Low complexity angle of arrival (AOA) array calibration

Patent metadata

Field	Value
Publication number	US-12199685-B2
Application number	US-202217657645-A
Country	US
Kind code	B2
Filing date	Apr 1, 2022
Priority date	Oct 4, 2019
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A Multiple-Input Multiple-Output (MIMO) device comprises an array of multiple antennas and a circuitry configured to receive, using the array of multiple antennas, a plurality of calibration signals from a plurality of proximate wireless MIMO devices, calibrate the wireless MIMO device based on the received calibration signals and based on known directions from the wireless MIMO device to each of the proximate wireless MIMO devices, and drive the array of multiple antennas to emit a beam-formed calibration signal to each of the proximate wireless devices in order to enable each of the proximate wireless MIMO devices to calibrate itself.

First claim

What is claimed is:

1. A wireless multiple-input and multiple-output (MIMO) device, comprising:
an array of antennas; and
circuitry, configured to:
receive, using the array of antennas, a plurality of calibration signals from a plurality of proximate wireless MIMO devices;
calibrate the wireless MIMO device based on the received plurality of calibration signals and based on known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices; and
drive the array of antennas to emit a beam-formed calibration signal to each proximate wireless MIMO device of the plurality of proximate wireless devices, in order to enable each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices to calibrate itself.

2. The wireless MIMO device of claim 1 , wherein the wireless MIMO device is operable as an access point (AP) of a wireless network.

3. The wireless MIMO device of claim 2 , wherein the wireless network is a Wi-Fi network.

4. The wireless MIMO device of claim 1 , wherein calibrating the wireless MIMO device comprises:
estimating at least one of a phase mismatch or an amplitude mismatch for each antenna of one or more antennas of the array of antennas based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless devices, and
adjusting transmission coefficients according to the at least one of the phase mismatch or the amplitude mismatch.

5. The wireless MIMO device of claim 1 , wherein each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices transmits a respective calibration signal of the plurality of calibration signals in omnidirectional transmission mode.

6. The wireless MIMO device of claim 1 , wherein the circuitry is configured to calibrate the wireless MIMO device according to an aggregation of calibration signals of the plurality of calibration signals received from at least some proximate wireless MIMO devices of the plurality of proximate wireless MIMO devices.

7. The wireless MIMO device of claim 1 , wherein the circuitry is configured to perform two or more calibration iterations, each calibration iteration comprising:
receiving, using the array of antennas, the plurality of calibration signals from the plurality of proximate wireless MIMO devices,
calibrating the wireless MIMO device based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices, and
driving the array of antennas to emit a beam-formed calibration signal to each proximate wireless MIMO device of the plurality of proximate wireless devices, in order to enable each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices to calibrate itself.

8. The wireless MIMO device of claim 1 , wherein at least one proximate wireless MIMO device of the plurality of proximate wireless MIMO devices is further configured to calibrate itself using beam-formed calibration signals received from at least one additional wireless MIMO device of the plurality of proximate wireless MIMO devices after the at least one additional wireless MIMO device is calibrated.

9. A method, comprising:
receiving, using an array of antennas of a wireless multiple-input and multiple-output (MIMO) device, a plurality of calibration signals from a plurality of proximate wireless MIMO devices,
calibrating the wireless MIMO device based on the received plurality of calibration signals and based on known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices, and
driving the array of antennas to emit a beam-formed calibration signal to each proximate wireless MIMO device of the plurality of proximate wireless devices, in order to enable each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices to calibrate itself.

10. The method of claim 9 , wherein calibrating the wireless MIMO device comprises:
estimating at least one of a phase mismatch or an amplitude mismatch for each antenna of one or more antennas of the antenna array based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless devices, and
adjusting transmission coefficients according to the at least one of the phase mismatch or the amplitude mismatch.

11. The method of claim 9 , wherein two or more calibration iterations are performed, each calibration iteration comprising:
receiving, using the array of antennas, the plurality of calibration signals from the plurality of proximate wireless MIMO devices and calibrating the wireless MIMO device based on the received plurality of calibration signals and based on known directions from the wireless MIMO device to each proximate wireless MIMO device of the proximate wireless MIMO devices, and
driving the array of antennas to emit a beam-formed calibration signal to each proximate wireless MIMO device of the plurality of proximate wireless devices in order to enable each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices to calibrate itself.

12. The method of claim 9 , wherein the wireless MIMO device is operable as an access point of a wireless network.

13. The method claim 12 , wherein the wireless network is a Wi-Fi network.

14. The method of claim 9 , wherein calibrating the wireless MIMO device comprises:
estimating a phase mismatch for each antenna of one or more antennas of the antenna array based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless devices, and
adjusting transmission coefficients according to the phase mismatch of each antenna.

15. The method of claim 9 , wherein calibrating the wireless MIMO device comprises:
estimating an amplitude mismatch for each antenna of one or more antennas of the antenna array based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless devices, and
adjusting transmission coefficients according to the amplitude mismatch of each antenna.

16. The method of claim 9 , wherein calibrating the wireless MIMO device comprises:
estimating a phase mismatch and an amplitude mismatch for each antenna of one or more antennas of the antenna array based on the received plurality of calibration signals and based on the known directions from the wireless MIMO device to each proximate wireless MIMO device of the plurality of proximate wireless devices, and
adjusting transmission coefficients according to the phase mismatch and the amplitude mismatch of each antenna.

17. The method of claim 9 , wherein each proximate wireless MIMO device of the plurality of proximate wireless MIMO devices transmits a respective calibration signal of the plurality of calibration signals in omnidirectional transmission mode.

18. A system, comprising:
a wireless multiple-input and multiple-output (MIMO) device comprising an array of antennas; and
a plurality of proximate wireless MIMO devices;
wherein the wireless MIMO de

Assignees

• Huawei Tech Co Ltd

Inventors

• Kobzantsev Alexander
• Ezri Doron
• Weitzman Avi
• Pan Chun
• Jiang Xingfeng
• Fu Jie

Classifications

• H04B17/221

  of receiver antennas, e.g. as to amplitude or phase · CPC title

• H04B7/0617

  for beam forming · CPC title

• H04B7/0413

  MIMO systems · CPC title

• H04B17/12 Primary

  of transmit antennas, e.g. of the amplitude or phase · CPC title

• H04B17/21

  for calibration; for correcting measurements · CPC title