Blind Calibration of Phase Drift in Millimeter-Wave Channel Sounders
Millimeter-wave channel sounders are much more sensitive to phase drift than their microwave counterparts by virtue of shorter wavelength. This matters when coherently combining untethered channel measurements ? scanned over multiple antennas either electronically or mechanically in seconds, minutes, or even hours ? to obtain directional information. To eliminate phase drift, a synchronization cable between the transmitter and receiver is required, limiting deployment range and flexibility indoors, and precluding most outdoor and mobile scenarios. Instead, we propose a blind technique to calibrate for phase drift by post-processing the channel measurements; the technique is referred to as blind because it requires no reference signal and, as such, works even in non-line-of-sight conditions when the (reference) direct path goes undetected. To substantiate the technique, it was tested on real measurements collected with our 60-GHz virtual phased-array channel sounder, as well as through simulation. The technique was demonstrated robust enough to deal with the most severe case of phase drift (uniformly distributed phase) and in non-line-of-sight conditions.
Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| bureauCode |
[
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| contactPoint |
{
"fn": "Camillo Gentile",
"hasEmail": "mailto:camillo.gentile@nist.gov"
}
|
| description | Millimeter-wave channel sounders are much more sensitive to phase drift than their microwave counterparts by virtue of shorter wavelength. This matters when coherently combining untethered channel measurements ? scanned over multiple antennas either electronically or mechanically in seconds, minutes, or even hours ? to obtain directional information. To eliminate phase drift, a synchronization cable between the transmitter and receiver is required, limiting deployment range and flexibility indoors, and precluding most outdoor and mobile scenarios. Instead, we propose a blind technique to calibrate for phase drift by post-processing the channel measurements; the technique is referred to as blind because it requires no reference signal and, as such, works even in non-line-of-sight conditions when the (reference) direct path goes undetected. To substantiate the technique, it was tested on real measurements collected with our 60-GHz virtual phased-array channel sounder, as well as through simulation. The technique was demonstrated robust enough to deal with the most severe case of phase drift (uniformly distributed phase) and in non-line-of-sight conditions. |
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|
| identifier | ark:/88434/mds2-2326 |
| issued | 2021-01-05 |
| keyword |
[
"5G",
"beamforming",
"clock drift",
"mmWave",
"phase coherence",
"phased-array antennas"
]
|
| landingPage | https://data.nist.gov/od/id/mds2-2326 |
| language |
[
"en"
]
|
| license | https://www.nist.gov/open/license |
| modified | 2020-06-11 00:00:00 |
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|
| publisher |
{
"name": "National Institute of Standards and Technology",
"@type": "org:Organization"
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|
| references |
[
"https://doi.org/10.1109/ACCESS.2020.3001852"
]
|
| theme |
[
"Advanced Communications:Wireless (RF)"
]
|
| title | Blind Calibration of Phase Drift in Millimeter-Wave Channel Sounders |
