TRANSMITTER BEAMFORMING STEERING MATRIX PROCESSING AND STORAGE

• US 20120014415A1
• Filed: 10/11/2010
• Published: 01/19/2012
• Est. Priority Date: 02/19/2009
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Atheros Communications Incorporated (Qualcomm, Inc.)
• Inventors: Zhang, Ning, Su, Chi-Lin, Peiris, Bemini Hennadige Janath
• Granted Patent: US 8,264,407 B2
• Time in Patent Office: Days
• US Class Current: 375/140
• CPC Class Codes: H01Q 3/2605 Array of radiating elements provided with a feedback control over the element weights, e.g. adaptive arrays
• CPC Class Codes: H04B 7/043 using best eigenmode, e.g. beam forming or beam steering
• CPC Class Codes: H04B 7/0617 for beam forming

Abstract

A mechanism for processing beamforming steering matrices in a transceiver system. A plurality of beamforming steering matrices associated with a plurality of subcarriers of an RF signal received at the transceiver system are generated. The beamforming steering matrices are compressed and stored. The beamforming steering matrices may also be grouped or sub-sampled prior to being stored. The beamforming steering matrices are decompressed and ungrouped before being applied to data to be transmitted. Prior to ungrouping the beamforming steering matrices, a phase difference between corresponding beamforming steering vectors of consecutive beamforming steering matrices is determined. Phase rotation is performed on the corresponding beamforming steering vectors based on the determined phase difference associated with the corresponding beamforming steering vectors to improve phase continuity between consecutive beamforming steering matrices.

Claims

1. A method comprising:

decompressing, at a transceiver system, a plurality of stored beamforming steering matrices, wherein the beamforming steering matrices are associated with a plurality of subcarriers of an RF signal received at the transceiver system;

determining, at the transceiver system, a phase difference between corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices of the plurality of beamforming steering matrices;

performing, at the transceiver system, phase rotation on the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices based on the determined phase difference associated with the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices to improve phase continuity between consecutive beamforming steering matrices;

interpolating, at the transceiver system, the beamforming steering matrices to ungroup the beamforming steering matrices; and

applying, at the transceiver system, the beamforming steering matrices to data to be transmitted by the transceiver system to generate beamformed data streams.

2. The method of claim 1, further comprising:

determining whether a phase difference between the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices is greater than

3. The method of claim 1, further comprising:

determining that the corresponding beamforming steering vectors of one or more pairs of consecutive beamforming steering matrices have a phase difference between the corresponding beamforming steering vectors; and

rotating, by the determined phase difference, one of the corresponding beamforming steering vectors of each of the one or more pairs of consecutive beamforming steering matrices.

4. The method of claim 1, further comprising:

generating the plurality of beamforming steering matrices associated with the plurality of subcarriers of the RF signal received at the transceiver system;

compressing the beamforming steering matrices; and

storing the beamforming steering matrices.

5. The method of claim 4, further comprising grouping the beamforming steering matrices prior to storing the beamforming steering matrices.

6. The method of claim 4, further comprising determining channel estimates for the plurality of subcarriers of the received RF signal.

7. The method of claim 6, further comprising performing singular value decomposition (SVD) on the channel estimates associated with the subcarriers of the received RF signal to generate the plurality of beamforming steering matrices.

8. The method of claim 4, wherein said generating the plurality of beamforming steering matrices comprises generating a beamforming steering matrix for each of the plurality of subcarriers associated with the received RF signal.

9. A transceiver comprising:

a steering matrix decompression unit operable to decompress a plurality of stored beamforming steering matrices, wherein the beamforming steering matrices are associated with a plurality of subcarriers of an RF signal received at the transceiver;

a phase estimation unit operable to determine a phase difference between corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices of the plurality of beamforming steering matrices;

a phase rotation unit operable to perform phase rotation on the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices based on the determined phase difference associated with the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices to improve phase continuity between consecutive beamforming steering matrices;

an interpolation unit operable to interpolate the beamforming steering matrices to ungroup the beamforming steering matrices; and

a beamforming processing unit operable to apply the beamforming steering matrices to data to be transmitted by the transceiver to generate beamformed data streams.

10. The transceiver of claim 9, wherein:

the phase estimation unit is operable to determine whether a phase difference between the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices is greater than

11. The transceiver of claim 9, wherein:

the phase estimation unit is operable to determine that the corresponding beamforming steering vectors of one or more pairs of consecutive beamforming steering matrices have a phase difference between the corresponding beamforming steering vectors; and

the phase rotation unit is operable to rotate, by the determined phase difference, one of the corresponding steering vectors of each of the one or more pairs of consecutive beamforming steering matrices.

12. The transceiver of claim 9, further comprising:

a steering matrix computation unit operable to generate the plurality of beamforming steering matrices associated with the plurality of subcarriers of the RF signal received at the transceiver;

a compression unit operable to compress the beamforming steering matrices; and

a storage unit operable to store the beamforming steering matrices.

13. The transceiver of claim 12, further comprising a grouping unit operable to group the beamforming steering matrices prior to the storage unit storing the beamforming steering matrices.

14. The transceiver of claim 12, further comprising a channel estimation unit operable to determine channel estimates for the plurality of subcarriers of the received RF signal.

15. The transceiver of claim 14, further comprising a singular value decomposition (SVD) unit operable to perform SVD on the channel estimates associated with the subcarriers of the received RF signal to generate the plurality of beamforming steering matrices.

16. One or more machine-readable storage media having stored therein a program product, which when executed by one or more processor units causes the one or more processor units to perform operations that comprise:

decompressing, at a transceiver system, a plurality of stored beamforming steering matrices, wherein the beamforming steering matrices are associated with a plurality of subcarriers of an RF signal received at the transceiver system;

determining, at the transceiver system, a phase difference between corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices of the plurality of beamforming steering matrices;

performing, at the transceiver system, phase rotation on the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices based on the determined phase difference associated with the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices to improve phase continuity between consecutive beamforming steering matrices;

interpolating, at the transceiver system, the beamforming steering matrices to ungroup the beamforming steering matrices; and

applying, at the transceiver system, the beamforming steering matrices to data to be transmitted by the transceiver system to generate beamformed data streams

17. The machine-readable storage media of claim 16, wherein the operations further comprise:

determining whether a phase difference between the corresponding beamforming steering vectors of each pair of consecutive beamforming steering matrices is greater than

18. The machine-readable storage media of claim 16, wherein the operations further comprise:

determining that the corresponding beamforming steering vectors of one or more pairs of consecutive beamforming steering matrices have a phase difference between the corresponding beamforming steering vectors; and

rotating, by the determined phase difference, one of the corresponding beamforming steering vectors of each of the one or more pairs of consecutive beamforming steering matrices.

19. The machine-readable storage media of claim 16, wherein the operations further comprise:

generating the plurality of beamforming steering matrices associated with the plurality of subcarriers of the RF signal received at the transceiver system;

compressing the beamforming steering matrices; and

storing the beamforming steering matrices.

20. The machine-readable storage media of claim 19, wherein the operations further comprise grouping the beamforming steering matrices prior to storing the beamforming steering matrices.

21. The machine-readable storage media of claim 19, wherein the operations further comprise determining channel estimates for the plurality of subcarriers of the received RF signal.

22. The machine-readable storage media of claim 21, wherein the operations further comprise performing singular value decomposition (SVD) on the channel estimates associated with the subcarriers of the received RF signal to generate the plurality of beamforming steering matrices.