Antenna calibration method and apparatus, and remote radio frequency unit

Patent metadata

Field	Value
Publication number	US-12574124-B2
Application number	US-202218697466-A
Country	US
Kind code	B2
Filing date	Mar 21, 2022
Priority date	Sep 30, 2021
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

The present application provides an antenna calibration method and apparatus, and a remote radio unit. The method includes: generating a calibration sequence of a channel to be calibrated; determining, according to obtained calibration configuration information of the channel to be calibrated and an output sequence of the channel to be calibrated, a calibration response sequence of the channel to be calibrated; and calibrating the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated.

First claim

What is claimed is:

1 . An antenna calibration method, comprising:
generating a calibration sequence of a channel to be calibrated; determining, according to obtained calibration configuration information of the channel to be calibrated and an output sequence of the channel to be calibrated, a calibration response sequence of the channel to be calibrated, wherein the output sequence of the channel to be calibrated is a sequence obtained through the channel to be calibrated in response to an input sequence; and calibrating the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated, wherein the input sequence of the channel to be calibrated is a sequence obtained by a signal processing apparatus inserting the calibration sequence of the channel to be calibrated into a guard period (GP) of a data frame according to preset delay configuration information; and wherein the calibration configuration information comprises phase information of the GP and delay information, the phase information of the GP is used to characterize an interval between a head position of the GP and a header of a data frame, and the delay information is used to characterize an interval between the calibration sequence of the channel to be calibrated and the head position of the GP.

2 . The antenna calibration method according to claim 1 , wherein determining, according to the obtained calibration configuration information of the channel to be calibrated and the output sequence of the channel to be calibrated, the calibration response sequence of the channel to be calibrated comprises:
determining an initial acquisition position according to the phase information of the GP and the delay information, wherein the initial acquisition position corresponds to a start position of the calibration response sequence in the GP; and acquiring the output sequence of the channel to be calibrated according to the initial acquisition position, to obtain a calibration response sequence of the channel to be calibrated.

3 . The antenna calibration method according to claim 2 , wherein before determining the initial acquisition position according to the phase information of the GP and the delay information, the method further comprises:
separating, under a condition that the channel to be calibrated is transmitting channels of an antenna, the output sequence of each channel to be calibrated from a mixed sequence, wherein the mixed sequence is a sequence set which is received by a standard receiving channel and comprises output sequences of a plurality of channels to be calibrated.

4 . The antenna calibration method according to claim 2 , wherein after determining the initial acquisition position according to the phase information of the GP and the delay information, the method further comprises:
obtaining, under a condition of obtaining the output sequence of the channel to be calibrated according to the initial acquisition position, information of an attenuation factor of a variable gain amplifier (VGA) at an acquisition moment; and suspending, under a condition that the VGA is determined to be abnormal according to the information of the attenuation factor, an acquisition operation on the output sequence of the channel to be calibrated.

5 . The method according to claim 4 , wherein after suspending the acquisition operation on the output sequence of the channel to be calibrated, the method further comprises:
acquiring, under a condition that the VGA is determined to be recovered to normal, the output sequence of the channel to be calibrated again according to the calibration configuration information of the channel to be calibrated.

6 . The antenna calibration method according to claim 4 , wherein after obtaining, under the condition of obtaining the output sequence of the channel to be calibrated according to the initial acquisition position, information of the attenuation factor of the VGA at the acquisition moment, the method further comprises:
storing into a preset storage space the information of the attenuation factor, as well as the calibration response sequence of the channel to be calibrated acquired at the acquisition moment and corresponding to the information of the attenuation factor.

7 . The antenna calibration method according to claim 6 , wherein after suspending the acquisition operation on the output sequence of the channel to be calibrated, the method further comprises:
determining, according to the information of the attenuation factor, a calibration response sequence of the channel to be calibrated acquired during a period when the VGA is abnormal; and setting the calibration response sequence of the channel to be calibrated acquired during the period when the VGA is abnormal in the preset storage space to an invalid state.

8 . The antenna calibration method according to claim 7 , wherein before calibrating the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated, the method further comprises:
obtaining from the preset storage space calibration response sequences of the channel to be calibrated except that in the invalid state.

9 . The antenna calibration method according to claim 1 , wherein calibrating the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated comprises:
obtaining a compensation coefficient for the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated; and calibrating the channel to be calibrated according to the compensation coefficient for the channel to be calibrated.

10 . The antenna calibration method according to claim 9 , wherein obtaining the compensation coefficient for the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated comprises:
performing channel estimation on the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated, to obtain impact response information of the channel to be calibrated; obtaining an antenna weight of the channel to be calibrated according to the impact response information of the channel to be calibrated; and determining a compensation coefficient for the channel to be calibrated according to the antenna weight of the channel to be calibrated and an antenna weight of a preset standard reference channel.

11 . The antenna calibration method according to claim 10 , wherein the preset standard reference channel is a channel selected from a plurality of channels to be calibrated.

12 . The antenna calibration method according to claim 9 , wherein the calibration sequence is a periodic sequence, and the calibration response sequence is a periodic sequence having the same period as the calibration sequence; and
obtaining the compensation coefficient for the channel to be calibrated according to the calibration response sequence of the channel to be calibrated and the calibration sequence of the channel to be calibrated comprises: calculating a period compensation coefficient for the channel to be calibrated for each specified period according to the calibration response sequence and the calibration sequence; and calculating an average period compensation coeff

Assignees

• Sanechips Tech Co Ltd

Inventors

• Xiang Li
• Cui Hongwang
• Fan Keyan
• Guo Yan
• Wen Long

Classifications

• H04B17/21 Primary

  for calibration; for correcting measurements · CPC title

• H04B17/14

  of the whole transmission and reception path, e.g. self-test loop-back · CPC title

• H04B17/12

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

• H04B17/11 Primary

  for calibration · CPC title