Wireless device and radio frequency channel calibration method

• US 9,992,776 B2
• Filed: 10/16/2017
• Issued: 06/05/2018
• Est. Priority Date: 10/17/2016
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Ruan, Wei, Li, Qian, Wang, Mingyue, Tan, Hongyi, Zhao, Xi
• Primary Examiner(s): Figueroa, Marisol
• Application Number:
  US15/784,940
• Publication Number:
  US 20180110038A1
• Time in Patent Office: 232 Days
• CPC Class Codes: G01S 11/02 using radio waves G01S19/00 takes precedence
• CPC Class Codes: H01Q 3/267 Phased-array testing or checking devices
• CPC Class Codes: H04B 17/11 for calibration
• CPC Class Codes: H04B 17/12 of transmit antennas, e.g. of the amplitude or phase
• CPC Class Codes: H04B 17/14 of the whole transmission and reception path, e.g. self-test loop-back
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

A wireless device and a radio frequency channel calibration method, where the wireless device includes a first radio frequency circuit and a second radio frequency circuit that operate on a same frequency band, and a processor. The first radio frequency circuit is configured to send a calibration signal using a calibration antenna. The second radio frequency circuit is configured to receive the calibration signal using each of at least two to-be-calibrated antennas. The second radio frequency circuit corresponds to at least two radio frequency channels, the at least two radio frequency channels respectively correspond to the at least two to-be-calibrated antennas. The processor is configured to determine a device phase difference of each of the at least two radio frequency channels, and calibrate a corresponding radio frequency channel using the device phase difference of each of the at least two radio frequency channels.

Claims

1. A wireless device, comprising:

a first radio frequency circuit;

a second radio frequency circuit; and

a processor coupled to the first radio frequency circuit and the second radio frequency circuit,

wherein the first radio frequency circuit and the second radio frequency circuit operate on a same frequency band,

wherein the first radio frequency circuit is coupled to a calibration antenna and configured to send a calibration signal using the calibration antenna,

wherein the second radio frequency circuit is coupled to at least two to-be-calibrated antennas and configured to receive the calibration signal using each of the at least two to-be-calibrated antennas,

wherein the second radio frequency circuit corresponds to at least two radio frequency channels,

wherein the at least two radio frequency channels respectively correspond to the at least two to-be-calibrated antennas,

wherein a quantity of the at least two radio frequency channels is the same as a quantity of the at least two to-be-calibrated antennas, and

wherein the processor is configured to;

calibrate a corresponding radio frequency channel using a device phase difference of each of the at least two radio frequency channels,

wherein the device phase difference is a difference between a receive phase difference and a distance phase difference of the corresponding radio frequency channel,

wherein the receive phase difference of the corresponding radio frequency channel is a phase difference between the calibration signal received on the corresponding radio frequency channel and the calibration signal received on a reference radio frequency channel,

wherein the distance phase difference of the corresponding radio frequency channel is based on a distance difference of the corresponding radio frequency channel and a channel phase difference of the calibration signal, and

wherein the distance difference of the corresponding radio frequency channel is a difference between a distance from a to-be-calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from a to-be-calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna.

2. The wireless device according to claim 1, wherein the processor is further configured to switch a channel on which the first radio frequency circuit operates and a channel on which the second radio frequency circuit operates, and wherein the frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

3. The wireless device according to claim 1, wherein the processor is further configured to switch a channel on which the first radio frequency circuit operates, and wherein the frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

4. The wireless device according to claim 1, wherein the processor is further configured to switch a channel on which the second radio frequency circuit operates, and wherein the frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

5. The wireless device according to claim 1, wherein the processor is a baseband chip.

6. The wireless device according to claim 1, wherein the processor is a central processing unit.

7. The wireless device according to claim 1, further comprising a plurality of second radio frequency circuits coupled to the first radio frequency circuit and the processor.

