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Terahertz (THz) communication is now being considered as one of possibletechnologies for the sixth generation (6G) communication systems. In thispaper, a novel three-dimensional (3D) space-time-frequency non-stationarymassive multiple-input multiple-output (MIMO) channel model for 6G THz indoorcommunication systems is proposed. In this geometry-based stochastic model(GBSM), the initialization and evolution of parameters in time, space, andfrequency domains are developed to generate the complete channel transferfunction (CTF). Based on the proposed model, the correlation functionsincluding time auto-correlation function (ACF), spatial crosscorrelationfunction (CCF), and frequency correlation function (FCF) are investigated. Theresults show that the statistical properties of the simulation model match wellwith those of the theoretical model. The stationary intervals at differentfrequencies are simulated. The non-stationarity in time, space, and frequencydomains is verified by theoretical derivations and simulations.

A Novel 3D Space-Time-Frequency Non-Stationary Channel Model for 6G THz Indoor Communication Systems