Model Analysis Of The Characteristics Of Radio Propagation With High-Speed Railway Environment

A model analysis of radio propagation with the environments of high-railway wasput forward in this paper. Based on the researeh of former, the fact process throughwhich radio wave was transmitted, propagated, and passed was turned to model, withfoundation of basic characteristics of radio wave which meter wave and micro wave usedin land mobile communication. In addition, commonness of radio propagation indifferent physiognomy, terrain, and closed mobile conditions was turned to parameterwith aim at the geography and man-made circumstance in high-railway. The keystonewas put on the rationalization of parameters in model, and combination with practice.New fading channel model in high-railway would be defined. Finally, emulation wasgiven in research of fading signals and analysis of code error.The model of mobile receiver with high speed was discussed in theory firstly. Thestructure of model was confirmed in introduction step, based on the synthesis construeand discussion. Some important parameters were defind and its practical meaningswere given. Then characteristics of high-railway environment and movement ofhigh-speed locomotive was discussed. For practicality slow fading and fast fading wascombined in one model, in which more parameters such as pattern of antenna, terrain,and distance between base station and locomotive, sensitive of receiver, number of paths,time delay, attenuations. From point of view of radio propagation system, characteristicsof parameters and multipath fading channl, performance of digital signal transition wasinvestigated.Inevitability and random ability of parameters in receiving model was lucubratedunder the impersonality condition. With method of radial tracing, path numbe ofmultipath and angle of incidence, times of reflection, attenuation, and delay werededuced based on the theory of stochastic. Moreover,difference between normal landmobile communication and high-railway communication was point out.Preparatory numerical emulation was put up based on above disussion. Results thatare more valuable were acquired. Moreover the model in this paper could be used foranalysis of kinds of code error and signal distortion under fading channel in the style oftheory.Finally, probability distribution of amplitude and phase of multipath received signalwas analysis. Results show that it is conditional that amplitude is Raleigh fading orRician fading. Multipath channel is naither of them in most hours. And Riciandistribution based on a existing strong wave. Then, fading rate, delay spread wasdiscussed. More useful conclusion was given.In short,the model in this paper would have wide foreground for application inresearch of radio propagation. And good performance in analysis and practical toolswere shown.