3D Modeling And Simulation Of Obstructed Small Space Wireless Propagation Channel

With the rapid development of the information technology field,in order to realize the commercialization of the fifth generation communication system as soon as possible,the application research of various basic theories has emerged endlessly,and higher requirements have been put forward on the important link in the wireless system design of electromagnetic simulation calculation.Modeling wireless channels in closed rooms,such as closed rooms,plays a very important role in many applications.Compared with the propagation characteristics of electromagnetic waves in outdoor environments,confined small space scenes are more complex and changeable,and electromagnetic waves are easily affected by various environmental factors such as obstacles.In some occasions where efficient wireless communication is required,it is necessary to establish an accurate closed-space wireless channel propagation model.The channel modeling in this environment not only needs to obtain the large-scale fading of wireless propagation,but more importantly,to study the accurate small-scale fading model.This paper adopts the deterministic modeling method in electromagnetic simulation calculation-forward ray tracing algorithm.The small-scale fading propagation characteristics and large-scale fading propagation characteristics of electromagnetic waves in the 26 GHz millimeter wave frequency band are studied in a small space environment similar to an enclosed room.A ray tracing 3D simulation platform suitable for high frequency wireless communication is built.This article first specifically analyzes the wireless channel propagation characteristics of 26 GHz high-frequency signals and the four spatial propagation mechanisms that may occur during propagation: reflection,diffraction,transmission,and line-of-sight propagation.Furthermore,path tracking models and signal attenuation models with different spatial propagation mechanisms are established.Secondly,the advantages and disadvantages of the two main deterministic modeling methods in wireless channel propagation research are compared and analyzed,and the forward ray tracing algorithm that is more suitable for channel propagation modeling in complex environments is focused on.Using matlab simulation software,a high-frequency ray tracing simulation platform based on three-dimensional environment modeling was built independently.At the same time,the structure of an enclosed small space scene and the detailed parameters of objects in it were accurately measured,and a propagation environment model was established in the simulation platform.Then,the algorithm is used to simulate the propagation path of the wireless channel under the environment model,and the corresponding propagation path loss,average additional delay and other channel propagation parameters in the simulation are studied and analyzed.Finally,because the forward ray tracing algorithm will have a lot of useless calculations during the simulation calculation,the original algorithm has a problem of too long simulation time.Therefore,this paper adopts the idea of regional division of the overall environment model,and designs the ray tracing acceleration method based on space segmentation.According to the distribution of objects in three-dimensional space,this method reasonably combines two kinds of space segmentation acceleration methods,static and dynamic.Simulation shows that this method can greatly reduce the number of calculations of the intersection point between the ray being tracked and the objects in space in the simulation calculation,and can improve the shortcomings of the algorithm's low calculation efficiency.