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Channel Characterization for Vehicle-to-Infrastructure Communications at the Terahertz Band

Although the vehicular communications began from the era of the Long Term Evolution (LTE), the strict requirements of the vehicular safety and advanced applications force the academic and industrial communities to continue the topic on the next-generation vehicular communications. In order to realize extremely high reliability and low latency, the frequency spectrum of terahertz (THz) band with ultra-large bandwidth is likely to be one of the candidates at the age of beyond 5th-generation communications (B5G). In this paper, a measurement-validated self-developed ray-tracing (RT) simulator of Beijing Jiaotong University is utilized to characterize the vehicle-to-infrastructure (V2I) channel at 300-308 GHz in highway scenario. Corresponding channel parameters, in line with the standard channel models, are then fed into the quasi deterministic radio channel generator (QuaDRiGa), which is a 3GPP 38.901 reference implementation. The differences in path loss and root-mean-square (RMS) delay spread between RT and QuaDRiGa are summarized, respectively. The good agreement in the power domain and the time domain indicates that the channel parameters provided in our work can operate well in the standard channel model. These results can be used to guide the design of the future vehicular communications at the THz band.