Study On Propagation Characteristics Of Indoor Millimeter Wave Wireless Channel Based On High Resolution Algorithm

Due to the high bandwidth,high speed and high security of the millimeter wave,and the fact that the high-resolution algorithm can accurately extract the relevant parameters in the channel.The application of high-resolution algorithm for parameter extraction in millimeter-wave channels has become a research hotspot in academia.At present,millimeter-band channel measurement and channel modeling in high-hot and high-capacity environments,such as high-speed rail stations,which are large-scale and have high communication quality requirements,are the key technologies for the study of the fifth-generation mobile communication.Based on the high-resolution algorithm,this thesis has studied the propagation characteristics of millimeter waves in various complex hotspot environments through field measurement and modeling and simulation,and has obtained the multipath propagation characteristics in the indoor line-of-sight and non-line-of-sight environments,which provides a theoretical basis for the research and development of 5G communication.The research methods and relevant results of this thesis are as follows:(1)This thesis first summarizes the research and development status of high-resolution algorithms and millimeter wave channel modeling;This thesis briefly introduces the basic characteristics of millimeter wave,channel modeling methods such as Shooting and Bouncing Ray Tracing/Image method and channel measurement technology;(2)This thesis briefly summarizes the advantages of SAGE algorithm over other high-resolution channel parameter extraction algorithms,and it summarizes the theoretical derivation process of SAGE algorithm and the technical route applied in the measured data processing.This thesis also introduces the subset of parameters?the process of zero initialization?E step and M step that SAGE algorithm needs to perform in computer implementation,and then the SAGE algorithm is used to analyze the parameter extraction performance.The results fully prove the high-resolution characteristics of the SAGE algorithm when extracting channel parameters.(3)In this thesis,the measurement and simulation analysis of the complex application of indoor hotspot environment is carried out.The SAGE algorithm is used to process the SIMO channel measurement data of the line-of-sight environment in Qingdao High-speed Railway Station.Based on the extracted horizontal channel angle and other relevant channel parameters,propagation characteristics of 28 GHz such as direction of arrival and path loss in the line-of-sight environment of the high-speed rail station are studied.Then,the simulation analysis of millimeter wave receiving power and delay spread in the 28 GHz band are carried out for the complex environment of the classroom,and the difference of channel propagation characteristics of scatterers under different materials in the environment are compared.(4)In this thesis,the measurement and simulation analysis of the complex application of indoor non-line-of-sight hotspot environment are carried out.According to the relevant channel parameters of the non-line-of-sight SIMO measurement environment of Qingdao High Speed Railway Station extracted by SAGE algorithm,the non-line-of-sight propagation characteristics of 28 GHz such as multipath propagation mechanism and fading characteristics in the environment of high-speed railway station are studied.Then the simulation analysis of millimeter wave propagation characteristics is carried out for the non-line-of-sight complex environment of the parking lot.And this thesis has discussed the effects of different frequency bands,different antenna polarization modes and different scatterer surface roughness on delay propagation in non-line-of-sight complex environments,which provides a theoretical basis for improving the optimization of channel model parameters in complex high hotspot environments.