| At present,with growing mobile users and increasing demand of communication,spectrum resources are gradually tense.In order to expand spectrum resources,millimeter wave band has been designated as commercial band in the standardization work of the 5G(The 5th Generation).However,millimeter wave is easy to be disturbed by propagation environment,which will cause great path loss in the process of propagation.Large-scale antenna gain is usually used to combat the path loss in millimeter wave communication.In order to make the large-scale antenna system more flexible in the actual network,the large-scale antenna design based on panel is adopted in 5G standard.Therefore,the research on multi-panel MIMO(Multiple Input Multiple Output)transmission technology in millimeter wave communication is of great significance to overcome the high path loss and improve the system capacity.The topic of this paper comes from "Evaluation and Validation of 5G International Standard Candidate Schemes" in the major project of national science and technology.And this paper designs and implements a system level simulation platform for multi-panel MIMO transmission technology in millimeter wave communication.On this platform,the multi-panel MIMO transmission technology in millimeter wave communication is further studied,and the simulation verification and performance analysis are carried out,which provides theoretical reference for standardization work.The main work of this paper is as follow:Firstly,millimeter wave communication and large-scale MIMO technology are reviewed.This paper summarizes the current situation of millimeter wave communication,studies the key technology of large-scale MIMO,and analyzes its principle,which lays the foundation for the research of multi-panel MIMO.Furthermore,the multi-panel MIMO transmission technology in millimeter wave communication is reviewed to analyze the current problems and challenges.And,the research status of communication system level simulation platform is summarized,which provides a basis for the design and implementation of multi-panel MIMO system level simulation platform in millimeter wave communication.Secondly,the paper finishes the development of the multi-panel MIMO system level simulation platform in millimeter wave communication.The paper analyzes the requirements and designs generally,and according to the functional requirements,the channel module,scheduling module and feedback module of the platform are mainly designed.Ditected by the overall design,the development and implementation of the system level simulation platform are completed,and the basic functions of the platform are tested and evaluated.The test results show that the platform can complete the communication simulation of multi-panel MIMO in millimeter wave communication on the basis of downward compatibility with the original platform.Finally,aiming at the problem of poor performance of edge users and the whole system in millimeter wave communication,this paper studies the transmission scheme of multi-panel MIMO system,and proposes two transmission schemes,namely,single-beam transmission scheme based on proportional fairness and multi-beam transmission scheme based on beam grouping.These two transmission schemes design beam scheduling algorithm and feedback scheme to solve the problem of poor edge user performance and system performance in millimeter wave communication.The two schemes are evaluated on the system level simulation platform,and the simulation results show that the single-beam transmission scheme based on proportional fairness can greatly improve the spectral efficiency of edge users with less impact on the system performance,and the multi-beam transmission scheme based on beam grouping can effectively improve the average spectrum efficiency of the system. |
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