Research On Blind Spot Analysis And Transmission Model Of ENB Cell

In recent years,with the rapid development of 4G,the corresponding number of 4G users are growing rapidly.In order to meet so many user needs,4G base station eNB construction needs will follow.With the rapid development of the city,the number and height of buildings are gradually increasing.When the building has been blocked to the spread of wireless signals,this time the blind spot produced.And to determine whether the height of the building on the impact of signal transmission,it is necessary to carry out the corresponding blind spot analysis.When there is a blind spot in the cell,network optimization personnel should carry out the corresponding wireless network optimization.The early network optimization personnel is to collect the information data by means of field trips of scene information.In this thesis,blind analysis based on image segmentation is expected to provide theoretical support for the automatic data collection and processing.When the collected data judge that the height of the building has been affected the spread of wireless signals,it can inform our network optimization personnel to optimize the wireless network or build a new base station.If we want to make the wireless network optimization,we must carry out the related research in the propagation model under a specific coverage scenario,and then estimate the link budget,estimate the coverage area,so as to achieve the best network optimization.This thesis is based on FDD-LTE,the influence of building height on path loss is discussed based on the cell.First of all,through the image segmentation technology for blind spot analysis,through the image segmentation technology can be the outline of the building,and then through the gray histogram to compare the height of the building has changed.Then,the related concepts of microcell and radio wave propagation theory are introduced.The relationship between building height and diffraction loss is obtained by Fresnel clearance theory.Then the WIM model is introduced and simulated in detail,and the WIM model is simplified.Finally,the related propagation model of the macrocell is introduced,and then the two Hata models are simulated in different coverage scenarios and the conclusion is drawn.Then,based on FDD-LTE,the uplink budget analysis is discussed and the coverage area is estimated by COST231-Hata model.It is hoped that this thesis will provide theoretical guidance and suggestions on the optimization of wireless network and the construction of base stations.