Design Of Indoor Wireless Multi-Network Distribution System For A Complex Building

At present,China's mobile communications has a good momentum of development.In the first 11 months of 2017,China's total telecommunications business grew by 69% year-on-year,and telecom business revenue increased by 6.5% year-on-year,which is a medium-to-high-speed growth compared with the 1.2% growth rate of the global basic telecommunications industry.With the development of the mobile communication industry,the amount of traffic generated by users using mobile phones in large buildings(especially commercial complexes,public places,etc.)is also increasing.According to the latest statistics of operators,the traffic volume and communication traffic absorbed by office buildings,transportation hubs,hotels,etc.account for about 70%.However,such sites are often blind spots for network coverage due to the structure of the building itself.Therefore,solving the coverage of indoor mobile services is of great significance to meet the needs of users and improve the quality of network communication.This thesis first introduces the characteristics of POI equipment and the characteristics of MIMO technology that are mainly used in the multi-network standard shared room subsystem.The POI equipment is divided into common type and transparent transmission type according to the characteristics of the equipment.The scheme design application is divided into the transmission and reception and the transmission and reception,and the MIMO technology not only solves the problem of isolation between multiple network standards,but also improves the communication capacity and speed.Secondly,this paper analyzes the requirements of the communication operators for the indoor distribution system technical parameters,combs the intermodulation interference generation points and circumvents them according to the characteristics of the carrier network standard frequency,and clarifies the passive device capacity selection criteria through the device characteristics.Finally,the article classifies different scenarios for the structural characteristics of the covered target buildings,and selects different antenna models.In order to ensure the effective design results,this paper adopts the method of analog measurement to verify the coverage effect.At the same time,through the calculation,the application of MIMO technology is improved,and the system capacity can be improved as much as possible without increasing the investment of a large amount of system.The verification scheme designed in this thesis successfully carries local mobile,telecommunication,and Unicom,including GSM900,CDMA,WCDMA,TDD-LTE,FDD-LTE and other network standards.At the same time,it adopts "cross-layer MIMO" technology to build a shared room for later batch construction.The system lays the foundation.