Method and apparatus for pre-coding frequency division duplexing system

• US 20070097889A1
• Filed: 10/27/2005
• Published: 05/03/2007
• Est. Priority Date: 10/27/2005
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Wang, Jibing, Kadous, Tamer, Gore, Dhananjay
• Granted Patent: US 9,172,453 B2
• Time in Patent Office: Days
• US Class Current: 370/281
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• 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

Abstract

Accordingly, a method and apparatus are provided wherein a receiver system selects a pre-coding matrix, comprising eigen-beamforming weights, to use and provides rank value and matrix index associated with the selected matrix to the transmitter system. The transmitter system upon receiving the rank value and matrix index, determine if the matrix associated with the matrix index provided by the receiver system can be used. If not, them transmitter system selects another matrix for determining eigen-beamforming weights.

Claims

1. An apparatus operable in a wireless communication system, the apparatus comprising:

means for determining a rank value;

means for determining a matrix index; and

means for transmitting said reverse link message comprising a matrix index and said rank value.

2. The apparatus as claimed in claim 1, wherein said means for determining said rank value comprises means for measuring channel estimates.

3. The apparatus as claimed in claim 1, wherein said means for determining said rank value comprises means for measuring amount of interference.

4. The apparatus as claimed in claim 1, wherein said means for determining said matrix index comprises means for using said determined rank value.

5. The apparatus as claimed in claim 1, wherein said means for determining said matrix index comprises means for analyzing each matrix of a plurality of matrices stored in memory.

6. The apparatus as claimed in claim 1, wherein said means for determining said matrix index comprises means for selecting highest spectral efficiency.

7. An apparatus operable in a wireless communication system, the apparatus comprising:

receiving a rank value and a matrix index;

extracting a matrix comprising beamforming weight values using said rank value and said matrix index; and

determining if said extracted matrix should be used.

8. The apparatus as claimed in claim 7, further comprising means for extracting said matrix index using said received rank value.

9. The apparatus as claimed in claim 7, further comprising means for determining number of bits to demodulate to determine said matrix index.

10. The apparatus as claimed in claim 9, wherein means for determining number of bits to demodulate comprises means for analyzing said rank value.

11. A method of pre-coding in a wireless communication system, the method comprising:

determining a rank value;

determining a matrix index; and

transmitting said reverse link message comprising a matrix index and said rank value.

12. The method as claimed in claim 11, wherein said determining said rank value comprises of measuring channel estimates.

13. The method as claimed in claim 11, wherein said determining said rank value comprises of measuring amount of interference.

14. The method as claimed in claim 11, wherein said determining said matrix index comprises using said determined rank value.

15. The method as claimed in claim 11, wherein said determining said matrix index comprises analyzing each matrix of a plurality of matrices stored in memory.

16. The method as claimed in claim 11, wherein said determining said matrix index comprises of selecting highest spectral efficiency.

17. The method of pre-coding in a wireless communication system, the method comprising:

receiving a rank value and a matrix index;

extracting a matrix comprising beamforming weight values using said rank value and said matrix index; and

determining if said extracted matrix should be used.

18. The method as claimed in claim 17, further comprising extracting said matrix index using said received rank value.

19. The method as claimed in claim 17, further comprising determining number of bits to demodulate to determine said matrix index.

20. The method as claimed in claim 19, wherein determining number of bits to demodulate comprises of analyzing said rank value.

21. In a wireless communication, an apparatus comprising:

a processor, said processor configured to determine a rank value;

said processor further configured to determine a matrix index; and

said processor further configured to transmit said reverse link message comprising a matrix index and said rank value.

22. The apparatus as claimed in claim 21, wherein said processor further configured to measure channel estimates wherein said measured channel estimates are used to determine rank value.

23. The apparatus as claimed in claim 21, wherein said processor further configured to measure amount of interference wherein said measured channel estimates are used to determine rank value.

24. The apparatus as claimed in claim 21, wherein said processor further configured to use said determined rank value to determine said matrix index.

25. The apparatus as claimed in claim 21, wherein said processor further configured to analyze each matrix of a plurality of matrices stored in memory to determine said matrix index.

26. The apparatus as claimed in claim 21, wherein said processor further configured to select highest spectral efficiency to determine said matrix index.

27. In a wireless communication, an apparatus comprising:

a processor, said processor configured to receive a rank value and a matrix index;

said processor further configured to extract a matrix comprising beamforming weight values using said rank value and said matrix index; and

said processor further configured to determine if said extracted matrix should be used.

28. The apparatus as claimed in claim 27, said processor further configured to extract said matrix index using said received rank value.

29. The apparatus as claimed in claim 27, said processor further configured to further to determine number of bits to demodulate to determine said matrix index.

30. The apparatus as claimed in claim 29, said processor further configured to analyze said rank value to determining number of bits to demodulate.

31. A machine-readable medium comprising instructions which, when executed by a machine, cause the machine to perform operations including:

means for determining a rank value;

means for determining a matrix index; and

means for transmitting said reverse link message comprising a matrix index and said rank value.

32. The machine-readable medium of claimed in claim 31, wherein said means for determining said matrix index comprises means for using said determined rank value.

33. The machine-readable medium of as claimed in claim 31, wherein said means for determining said matrix index comprises means for analyzing each matrix of a plurality of matrices stored in memory.

34. An apparatus operable in a wireless communication system, the apparatus comprising:

receiving a rank value and a matrix index;

extracting a matrix comprising beamforming weight values using said rank value and said matrix index; and

determining if said extracted matrix should be used.

35. The machine-readable medium of claimed in claim 34, wherein means for determining number of bits to demodulate comprises means for analyzing said rank value.