US 12,273,151 B2
Over-the-air beamforming calibration
Joao Vieira, Hjärup (SE); Johan Nilsson, Höllviken (SE); and Magnus Åström, Lund (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Appl. No. 17/919,590
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Apr. 23, 2020, PCT No. PCT/EP2020/061348
§ 371(c)(1), (2) Date Oct. 18, 2022,
PCT Pub. No. WO2021/213658, PCT Pub. Date Oct. 28, 2021.
Prior Publication US 2023/0155697 A1, May 18, 2023
Int. Cl. H04B 17/12 (2015.01); H04B 7/06 (2006.01); H04B 7/08 (2006.01); H04B 17/14 (2015.01); H04B 17/21 (2015.01)
CPC H04B 17/12 (2015.01) [H04B 7/0617 (2013.01); H04B 7/0691 (2013.01); H04B 7/0874 (2013.01); H04B 17/14 (2015.01); H04B 17/21 (2015.01)] 24 Claims
OG exemplary drawing
 
1. A method of over-the-air beamforming calibration for a multi-antenna transceiver having a first plurality of antenna elements connected to respective transceiver chains, wherein beamforming calibration comprises determining respective beamforming calibration factors for the transceiver chains of the antenna elements of the first plurality, the method comprising:
determining a second plurality of measurement resources for calibration sounding, wherein the second plurality is smaller than the first plurality;
for each measurement resource of the second plurality, selecting one or more antenna elements of the first plurality for sounding signal transmission, wherein each antenna element of the first plurality is selected for one or more of the measurement resources of the second plurality; and
using each measurement resource of the second plurality, overlappingly transmitting respective sounding signals by the selected one or more antenna elements, wherein beamforming calibration comprises determining respective beamforming calibration factors for the transceiver chains of the antenna elements of the first plurality based on sounding signal transmission measurements, and wherein a first transfer function defines a relation between the sounding signal transmission measurements and the beamforming calibration factors.