Study On Interference Of GSM(DCS)/TD/WLAN/LTE Multi Network Combined Road To Indoor Distribution System

This paper mainly studies the interference effect of multi-network multi-load wavefront in indoor distribution system.In recent years,mobile communications has developed rapidly.Major operators have responded to market demand to build a large number of indoor distribution systems.Taking into account the factors of investment and construction cycle and the establishment of the Tower Company,the coverage of indoor mobile signals from 2G to 4G is older than the original indoor distribution system.Multiple carriers are connected directly to multiple networks,which is fast and economical to invest.However,this multi-network multi-carrier junction or even multiple operators 'different standard source junction into a set of indoor distribution system has greatly increased the complexity and instability of mobile signals.After multi-network multi-carrier wavefront,its passive devices are continuously superimposed due to source equipment,and the power tolerance requirements are higher.Interference will also occur within and between systems.The Intermodulation,harmonics and frequency multiplexing signals generated by the junction may interfere with the various systems of the junction,which will seriously affect user perception.In short,the influence of Intermodulation interference after multi-network and multi-carrier waveways is wider,and the ability to suppress the Intermodulation of passive devices is more demanding.In the first part of this paper,we first analyze the possible interference effects of multi-network multi-carrier,and analyze the possibility of interference through theoretical research.In the second part,through the opportunity to cooperate with Teller's laboratory in the work,a large number of experimental multi-network multi-carrier interference presentations are performed in the indoor distribution system that actually operates on the network.In the last part of the study,the multi-network multi-carrier interference meets the standard,that is,the user's perception of the use of any problem to study the requirements for the technical parameters of various types of devices in the indoor distribution system.In addition,the main passive devices produced by various manufacturers in the network are tested,and the technical standards of the industry are combined to provide reference for the company's future procurement products.