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arxiv: 1906.10356 · v1 · pith:YAK5PBXRnew · submitted 2019-06-25 · 📡 eess.SP

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

Mahfuza Khatun , Changyu Guo , Letizia Moro , David Matolak , Hani Mehrpouyan This is my paper

Pith reviewed 2026-05-25 16:58 UTC · model grok-4.3

classification 📡 eess.SP
keywords 73 GHzpath lossmillimeter-waveairport environmentschannel measurementsclose-in modelfloating-intercept modelline-of-sight
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The pith

Measurements at 73 GHz in airport settings yield path loss exponents near free space in the close-in model, while the floating-intercept model fits the data more closely.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reports line-of-sight channel measurements at 73 GHz conducted indoors and outdoors at one airport using directional antennas at varying heights. From the data the authors extract parameters for the close-in reference distance model and the floating-intercept model. The close-in model produces exponents very close to the free-space value of two. The floating-intercept model matches the measured values more accurately overall. These empirical parameters supply concrete inputs for predicting coverage of millimeter-wave links in airport environments.

Core claim

Line-of-sight millimeter-wave propagation measurements at 73 GHz were conducted in indoor and outdoor environments at the Boise Airport with directional transmit and receive antennas of 24 dBi gain at different receive antenna heights. The parameters of the close-in reference distance model and the floating-intercept model were obtained from the measured data, showing that the path loss exponents from the close-in model are very close to free-space while the floating-intercept model fits the data better.

What carries the argument

The close-in reference distance path loss model (CIM) and floating-intercept path loss model (FIM) fitted to directional-antenna measurements at 73 GHz.

If this is right

  • Path loss exponents extracted with the close-in model remain near the free-space value of two in both indoor and outdoor airport settings.
  • The floating-intercept model supplies lower fitting error to the collected data than the close-in model.
  • The derived model parameters apply directly to link-budget calculations for 73 GHz systems in line-of-sight airport conditions.
  • Antenna height and directionality affect the observed path loss values used to fit both models.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

  • The results suggest that open airport spaces allow millimeter-wave signals to propagate with minimal additional loss beyond free space, which could simplify coverage planning for passenger terminals.
  • Repeating the same measurement campaign at other airports would test whether the reported exponents and model preference hold beyond a single site.
  • The preference for the floating-intercept model implies that reference-distance assumptions may need adjustment when antenna heights or surrounding clutter differ from the test setup.

Load-bearing premise

Line-of-sight measurements at a single airport with directional antennas at selected heights represent typical propagation conditions in other airport environments.

What would settle it

Path loss measurements at 73 GHz in a second airport that produce exponents clearly different from two or show the close-in model fitting the data better than the floating-intercept model would falsify the reported result.

Figures

Figures reproduced from arXiv: 1906.10356 by Changyu Guo, David Matolak, Hani Mehrpouyan, Letizia Moro, Mahfuza Khatun.

Figure 1
Figure 1. Figure 1: Block diagram of the (a) Tx and (b) Rx for the mm-Wave propagation [PITH_FULL_IMAGE:figures/full_fig_p002_1.png] view at source ↗
Figure 2
Figure 2. Figure 2: (a) Floor map of the Micron Engineering building. (b) The airport [PITH_FULL_IMAGE:figures/full_fig_p002_2.png] view at source ↗
Figure 3
Figure 3. Figure 3: (a) Photo of the outdoor setting in the airport. (b) Overhead image of [PITH_FULL_IMAGE:figures/full_fig_p003_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: (a) Photo of the outdoor environment at the Boise State campus. (b) [PITH_FULL_IMAGE:figures/full_fig_p003_4.png] view at source ↗
Figure 7
Figure 7. Figure 7: The FIM model at 73 GHz with different Rx antenna heights from [PITH_FULL_IMAGE:figures/full_fig_p004_7.png] view at source ↗
Figure 9
Figure 9. Figure 9: FIM and CIM along with the measurement data taken from the MEC [PITH_FULL_IMAGE:figures/full_fig_p005_9.png] view at source ↗
read the original 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.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript presents results from 73 GHz line-of-sight path loss measurements conducted in indoor and outdoor environments at Boise Airport. Using directional antennas with 24 dBi gain at varying receive heights, the authors collect data and fit parameters for the close-in reference distance model (CIM) and floating-intercept model (FIM). The central claim is that CIM exponents are close to the free-space value while FIM yields a lower fitting error to the measured data.

Significance. If the results hold, the work supplies empirical mmWave path-loss data from an airport setting, a relevant but under-measured environment for 5G/6G system design. The side-by-side application of CIM and FIM to the same LOS dataset provides a concrete, falsifiable comparison of model performance that can be directly tested against future measurements.

minor comments (2)
  1. [Abstract] Abstract: no sample sizes, standard errors on fitted exponents, or data-exclusion criteria are stated, making it difficult to judge the precision of the reported CIM/FIM parameters.
  2. [Results] Results section: the manuscript should report the number of independent measurement locations and total valid data points separately for the indoor and outdoor campaigns so that readers can assess the statistical support for the claim that FIM provides a better fit.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the careful review and for recommending minor revision. The referee's summary correctly captures the scope and central findings of the measurements at Boise Airport. No specific major comments were provided in the report, so we have no individual points to address point-by-point. We will incorporate any minor editorial suggestions that may appear in the full report.

Circularity Check

0 steps flagged

No significant circularity identified

full rationale

The paper reports empirical path loss parameters obtained by direct least-squares fitting of the CIM and FIM models to the collected 73 GHz LOS measurement data at a single airport. The observation that CIM exponents are close to the free-space value (n≈2) is simply the numerical outcome of that fit, not a derivation that reduces to the input by construction. No load-bearing step invokes a self-citation chain, uniqueness theorem, or ansatz smuggled from prior work; the central claims remain descriptive statistics from the measurements themselves.

Axiom & Free-Parameter Ledger

2 free parameters · 1 axioms · 0 invented entities

The paper fits two standard empirical models to new measurement data; the only free parameters are the path loss exponents and intercept values obtained from the airport data.

free parameters (2)
  • CIM path loss exponent
    Fitted directly to the measured received power versus distance data collected at the airport.
  • FIM path loss exponent and intercept
    Both parameters obtained by least-squares fit to the same airport measurement set.
axioms (1)
  • domain assumption Line-of-sight conditions dominate and multipath contributions can be ignored for large-scale fading extraction.
    All campaigns are described as line-of-sight; the models are applied only to these paths.

pith-pipeline@v0.9.0 · 5676 in / 1183 out tokens · 29712 ms · 2026-05-25T16:58:14.604067+00:00 · methodology

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Reference graph

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