ANTENNA CALIBRATION METHOD, SYSTEM AND APPARATUS

• US 20150341096A1
• Filed: 02/06/2013
• Published: 11/26/2015
• Est. Priority Date: 02/16/2012
• Status: Active Grant

• Current Assignee: Datang Mobile Communications Equipment Company Limited (China Information Communication Technology Group Co. Ltd.), CICT Mobile Communication Technology Company Limited
• Original Assignee: China Academy of Telecom Technology (China Information Communication Technology Group Co. Ltd.)
• Inventors: GAO, Qiubin, ZHANG, Ranran
• Granted Patent: US 9,419,698 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/56 with provision for simultaneous communication in two directions
• CPC Class Codes: H04B 17/21 for calibration; for correcting measurements
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition

Abstract

An embodiment of the present invention relates to the technical field of wireless communications, in particular to an aerial calibration method, system and device. In the prior art, an air interface calibration method involving a user equipment (UE) requires the UE to feed back a channel coefficient, and a channel coefficient direct quantization method occupies a great deal of uplink overhead and reduces system efficiency. The present invention solves the above problem. The method in the embodiment of the present invention comprises: the UE measures a downlink channel and determines a downlink channel matrix; the UE determines a first weighting matrix for aerial calibration according to the downlink channel matrix; the UE notifies a network side of the determined first weighting matrix. In the embodiment of the present invention, a UE decomposes the characteristic value of the downlink channel matrix, or reports the identifier corresponding to the first weighting matrix to the network side device, thus reducing the occupied uplink overhead and improving system efficiency.

Claims

1. An antenna calibration method, wherein the method comprises:

a user equipment performing downlink channel measurement and determining a downlink channel matrix;

the user equipment determining a first weight matrix for antenna calibration based on the downlink channel matrix; and

the user equipment notifying the network side of the determined first weight matrix.

2. The method of claim 1, wherein the user equipment determining the first weight matrix comprises:

the user equipment performing eigen value decomposition on the downlink channel matrix and determining an eigen vector corresponding to the maximum eigen value as the first weight matrix; and

the user equipment notifying the network side of the determined first weight matrix comprises;

the user equipment quantizing and then reporting respective elements in the first weight matrix.

3. The method of claim 1, wherein the user equipment determining the first weight matrix comprises:

the user equipment selecting a first weight matrix from a set of first weight matrices according to the downlink channel matrix.

4. The method of claim 3, wherein the user equipment notifying the network side of the determined first weight matrix comprises:

the user equipment determining the identifier corresponding to the selected first weight matrix in the set of first weight matrices and reporting the determined identifier.

5. The method of claim 1, wherein the user equipment performing downlink channel measurement comprises:

the user equipment performing downlink channel measurement based on a frequency range notified by the network side and/or specific sub-frames notified by the network side.

6. The method according to claim 1, wherein the method further comprises:

the user equipment transmitting an uplink pilot signal based on a frequency range notified by the network side and/or specific sub-frames notified by the network side.

7. An antenna calibration method, wherein the method comprises:

a network-side apparatus performing uplink channel measurement and determining an uplink channel matrix;

the network-side apparatus determining calibration coefficients based on the uplink channel matrix and a received first weight matrix from a user equipment; and

the network-side apparatus performing antenna calibration based on the determined calibration coefficients.

8. The method of claim 7, wherein the received first weight matrix is determined by the network-side apparatus from a set of first weight matrices according to the received identifier, of the first weight matrix, reported by the user equipment.

9. The method of claim 7, wherein the received first weight matrix is determined by the network-side apparatus according to respective received elements, in the first weight matrix, reported by the user equipment.

10. The method of claim 7, wherein the network-side apparatus receives one first weight matrix;

and

the network-side apparatus determines the calibration coefficients by the equation of;

11. The method of claim 7, wherein the network-side apparatus receives multiple first weight matrices;

and

the network-side apparatus determines the calibration coefficients in the equation of;

12. The method of claim 7, wherein the network-side apparatus determining the calibration coefficients comprises:

the network-side apparatus determining a second weight matrix from the uplink channel matrix; and

the network-side apparatus determining the calibration coefficients from the first weight matrix and the second weight matrix

13. The method of claim 12, wherein the network-side apparatus determining the second weight matrix comprises:

the network-side apparatus performing eigen value decomposition on the uplink channel matrix and determining an eigen vector corresponding to the maximum eigen value as the second weight matrix;

or

the network-side apparatus selecting a second weight matrix from a set of second weight matrices according to the uplink channel matrix.

14. The method of claim 12, wherein the network-side apparatus determining the calibration coefficients comprises:

for an antenna, the network-side apparatus dividing an element in the second weight matrix corresponding to the antenna by an element in the first weight matrix corresponding to the antenna as a calibration coefficient corresponding to the antenna.

15. The method of claim 12, wherein the network-side apparatus determining the calibration coefficients comprises:

if the network-side apparatus receives multiple first weight matrices, then the network-side apparatus determining a calibration coefficient from each of the first weight matrices; and

the network-side apparatus averaging calibration coefficients into resulting calibration coefficients or determining eigen vectors corresponding to the maximum eigen values of the matrix in the following equation as resulting calibration coefficients;

16-26. -26. (canceled)

27. An antenna calibration network-side apparatus, wherein the network-side apparatus comprises:

an uplink matrix determination module configured to perform uplink channel measurement and to determine an uplink channel matrix;

a coefficient determination module configured to determine calibration coefficients based on the uplink channel matrix and a received first weight matrix from a user equipment; and

a calibration module configured to perform antenna calibration based on the determined calibration coefficients.

28. The network-side apparatus of claim 27, wherein the received first weight matrix is determined by the coefficient determination module from a set of first weight matrices according to the received identifier, of the first weight matrix, reported by the user equipment.

29. The network-side apparatus of claim 27, wherein the received first weight matrix is determined by the coefficient determination module according to respective received elements, in the first weight matrix, reported by the user equipment.

30. The network-side apparatus of claim 27, wherein if one first weight matrix is received, then the coefficient determination module is further configured to determine the calibration coefficients in the equation of:

31. The network-side apparatus of claim 27, wherein if multiple first weight matrices are received, then the coefficient determination module is further configured to determine the calibration coefficients in the equation of:

32. The network-side apparatus of claim 27, wherein the coefficient determination module is further configured:

to determine a second weight matrix from the uplink channel matrix and to determine the calibration coefficients from the first weight matrix and the second weight matrix.

33. The network-side apparatus of claim 32, wherein the coefficient determination module is further configured:

to perform eigen value decomposition on the uplink channel matrix and to determine an eigen vector corresponding to the maximum eigen value as the second weight matrix;

or to select a second weight matrix from a set of second weight matrices according to the uplink channel matrix.

34. The network-side apparatus of claim 32, wherein the coefficient determination module is further configured:

for an antenna, to divide an element in the second weight matrix corresponding to the antenna by an element in the first weight matrix corresponding to the antenna as a calibration coefficient corresponding to the antenna.

35. The network-side apparatus of claim 32, wherein the coefficient determination module is further configured:

if the network-side apparatus receives multiple first weight matrices, to determine a calibration coefficient from each of the first weight matrices and to average calibration coefficients into resulting calibration coefficients;

or to determine eigen vectors corresponding to the maximum eigen values of the matrices in the following equation as resulting calibration coefficients;

36-41. -41. (canceled)