Design And Implementation Of Interference Modeling And Capacity Analysis In LTE-FDD System

One of the most important challenges of LTE is the same frequency interference problem.With the increase in the number of stations,station spacing more and more dense,the interference between the district is also increasing,thereby reducing the cell rate,but inhibit the increase in the overall network capacity.With the popularity of mobile 4G networks,increasing network users,new business continues to emerge,operators need to continue to increase the site to meet the growing demand for wireless data transmission.Based on the resource allocation of LTE-FDD system,this paper analyzes the interference and capacity of LTE system,simulates the user distribution and combines the theoretical modeling to calculate the network capacity under different scenarios,and provides a reference for LTE network planning.Therefore,the interference and capacity of the LTE system are analyzed,and the interference with the frequent networking system and the calculation of the cell capacity are of practical significance to the LTE network planning.This paper introduces the knowledge of LTE network,describes the basic technology of LTE-OFDM technology and MIMOI technology,and explains the necessary explanation of LTE-FDD frame structure and downlink physical resource allocation.The relationship between interference and how to analyze the relationship between interference and user distance is explained.The concept of capacity is expounded.The capacity of LTE network is mainly affected by spectrum resources,network structure,cell load,channel overhead,MIMO technology and Business model and other factors.The method of modeling the interference and noise power under the single neighborhood is analyzed,and the SINR calculation formula under the single neighborhood scene is deduced.The interference superposition method in the multi-neighbor scene is analyzed,Signal and interference plus noise ratio calculation formula,thus to study the distance between the user and the site and the user received a useful signal and interference signal strength relationship.According to the mapping method of the cell capacity and the mapping method of SINR and spectral efficiency,the cell capacity under single-user scene and multi-user scenario is modeled.Simulation of the model is carried out by Matlab simulation software,that is,The relationship between the number of sites and the capacity of the community is studied,and the trend of the useful signal strength of the user with the increase of the site capacity is obtained,and the optimal number of the stations is guaranteed to ensure the user's load,As a powerful basis for the analysis of the number of site layout,and become an important reference for late network planning.