High-Resolution Spatio-Temporal Evaluation of Specular and Diffuse Paths in THz MIMO Channels

Abstract

This paper presents a spatio-temporal analysis of discrete and diffuse multipath components (or paths) present in a propagation channel at Terahertz (THz) frequencies. These paths were extracted using a high-resolution parameter extraction algorithm RIMAX - an iterative maximum likelihood algorithm. For our analysis, we used measurement data obtained from a THz (300–312 GHz) <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$4\times 4$</tex> Multiple-Input-Multiple-Output (MIMO) measurements conducted in an obstructed Line-of-Sight (OLOS) scenario in a data center environment. We provide statistical model for parameters such as mean direction-of-departure (DOD), mean direction-of-arrival (DOA) and the relevant angular and delay spreads. We provided a closed-form model for the diffuse path propagation along with statistical models for relevant spatial and temporal parameters. We showed that diffuse paths contribute a moderate amount of energy (mean value of 12.7%) to the overall energy measured in the THz MIMO Channel. Results in this work is important to wireless system design and development at THz frequencies.