affects the generation of the final channel coefficients in the simulation process.3.Validation of 5G satellite mobile channel model and analysis of channel characteristics.After the channel modeling is completed,it usually needs to be verified to ensure the correctness of the channel model.Based on the developed 5G satellite mobile channel simulation platform,this thesis completes the verification of the channel model and the analysis of the channel characteristics.Firstly,by comparing the simulation results of delay spread and angle spread distribution with theoretical data,the accuracy of 5G satellite mobile channel modeling is verified in both time and space domains.At the same time of model verification,the simulation results of delay spread and angle spread under different satellite elevation angles are also compared and analyzed.Next,the power distribution difference of channel multipath cluster under LOS and NLOS propagation conditions is analyzed through the study of power delay profile,and the influence of frequency band and elevation angle on channel coupling loss is studied and analyzed.Finally,by comparing and analyzing the distribution of channel eigenvalues before and after adding Faraday rotation,the influence level of Faraday rotation effect on the channel in different frequency bands is studied.In summary,this thesis conducts depth research on the transmission characteristics of satellite mobile channels and the construction scheme of satellite MIMO communication systems,and develops a satellite mobile channel simulation platform suitable for 5G communication systems according to 3 GPP TR 38.811.And on this basis,the verification of the 5G satellite mobile channel model and the analysis of the channel characteristics are completed,which provides a reference for subsequent research.