Ray Tracing Meets Terahertz: Challenges and Opportunities
Haofan Yi, Danping He, P. Takis Mathiopoulos, Bo Ai, Juan Moreno, Jianwu Dou, Zhangdui Zhong
Abstract
It is very likely that the terahertz (THz) spectrum will be used for the operation of the upcoming 6th generation wireless communication systems. This article presents a study for the application of ray tracing (RT) for THz channel modeling. Because of the extremely short wave-lengths of THz signals, we argue that signal propagation in the THz spectrum can be precisely modeled by employing RT techniques, and thus accurate channel models can be obtained in an efficient manner. We first review recent research and standardization activities related to RT-assisted channel modeling that mainly deal with millimeter-wave applications and, to a much lesser extent, have been applied the THz spectrum. Then we present the basic THz wave propagation characteristics, including reflection, scattering, penetration, and shadowing as well as signal absorption by atmospheric molecules and tiny particles under different weather conditions. The methodologies for the appropriate construction of target scenarios are presented as well as efficient computational methods for the effective RT operation. Finally, various research and development challenges related to RT-based channels for future THz communication systems are identified, and possible solutions are highlighted.