Analysis And Optimization Of Co-construction And Sharing Indoor Distribution System

The appeal from Ministry of Industry and Information Technology and the establishment of China Tower Ltd lay the foundation for the co-construction and sharing of new base station.The outdoor base station is realtively saturated,and in the future the large-scale newly built base station must be in the indoor situation.Indoor Distribution System is more sensitive to interference,which directly affects the network coverage quality and KPI index.Therefore the analysis and optimization of intermodulation interference in the Indoor Distribution System of co-construction and sharing is very useful in practice.This paper comprises the generation of Passive Intermodulation(PIM)and the interference localization in the Indoor Distribution System,calculation and optimization of the intermodulation distortion and field test.First,test the passive devices in service,which focus on the intermodulation index,especially 3rd intermodulation distortion average and 5rd intermodulation distortion average.Second,theoretical analysis of intermodulation interference in the Indoor Distribution System of co-construction and sharing is put forward to estimate the intermodulation interference affect on current mobile network systems bands.That is an intermodulation interference location analysis.Third,according to engineering practice,the test of passive devices in service and the analysis of intermodulation interference,simulations of intermodulation distortion are conducted to measure the strength of intermodulation interference.Fourth,a tool to analyze the intermodulation interference is developed by JavaScript.Last a scheme is proposed to solve the problem of passive intermodulation,and the field test is proceeded to prove that the scheme is available.The goal of this dissertation is to provide references for construction and optimization of indoor mobile network,based on both theory and practice.