Design And Simulation Of Mobile Communication Multi-system Indoor Coverage For Metro

Users are very heterogeneous when using mobile services,although the base stations are built outdoors,but the business is usually in the room.Multi-system indoor coverage principle is signals of multiple operators with different mobile network standard get together with multi-level combiners or a broadband combiner,then through the indoor antenna system distributed to the indoor area,so that users in door can use the mobile communication service anywhere.The rapid development of the subway and the particularity of the subway scene make it important to study the mobile communication coverage in the subway.Based on the multi-system indoor coverage of mobile communication with LTE,this paper analyzes and designs the multi-system coverage scheme of subway scene.Through the minimum coupling loss calculation method,the feasibility of the multi-system integration after adding LTE is verified and the corresponding theoretical isolation requirement is put forward.The multi-system subway coverage scheme satisfying the isolation requirement is designed according to the engineering practice.The MIMO program which cannot be verified by test is verified by simulation,and the design program is verified by test.The main work of this paper is as follows.First of all,the basic knowledge of mobile communication is sorted out.The indoor coverage technology is introduced from two dimensions: signal source and distribution system.In order to facilitate multi-system interference analysis,mainly related to the 2G-GSM system,3G-CDMA system,WCDMA system,4G-LTE system technology and theory.Meanwhile focusing on new technologies in the LTE systems.The distribution system is classified according to the main components of the distribution system,and the new distributed system is also introduced.And then analyze is focused on multi-system isolation,interference isolation analysis is the basis for multiple systems coverage.By combing the principle of interference formation,it is determined that the minimum coupling loss calculation method is used for the interference analysis.Based on the present situation of multi-system indoor coverage,the interference situation after adding LTE system is discussed.Analyze shows the multi-system is still feasible after adding LTE system and gives the corresponding isolation index of each system after adding LTE system.Finally,the design of subway multi-system coverage scheme is carried out on the basis of multi-system indoor coverage.Based on the conclusion of Chapter 3,combined with the key technology of LTE in the second chapter,the paper analyzes design under subway coverage in theory.According to the analysis results,the design of subway multi-system indoor coverage scheme with leakage cable is carried out,and the performance of the design scheme is tested and verified after the project is finished.Because the MIMO technology scheme is not implemented in the project implementation,the performance of the MIMO scheme is verified by the simulation method.