Configurable Spatial Channel Information Feedback in Wireless Communication System

• US 20110085610A1
• Filed: 10/12/2009
• Published: 04/14/2011
• Est. Priority Date: 10/12/2009
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Sayana, Krishna Kamal, Zhuang, Xiangyang, Stewart, Kenneth A.
• Granted Patent: US 8,873,650 B2
• Time in Patent Office: Days
• US Class Current: 375/260
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation

Abstract

A method for configurable spatial channel information feedback in wireless communication systems is disclosed including receiving, at the wireless communication device, transmission from a plurality of antennas, receiving an indication of a feedback mode for feeding back spatial channel information that is based on correlations among at least some of the plurality of antennas, decomposing a correlation matrix representative of the correlations among at least some of the plurality of antennas into at least two Kronecker components, and feeding back parameters representative of the Kronecker components according to the feedback mode indicated.

Claims

1. A method in a wireless communication device for providing spatial channel information feedback, the method comprising:

receiving, at the wireless communication device, transmission from a plurality of antennas;

receiving, at the wireless communication device, an indication of a feedback mode for feeding back spatial channel information, the spatial channel information based on correlations among at least some of the plurality of antennas;

decomposing, at the wireless communication device, a correlation matrix representative of the correlations among at least some of the plurality of antennas into at least two Kronecker components,

feeding back, from the wireless communication device, parameters representative of the Kronecker components according to the feedback mode indicated.

2. The method of claim 1, wherein the plurality of antennas further comprises transmit antennas of a plurality of cells or a single cell.

3. The method of claim 1, where a plurality of antennas correspond to a plurality of physical antennas or a plurality of virtualized antennas, wherein the corresponding virtualization is the operation of applying a set of weightings onto a signal before transmission from the plurality of physical antennas.

4. The method of claim 1, receiving the transmission from a plurality of virtual antennas wherein a corresponding virtualization scheme is indicated to the wireless communication device.

5. The method of claim 1, receiving the transmission from a plurality of virtual antennas wherein a corresponding virtualization scheme is applied by a base station dynamically.

6. The method of claim 1, wherein decomposing the correlation matrix into at least two Kronecker components further comprises approximating the correlation matrix as a Kronecker product of the Kronecker components, wherein the approximation is based on a matrix norm.

7. The method of claim 1, wherein at least one of the Kronecker components is a Hermitian matrix.

8. The method of claim 1 further comprising feeding back the parameters representative of at least one of the Kronecker components at a different temporal interval than the parameters representative of another Kronecker component.

9. The method of claim 1 further comprising,

feeding back the parameters representative of the Kronecker components according to the feedback mode indicated for a set of sub-bands,

wherein the parameters representative of at least one of the Kronecker components for the set of sub-bands is the same.

10. The method of claim 1 further comprising generating the parameters representative of the Kronecker components by extracting unique entries from the Kronecker components.

11. The method of claim 1 further comprising generating the parameters representative of the Kronecker components by extracting Eigen information according to the feedback mode indicated based on an Eigenvalue decomposition of the Kronecker components.

12. A method in a wireless communication device for providing spatial channel information feedback, the method comprising:

receiving, at the wireless communication device, transmission from a plurality of antennas;

receiving, at the wireless communication device, an indication of a feedback mode for feeding back spatial channel information, the feedback mode specifying a subset of the plurality of antennas on which the spatial channel information is based;

generating parameters representative of the spatial channel information based on correlations among the sub-set of the plurality of antennas specified;

feeding back, from the wireless communication device, the parameters according to the feedback mode indicated.

13. The method of claim 12 further comprising receiving, at the wireless communication device, an indication of a feedback mode specifying a first subset of the plurality of antennas on which a first spatial channel information is based and a second subset of the plurality of antennas on which a second spatial channel information is based.

14. The method of claim 12, wherein the plurality of antennas further comprises transmit antennas of a single cell.

15. The method of claim 12, wherein the plurality of antennas further comprises transmit antennas of a plurality of cells.

16. The method of claim 12, where the plurality of antennas correspond to a plurality of physical antennas or a plurality of virtualized antennas, wherein a corresponding virtualization is an operation of applying a set of weightings onto a signal before transmission from the plurality of physical antennas.

17. The method of claim 12 further comprising decomposing a correlation matrix representative of the correlations among the sub-set of antennas into at least two Kronecker components, wherein the parameters are representative of the Kronecker components.

18. The method of claim 12 further comprising generating the parameters representative of the spatial channel information by extracting unique entries from a correlation matrix representative of the correlations among the sub-set of the plurality of antennas specified.

19. The method of claim 12 further comprising generating the parameters representative of the spatial channel information by extracting Eigen information according to the feedback mode indicated based on an Eigenvalue decomposition of a correlation matrix representative of the correlations among the sub-set of the plurality of antennas specified.

20. A method in a wireless communication base station, the method comprising:

transmitting, from the base station to a mobile station, an indication of a feedback mode for feeding back spatial channel information from the mobile station to the base station,

the spatial channel information based on a correlation matrix representative of correlations among at least some of a plurality of antennas observed at the mobile station wherein the correlation matrix is decomposed into at least two Kronecker components; and

receiving, at the base station, parameters representative of the Kronecker components from the mobile station according to the feedback mode indicated.