8. A radio frequency channel calibration method, comprising:

sending, by a first radio frequency circuit of a wireless device, a calibration signal using a calibration antenna;

receiving, by a second radio frequency circuit of the wireless device, the calibration signal using at least two to-be-calibrated antennas, wherein the second radio frequency circuit corresponds to at least two radio frequency channels, wherein the at least two radio frequency channels respectively correspond to the at least two to-be-calibrated antennas, wherein the calibration antenna and the at least two to-be-calibrated antennas are located in the wireless device, and wherein a quantity of the at least two radio frequency channels is the same as a quantity of the at least two to-be-calibrated antennas;

determining, by the wireless device, a device phase difference of each of the at least two radio frequency channels, wherein the device phase difference is a difference between a receive phase difference and a distance phase difference of a corresponding radio frequency channel, wherein the receive phase difference of the corresponding radio frequency channel is a phase difference between the calibration signal received on the corresponding radio frequency channel and the calibration signal received on a reference radio frequency channel, wherein the distance phase difference of the corresponding radio frequency channel is based on a distance difference of the corresponding radio frequency channel and a channel phase difference of the calibration signal, and wherein the distance difference of the corresponding radio frequency channel is a difference between a distance from a to-be-calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from a to-be-calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna; and

calibrating, by the wireless device, the corresponding radio frequency channel using the device phase difference of each of the at least two radio frequency channels.

9. The method according to claim 8, further comprising switching, by the wireless device, channels of the first radio frequency circuit and the second radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

10. The method according to claim 8, further comprising switching, by the wireless device, channels of the first radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

11. The method according to claim 8, further comprising switching, by the wireless device, channels of the second radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

12. The method according to claim 8, wherein the wireless device comprises a plurality of second radio frequency circuits, and wherein after sending the calibration signal using the calibration antenna, the method further comprises:

receiving, by each of the plurality of second radio frequency circuits, the calibration signal using the at least two to-be-calibrated antennas, wherein each radio frequency circuit corresponds to at least two radio frequency channels;

determining, by the wireless device, the device phase difference of each of the at least two radio frequency channels corresponding to each radio frequency circuit; and

calibrating, by the wireless device, the corresponding radio frequency channel using the device phase difference of each of the at least two radio frequency channels corresponding to each radio frequency circuit.

13. A computer program product comprising a non-transitory computer readable storage medium storing program code thereon for radio frequency channel calibration, the program code comprising instructions for executing a method that comprises:

sending, by a first radio frequency circuit of a wireless device, a calibration signal using a calibration antenna;

receiving, by a second radio frequency circuit of the wireless device, the calibration signal using at least two to-be-calibrated antennas, wherein the second radio frequency circuit corresponds to at least two radio frequency channels, wherein the at least two radio frequency channels respectively correspond to the at least two to-be-calibrated antennas, wherein the calibration antenna and the at least two to-be-calibrated antennas are located in the wireless device, and wherein a quantity of the at least two radio frequency channels is the same as a quantity of the at least two to-be-calibrated antennas;

determining, by the wireless device, a device phase difference of each of the at least two radio frequency channels, wherein the device phase difference is a difference between a receive phase difference and a distance phase difference of a corresponding radio frequency channel, wherein the receive phase difference of the corresponding radio frequency channel is a phase difference between the calibration signal received on the corresponding radio frequency channel and the calibration signal received on a reference radio frequency channel, wherein the distance phase difference of the corresponding radio frequency channel is based on a distance difference of the corresponding radio frequency channel and a channel phase difference of the calibration signal, and wherein the distance difference of the corresponding radio frequency channel is a difference between a distance from a to-be-calibrated antenna corresponding to the corresponding radio frequency channel to the calibration antenna and a distance from a to-be-calibrated antenna corresponding to the reference radio frequency channel to the calibration antenna; and

calibrating, by the wireless device, the corresponding radio frequency channel using the device phase difference of each of the at least two radio frequency channels.

14. The computer program product according to claim 13, further comprising switching, by the wireless device, channels of the first radio frequency circuit and the second radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

15. The computer program product according to claim 13, further comprising switching, by the wireless device, channels of the first radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

16. The computer program product according to claim 13, further comprising switching, by the wireless device, channels of the second radio frequency circuit, wherein a frequency band on which the first radio frequency circuit and the second radio frequency circuit operate comprises a plurality of channels.

17. The computer program product according to claim 13, wherein the wireless device comprises a plurality of second radio frequency circuits, and wherein after sending the calibration signal using the calibration antenna, the method further comprises:

receiving, by each of the plurality of second radio frequency circuits, the calibration signal using the at least two to-be-calibrated antennas, wherein each radio frequency circuit corresponds to at least two radio frequency channels;

determining, by the wireless device, the device phase difference of each of the at least two radio frequency channels corresponding to each radio frequency circuit; and

calibrating, by the wireless device, the corresponding radio frequency channel using the device phase difference of each of the at least two radio frequency channels corresponding to each radio frequency circuit.