Abstract: Due to the sufficient bandwidth and high free space attenuation, future indoor wireless communication systems are expected to work in the terahertz band. In indoor wave propagation channels of such systems, reverberation and diffraction occur at a multitude of objects and hence must be considered for propagation simulations. Although the relevance of diffraction has been thoroughly studied at lower frequency ranges, it has not yet been analyzed methodically in the terahertz wave frequency range. In this paper, the uniform diffraction theory and atmospheric absorption attenuation theory are applied to study the diffraction of typical wedge geometry at 350 GHz. And ray-tracking method is adopted in order to compare the influence of material, roughness and incident angle on the diffraction power. Finally, the double-edge diffraction method is applied to simulate the impact of diffraction on the terahertz wave indoor channel characteristics when humans walk indoor.

Key words: communication, terahertz wave, ray-tracking method, diffraction modeling