Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Millimeter Wave and sub-THz Indoor Radio Propagation Channel
  Measurements, Models, and Comparisons in an Office Environment   This letter provides a comparison of indoor radio propagation measurements
and corresponding channel statistics at 28, 73, and 140 GHz, based on extensive
measurements from 2014-2020 in an indoor office environment. Side-by-side
comparisons of propagation characteristics (e.g., large-scale path loss and
multipath time dispersion) across a wide range of frequencies from the low
millimeter wave band of 28 GHz to the sub-THz band of 140 GHz illustrate the
key similarities and differences in indoor wireless channels. The measurements
and models show remarkably similar path loss exponents over frequencies in both
line-of-sight (LOS) and non-LOS (NLOS) scenarios, when using a one meter free
space reference distance, while the multipath time dispersion becomes smaller
at higher frequencies. The 3GPP indoor channel model overestimates the
large-scale path loss and has unrealistic large numbers of clusters and
multipath components per cluster compared to the measured channel statistics in
this letter.

28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga