Study On Modeling Of 28GHz Millimeter Wave Propagation In Indoor Hotspot Large Capacity Environment

In the wave of research and development of 5G candidate technologies,the global mobile communication industry has gradually reached a consensus on the 5G application scenario.Enhanced mobile broadband is one of the three major applications for the future 5G defined by the ITU.The hotspot large capacity environment is China's IMT-2020(5G)propulsion group based on the needs of the network to further subdivide the scene,including the high-speed rail waiting hall,gymnasium,shopping malls and so on.In this environment,the mobile communication base station and the wireless receiving end access point interfere with each other,resulting in a sharp drop in the space multiplexing capability and throughput.Therefore,it is urgent to study the bandwidth-rich millimeter wave band.The 28 GHz millimeter wave is suitable for hotspot large capacity environment in the future 5G communication frequency band proposed by the FCC.However,the industry's research on channel measurement and modeling is relatively scarce.This thesis studies the characteristics of 28 GHz millimeter-wave band simulation and measured channel in hotspot large capacity environment which can provide theoretical reference support for accurate next-generation wireless communication channel model.The main research contents and contributions are as follows:(1)Firstly,the research status,basic characteristics and channel propagation parameters of millimeter wave are introduced.(2)Then the Shooting and Bouncing Ray Tracing/Image method and the measurement system are introduced.Four implementation processes of SAGE algorithm,including the sub-parameter set,set the initial value,E steps,M steps,etc.,and its computer implementation process are mainly elaborated.(3)The correctness in large-scale shopping mall environment has been verified: SBR / Image method is used in large shopping mall environment.The simulation data shows good agreement with the measured data in the known thesis.(4)The measurement in high-speed rail waiting hall: In this thesis,a 28 GHz millimeter-wave channel measurement and propagation characteristics analysis was carried out in a high-speed rail waiting hall in Qingdao,and the 28 GHz band channel model was parameterized in a high-capacity indoor hotspot large capacity environment.(5)Simulation analysis in large-scale gymnasium: The simulation of millimeter-wave propagation in 28 GHz band is carried out in large-scale gymnasium.The differences of received power and RMS delay parameters are compared under the conditions of line-of-sight and non-lineof-sight respectively when the depth,frequency band and material are different.(6)Simulation analysis in university canteen: The propagation characteristics of millimeter wave in the 28 GHz frequency band in a canteen environment are simulated and analyzed.The influences of different vertical polarization,horizontal polarization and roughness on channel analysis of simulation environment are discussed.