Research On LTE Indoor Location Based On Region Division

With the rapid development of the Internet and mobile communications,people's demand for location-based services has grown rapidly.Wireless indoor positioning will have a very broad application prospect as the basis for indoor location services.At the same time,with the advancement of Long Term Evolution(LTE)technology commercialization,LTE positioning has become the mainstream indoor positioning technology.For the indoor positioning environment,due to the prevalence of building structures,LTE signals must pass through the wall during the propagation process,resulting in LTE positioning signals with NLOS measurement errors.In this paper,the wireless positioning method is combined with LTE technology,and the known building structural elements are used as prior information to accurately estimate the non-line-of-sight error of the positioning signal.Then the error is eliminated to improve the positioning accuracy.In order to use the prior information of the building structure,the building structure is first modeled to obtain the topology of the building structure so that all the walls in the positioning area can be learned by the algorithm.Then analyzes the principle of wall influence on LTE signal,and gives a quantitative expression of the error caused by the wall.Then,using the characteristics of building structure topology and wall errors,an indoor algorithm based on area division is proposed.Then,the division method based on wall intersection point is proved theoretically,and an algorithm using the random point method to realize the automatic construction of the sub-regions obtained by partitioning is proposed.According to the LTE signal propagation characteristics and energy loss model to determine the information of each sub-region,the sub-region of the positioning area is divided to determine the wall combination of the points to be measured in each area and establish the ranging error and energy loss data set.Using the energy loss to determine the sub-area where the point to be measured is located,the error of the LTE positioning signal can be accurately estimated.The corrected measurement values are brought into the positioning algorithm to improve the positioning accuracy.Finally,using the simulation platform MATLAB to verify the proposed algorithm based on the regional division of the indoor positioning algorithm,first of all,the sub-region division and the establishment of data sets for simulation to reproduce,verifying the feasibility and practicality of the algorithm.Then the performance comparison with the traditional positioning method shows that the method has greater performance than the traditional method.