Research On Terahertz MIMO Channel Measurement And Modeling

With the commercialization of global fifth-generation mobile communication networks,new application scenarios such as big data,cloud computing,smart cities and air-space integration are coming.To meet the demand for high data rates and low latency for future services,research on sixth generation networks has been initiated,and Terahertz communication is considered to be the key technology for 6G wireless systems.The wireless propagation channel is the transmission medium for transmitting information between the transmitter and receiver,and the channel characteristics determine the ultimate performance limit of the wireless communication system;therefore,conducting terahertz channel research is a prerequisite for designing 6G mobile communication systems.In this thesis,two aspects of terahertz channel measurement and channel modeling are investigated.First,the principles of three major THz channel measurement methods are introduced.Then,a VNA-based channel measurement system is applied to measure the THz channel in the 220-325 GHz band,and virtual antenna array method is used to complete the 16 X 16 THz MIMO channel measurements.Based on the measurement results,effects of common obstacles including the glass,wooden board and human body on the static THz MIMO channel are investigated.Finally,a geometry-based stochastic channel model is developed for the typical dynamic scenario in THz band.Based on the channel transfer function derived from the model,spatial-temporal correlation function and Doppler power spectrum are obtained to analyze the non-stationary of the THz channel.