Research On Non-cooperative Positioning Technology Based On LTE

In recent years,with the rapid popularization of navigation services and the rapid development of wireless communication industry,the terminal positioning technology based on wireless communication network gradually becoming the research hotspot.Mainly in integration with all kinds of wireless network such as WIFI,Broadcasting Network,ZigBee and cellular mobile communication network which makes wireless positioning technology can achieve interdisciplinary applications.The existing terminal positioning scheme based on cellular network can be roughly divided into positioning scheme based on the network side and positioning scheme based on the terminal side.The non-cooperative positioning technology is based on the network side,it neither need the cooperation of users nor modify the mobile station of users.This characteristic guaranteeing and expanding the existing positioning applications which attracts great attentions.This paper introduces the non-cooperative positioning technology on the basis of standard LTE network.According to the characteristics of physical reference signal in LTE uplink,it studies in depth by following the aspects of paraneter estimation and positioning solution which provides a reference for the development of wireless location and subsequent release of LTE.The main contents of this paper are:First,by analyzing the LTE standard positioning scheme and process,the paper puts forward a scheme suitable for non-cooperative positioning based on LTE.The main structure and working mechanism of positioning system is studied by combining with LTE system characteristics including OFDM,MIMO,network topology,etc.At the same time,the selection of reference signal for positioning standards and parameters configuration is studied to improve the overall positioning scheme,What's more,the theory feasibility of non-cooperative positioning technology based on the LTE network is verified.Then,on the basis of the conventional parameter estimation algorithms,this paper.introduces a kind of time-frequency domain transformation named FRFT including its definition,discrete signal and related application.By combining with mature AOA algorithm MUSIC,it finally puts forward a suitable method for non-cooperative positioning based on LTE and accomplishes the related simulation.Thirdly,from the positioning solution,the paper analyzes the crucial influence factors including GDOP and NLoS in traditional positioning system.Then it introduces the traditional methods and points out their problems in the non-cooperative positioning technology.Last,it puts forward a new positioning calculating method to solve these problems and completes the related simulation.Fourthly,from the view of engineering,this paper discusses construction scheme of positioning simulation platform with the R&S CMW500,USRP of Ettus and related SW&HW.According to the LTE system structure,the non-cooperative positioning experiment platform based on LTE network is established,and the performance of the experimental platform is evaluated.Last,Summary of the whole paper and respective are presented.