Research On Modeling Of Stochastic Dynamic Wireless Channel Based On Geometry

Wireless channel,the key link in mobile communication system,is an effective transmission of electromagnetic wave from transmitting to receiving media.Additionally,the channel is a concrete representation of this media.It can predict wave propagation by means of mathematical statistics,in order to express complex electromagnetic environment.In terms of the communication system,wireless channel modeling research is critical.With the implementation of the fifth generation(5G)communication technology,the existing channel models are not enough to meet the current diversified mobile communication requirements.At present,there is an urgent need for multi-scene,multi-dimensional and multi-frequency channel models to fill the deficiencies of the existing model base.In order to meet with the urgent demand for wireless channel model in the situation of 5G mobile communication,we study the widely used geometric stochastic modeling method.Finally,we establish two geometry-based stochastic models(GBSM).The main contributions of this thesis are as follows:(1)The research on wireless channel modeling theory is carried out.We analyze the different types of wireless channels and their corresponding basic characteristics.We also study the existing the 3rd Generation Partnership Project(3GPP)and WINNER ? standard channel models,which provide a theoretical foundation for channel modeling.With the current multi scene communication environment,we propose the Device-to-Device(D2D)and Air-to-Ground(A2G)channel models.The calculation method and process of modeling are highlighted.(2)A D2D channel modeling and space-time correlation analysis based on uniform circular arrays is established.We first propose a three-dimensional(3D)two-cylinder GBSM for D2D channel,which is equipped with uniform circular arrays(UCAs).Based on the model,the space-time correlation expression is derived.Then,we analyze the influence of different parameters on space and time correlation of D2D channel at mm Wave frequencies.These parameters are:the number of antenna elements,the azimuth placement angles of antenna,the UCAs radius,and time delay.We also verify the reliability of proposed model by comparing the measurements data.All results will be available for D2D mm wave channel system design in the future.The study results have been published in the proceedings of 2019 IEEE 6th International Symposium on Electromagnetic Compatibility,indexed by EI and won the Best Paper Award.(3)A three-dimensional A2G channel model of Unmanned Aerial Vehicle(UAV)based on Gauss-Markov mobile model was established.a 3D GBSM for A2G channels is proposed.Meanwhile,the Gauss-Markov mobile model is adopted to generate dynamic trajectories.According to different scattering environments,we establish a reference model and a statistical simulation model for A2G channels,and derive their respective time correlation functions.In particular,the purpose of establishing the statistical simulation model is to reduce complexity,and we verify the consistency of the two models.Then,we analyze the dynamic motion scenarios generated by Gauss-Markov process,and their effects on A2G channel correlation.Finally,the good conformities of time correlation curves with the existing measurement data and the sphere model verify the reliability of our proposed models.The study results have been published in the International Journal of Electronics and Communications,which has been indexed by SCI.