Propagation Modeling in an Indoor Environment at Sub-THz Frequencies Based on Ray Tracing

This paper presents extensive deterministic simulations in an indoor environment at sub-THz frequencies. All the relative wideband parameters of the channel are determined and assessed, including the time delay and spatial characteristics. It is demonstrated that simulations with an accurate description of the materials and representation of the propagation environment produce reliable results, given the fact that the parameters, obtained from the simulation study, are found to be consistent with measurement results that exist in the literature for similar indoor locations. The root-mean-square delay spread exhibits values in the range of 0.6-5.4 ns and 1.7-23.0 ns, for line-of-sight (LOS) and non-line-of-sight (NLOS) conditions, respectively. A multi-cluster model characterizes very well the power delay profiles of the indoor channel, which are found to be formed by 3 up to 4, and 5 up to 7 cluster groups for LOS and NLOS conditions, respectively. All the relative clusters and ray's decay patterns, as well as their inter-arrival times are also evaluated.