Research On Large Scale MIMO Rapid Prototyping Verification System Based On Universal Server

Since the beginning of the 21 st century,the Internet industry and the mobile communication technology have been rapidly developing.In order to meet the explosion of terminal equipments and communication traffic in mobile Internet and the Internet of Things era,people have set off a research boom on the fifth generation mobile communication system(5G).As one of the core technologies of 5G,massive multiple-input multiple-output(MIMO)can greatly improve the spectral efficiency and energy efficiency of the system.However,throughout the history and present situation of large-scale MIMO technology,the majority is theoretical research and the publicly reported verification platform can not meet the actual requirements for the verification of algorithm development and performance testing for large-scale MIMO systems.There are many disadvantages,such as large development difficulty,long deployment cycle,low bandwidth,poor scalability,and so on.This paper faces the bottleneck problem and aims at the research of a large-scale MIMO rapid verification platform based on Universal Server Architecture,which gives full play to the advantages of mass data processing,high complexity computing,fast programming and flexible configuration of the universal server.On the basis of an efficient and stable FPGA software radio module,a prototype verification system of large-scale MIMO theory and algorithm to meet various parameters can be constructed rapidly.The specific work arrangements are as follows:Firstly,the physical layer for large scale MIMO rapid prototyping verification system is designed after completing the research on the current situation of large-scale MIMO research.Based on the design of the index of the prototype verification system and the structure of the wireless frame,the parameters of the system are determined and the MIMO uplink and downlink chain transmission link is designed.It focuses on frame synchronization technology,including frame synchronization based on CP,rough synchronization and fine synchronization based on PSS.After that,the channel estimation and channel equalization technology implemented on the system are studied.Secondly,in this paper,the software radio module of a large-scale MIMO rapid prototype verification system is designed and implemented.On the basis of the hardware architecture of the system,this paper introduces the design and implementation of the software radio module in detail and the key technologies introduced are air interface synchronization hardware implementation,Gigabit LAN data collection and transmission,realization of USRP RIO hardware language on base station and user end.And then the baseband data transmission part of the 4x16 MIMO on the downlink is deployed.Nextly,this paper introduces the software design and implementation of the server side.After introducing the development environment of the server side,the main development technology of the server side is enumerated and the core of the server side is described in detail: the server side multithread software architecture.A detailed introduction is made to the main control thread,the uplink MIMO processing thread,and the downlink precoded thread.By flexibly modifying the implementation of the algorithm,it can quickly verify the performance of various MIMO algorithms and meet the needs of different verification platforms.At last,this paper mainly introduces the demonstration and measurement of large scale MIMO rapid prototype verification system,including four eight transmission of the uplink and downlink of the system,and the measurement of the channel environment in three scenarios,including indoor scenes,hall scenes and outdoor to indoor scenes.The key is the analysis of channel estimation and channel impulse response in different scenes.