| In recent years,the global mobile data traffic has increased at a rate of nearly ten times.In response to this trend,while the traditional communication network is fully popularized,the R&D and testing of the full range of 5G network applications are also being carried out steadily.The main deployment scenarios of 5G networks are indoor hot spots and outdoor cells.In outdoor scenes,the understanding of signal propagation characteristics of roads with dynamic vehicles is not complete,and further research is needed.In order to accelerate the overall construction of mobile communication network,the research on the basic theory of communication system has become crucial.Wireless channel is the medium of wireless signal transmission.Establishing a reliable wireless channel model is one of the core technologies to accelerate the implementation of communication network applications.The channel modeling technology based on ray tracing can accurately simulate the wireless channel,which is suitable for the development of modern communication technology.This paper mainly designs a channel model simulation platform based on ray tracing technology,which is mainly used for wireless signal propagation simulation analysis in urban scenes.The simulation platform includes the functions of scene data import,antenna and propagation parameter data setting.Based on this simulation platform,some work on algorithm efficiency optimization and dynamic channel characteristics analysis is done.The main research work is as follows:1.Research the ray tracing algorithm,select the forward ray tracing method as the deterministic channel simulation scheme,design the simulation platform,and realize the functions of urban GIS environmental information import,receiving and transmitting end and transmission process parameter setting,and data statistical analysis.And use Wireless Insite to obtain channel data;Compare the platform simulation results with the platform simulation results in the same scene in the 3.5GHz frequency band to verify the effectiveness of the platform.2.According to the changing characteristics of the visible area of moving scatters in the dynamic scene,a ray tracing acceleration algorithm with dynamic and static visibility separation is designed,and compared with the traditional space partition acceleration method,the advantages of the acceleration algorithm are determined.3.Study the propagation characteristics of Sub6GHz channel in urban dynamic lane environment.The urban street simulation scene including dynamic vehicles is built,and the channel data is obtained using the simulation platform;The variation trend of power delay spectrum,delay spread and angle spread with the moving of scatterers is analyzed when the transmitter and receiver are in different positions;The channel data of Sub6GHz continuous frequency band is obtained by simulation at the interval of 500MHz.The dependence of channel parameters on frequency,such as delay expansion,path loss and angle expansion,is studied. |
