Abstract—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.
Index Terms—mmWave, THz, channel models, multipath time
dispersion, 5G, 6G, large-scale path loss, 3GPP InH.
more »
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A Wideband Sliding Correlation Channel Sounder in 65 nm CMOS: Evaluation Board Performance
Abstract—Emerging applications such as wireless sensing,
position location, robotics, and many more are driven by the
ultra-wide bandwidths available at millimeter-wave (mmWave)
and Terahertz (THz) frequencies. The characterization and effi-
cient utilization of wireless channels at these extremely high
frequencies require detailed knowledge of the radio propaga-
tion characteristics of the channels. Such knowledge is developed
through empirical observations of operating conditions using
wireless transceivers that measure the impulse response through
channel sounding. Today, cutting-edge channel sounders rely
on several bulky RF hardware components with complicated
interconnections, large parasitics, and sub-GHz RF bandwidth.
This brief presents a compact sliding correlation-based chan-
nel sounder baseband built on a monolithic integrated circuit
(IC) using 65 nm CMOS, implemented as an evaluation board
achieving a 2 GHz RF bandwidth. The IC is the world’s first
gigabit-per-second channel sounder baseband implemented in
low-cost CMOS. The presented single-board system can be
employed at both the transmit and receive baseband to study
multipath characteristics and path loss. Thus, the single-board
implementation provides an inexpensive and compact solution for
sliding correlation-based channel sounding with 1 ns multipath
delay resolution.
Index Terms—142 GHz, channel sounder, mmWave, on-chip
baseband, PN sequence, RF hardware, sliding correlation, THz,
XPD
more »
« less
- Award ID(s):
- 1909206
- NSF-PAR ID:
- 10309427
- Date Published:
- Journal Name:
- IEEE transactions on circuits and systems
- Volume:
- 68
- Issue:
- 9
- ISSN:
- 1057-7130
- Format(s):
- Medium: X
- Sponsoring Org:
- National Science Foundation
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Accepted Manuscript1.0
- Journal Article:
- The DOI is not currently available.
