Based On Ray-tracing Method Of Micro-cellular Cell Radio Wave Propagation Characteristics Of The Study

In order to utilize the frquency resource adequately and increase the capacity of mobile communication system , the wireless electric wave propagation of existing mobile system always adopts the Microcell structure.Forecasting the path loss characteristic of electric wave accurately can provide the necessary condition for the layout and design of wireless network , at the same time it is a precondition for the research on the microcell mobile system.The methods of forecasting of wireless electric wave propagation can divide into two parts: one is pluse and respond , that is establish the empirical model based on experimental and statistical data;the other is ray tracing method ,that is establish the deterministic model based on theoretical analyse.The paper discuss the characteristic of wireless signal electric wave transmition in symmetrical atmosphere of earth,and introduce the common Path Loss transmition model in land mobile communication system,also point out the localization of these models based on experiential methods. With that,the thesis exoatiate on the basic principle , method , its advantages in the study on the characteristic of the microcell based on ray tracing method of determinate analyse means. On this condition, the paper put forward a new electric wave transmition model in the microcell ,which based on ray tracing method of Virtual Fountain Tree. It can be used in any complex environment , can locate all paths from transmitter to receiver which avoid redundant calculation, and it is a standard 3-D forecast model; In addition , it is a point to point ray tracing method based on specular theory which don't carry out the receive test; Furthermore the model adopt the reverse arithmetic which exert the tree concept in data frame and establish a virtual fountain tree permanently, the proagmme can back-search the virtual fountain tree when it is running.These operation increase the calculate speed and it result in the higher receive efficiency and precision.The thesis design a programme to compare the prediction results based on ray tracing method of virtual fountain tree between the measurement results and prediction results based on the other transmittion models.The comparsion result indicate the new model is a better model.