Blind Calibration of Phase Drift in Millimeter-Wave Channel Sounders

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.

Resources

Name Format Description Link
0 https://doi.org/10.18434/mds2-2326
47 https://data.nist.gov/od/ds/mds2-2326/Fig5a.mat.sha256
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47 https://data.nist.gov/od/ds/mds2-2326/Fig4b.mat.sha256
5 Fig5a.mat https://data.nist.gov/od/ds/mds2-2326/Fig5a.mat
33 BlindCalibration.pdf https://data.nist.gov/od/ds/mds2-2326/BlindCalibration.pdf
47 https://data.nist.gov/od/ds/mds2-2326/BlindCalibration.pdf.sha256
5 Fig1.mat https://data.nist.gov/od/ds/mds2-2326/Fig1.mat
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5 Fig4a.mat https://data.nist.gov/od/ds/mds2-2326/Fig4a.mat
47 https://data.nist.gov/od/ds/mds2-2326/Fig4a.mat.sha256

Tags

  • 5g
  • clock-drift
  • mmwave
  • phased-array-antennas
  • beamforming
  • phase-coherence

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