# Millimeter-Wave Path Loss at 73 GHz in Indoor and Outdoor Airport Environments

## TL;DR

This study presents and compares two large-scale path loss models at 73 GHz based on indoor and outdoor measurements at an airport, highlighting their accuracy and applicability in such environments.

## Contribution

The paper provides the first measurement-based large-scale path loss models at 73 GHz in airport environments, using both CIM and FIM models for indoor and outdoor settings.

## Key findings

- FIM offers a better fit to measurement data than CIM.
- Path loss exponents are close to free-space values.
- Indoor and outdoor models are derived from real measurements.

## Abstract

In this paper, two large-scale fading path loss models are presented based on indoor and outdoor channel measurements at 73 GHz. The line-of-sight millimeter-wave propagation measurement campaigns were uniquely conducted within the indoor and outdoor environments at an airport setting, i.e., the Boise Airport. The channel measurements were made with directional transmit and receive antennas with a 24 dBi gain at different receive antenna heights. From the measured data, we obtained the parameters of two path loss models, i.e., the close-in reference distance model (CIM) and the floating-intercept model (FIM). Results show that the path loss exponents estimated from the CIM are very close to that of the free-space path loss model, while the FIM provides a better fit to the measurement data.