Terahertz communication technology has attracted wide attention from academic circles and industry, and is regarded as the key wireless technology to meet the real-time traffic demand of mobile heterogeneous network system, which can alleviate the capacity bottleneck of the current wireless system and realize ultra-high-speed wireless communication. As a key content of Beam-forming Techniques, indoor channel modeling of terahertz band in NLOS (non-line-of-sight) has become an urgent task. In this paper, according to the position of the receiver and the surrounding scenes, the possible path from the transmitter to the receiver is traced back through geometric optics. The influence of diffraction on the transmission channel of 300GHz indoor communication system is evaluated. Ray tracing technology is combined with knife edge diffraction (KED) and double knife edge (DKE) to simulate the diffraction of wedge-shaped object and human body respectively. The results show that when the wedge-shaped object diffracts, the diffraction coefficient decreases with the increase of the diffraction angle. Diffraction in the wedge area can be ignored in most areas of the room's line of sight, but diffraction power is dominant in the incident boundary and reflection boundary area. Due to the shadow effect caused by human movement, the path attenuation increases significantly. The results provide a research basis for the development of indoor terahertz communication.
Terahertz (THz) communication is a research hotspot in the future communication field. However, limited by the power of the THz source and various particles in the air, indoor THz wireless communication with short distance transmission has practical research value. Due to the strong directivity of THz beam, the line of sight (LOS) path occupies most of the energy of the signal. However, when the LOS path is blocked, the not line of sight (NLOS) path can be used as a supplement to ensure the stability of the communication link. In this paper, a 3D transmission model combining LOS path, primary reflection path and secondary reflection path was established by ray tracing method for indoor laboratory scenes with high demand for communication rate. The carrier frequency range is 220-330GHz. Through the results of power delay profile (PDP) and power angle profile (PAP) at the receiver, the correlation characteristics of important channel parameters such as Rician K-factor, root mean square (RMS) delay spread with different frequency points and different paths are analyzed. The results show that all the channel parameters are strongly correlated with frequency and transmission distance. These theoretical results lay a foundation for the subsequent communication experiments in real experimental condition.
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