Path Loss, Angular Spread and Channel Sparsity Modeling for Indoor and Outdoor Environments at the sub-THz Band

TL;DR

This paper presents comprehensive measurement-based models for path loss, angular spread, and channel sparsity at 141-145 GHz in indoor and outdoor environments, aiding future sub-THz wireless system design.

Contribution

It introduces new measurement results and models for large-scale path loss, angular spread, and channel sparsity at sub-THz frequencies for diverse propagation scenarios.

Findings

Developed omni-directional and directional path loss models for sub-THz band.

Analyzed power angular spread using the 2nd and 3rd strongest MPCs.

Assessed channel sparsity using the Gini index.

Abstract

In this paper, we present new measurement results to model large-scale path loss, angular spread and channel sparsity at the sub-THz (141-145 GHz) band, for both indoor and outdoor scenarios. Extensive measurement campaigns have been carried out, taking into account both line-of-sight (LoS) and non line-of-sight (NLoS) propagation. For all considered propagation scenarios, omni-directional and directional path loss models have been developed, based on the so-called close-in (CI) free-space reference distance model. Moreover, path loss modeling has been applied for the 2nd and 3rd strongest multipath components (MPCs), based on which path loss exponent and large-scale shadow fading estimates have been derived. A power angular spread analysis is further presented, using up to the 3rd strongest MPC. Finally, results on the sparsity of the wireless channel have also been presented by employing the so-called Gini index.