Method and system for bits and coding assignment utilizing Eigen beamforming with fixed rates for closed loop WLAN

• US 8,014,353 B2
• Filed: 11/10/2009
• Issued: 09/06/2011
• Est. Priority Date: 11/12/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kim, Joonsuk
• Primary Examiner(s): Bhattacharya; Sam
• Application Number:
  US12/616,086
• Publication Number:
  US 20100144280A1
• Time in Patent Office: 665 Days
• Field of Search: 370/329, 370/334, 370/338, 370/394
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0013 Rate matching, e.g. puncturing or repetition of code symbols
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

A method and system for bits and coding assignment utilizing Eigen beamforming with fixed rates for a closed loop WLAN is provided. Aspects of the method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antennas and receiving feedback information related to the plurality of RF channels. Bits may be assigned for transmission via at least one of the plurality of RF channels based on the feedback information. At least a portion of subsequent data having at least a first coding rate based on the assignment of bits may be transmitted via at least one of the plurality of RF channels. The method may also comprise receiving data via a plurality of RF channels utilizing a plurality of receiving antennas, and transmitting feedback information related to the plurality of RF channels.

Claims

1. A method for communicating information in a communication system, the method comprising:

performing by one or more circuits and/or processors;

computing, for each of a generated plurality of spatial stream signals, a corresponding signal to noise ratio for each of a plurality of frequencies;

computing, for said each of said generated plurality of spatial stream signals, a corresponding geometric mean signal to noise ratio based on said computed plurality of corresponding signal to noise ratios;

selecting a corresponding modulation type identifier, for said each of said generated plurality of spatial stream signals, based on said computed corresponding geometric mean signal to noise ratio; and

communicating, via one or more uplink RF channels, feedback information comprising one or both of said selected plurality of corresponding modulation type identifiers and said computed plurality of corresponding geometric mean signal to noise ratios.

2. The method according to claim 1, comprising generating said plurality of spatial stream signals based on a concurrently received plurality of signals.

3. The method according to claim 2, comprising receiving said concurrently received plurality of signals via a corresponding plurality of downlink RF channels.

4. The method according to claim 3, wherein each of said corresponding plurality of downlink RF channels comprises at least a portion of said plurality of frequencies.

5. The method according to claim 1, comprising computing a corresponding number of bits for each of said computed plurality of corresponding geometric mean signal to noise ratios.

6. The method according to claim 5, comprising selecting each of said plurality of corresponding modulation type identifiers based on said computed corresponding number of bits.

7. The method according to claim 1, comprising selecting said corresponding modulation type identifier for each of said plurality of frequencies that is associated with a corresponding one of said generated plurality of spatial stream signals.

8. A system for communicating information in a communication system, the system comprising:

one or more circuits that are operable to compute, for each of a generated plurality of spatial stream signals, a corresponding signal to noise ratio for each of a plurality of frequencies;

said one or more circuits are operable to compute, for said each of said generated plurality of spatial stream signals, a corresponding geometric mean signal to noise ratio based on said computed plurality of corresponding signal to noise ratios;

said one or more circuits are operable to select a corresponding modulation type identifier, for said each of said generated plurality of spatial stream signals, based on said computed corresponding geometric mean signal to noise ratio; and

said one or more circuits are operable to communicate, via one or more uplink RF channels, feedback information comprising one or both of said selected plurality of corresponding modulation type identifiers and said computed plurality of corresponding geometric mean signal to noise ratios.

9. The system according to claim 8, wherein said one or more circuits are operable to generate said plurality of spatial stream signals based on a concurrently received plurality of signals.

10. The system according to claim 9, wherein said one or more circuits are operable to receive said concurrently received plurality of signals via a corresponding plurality of downlink RF channels.

11. The system according to claim 10, wherein each of said corresponding plurality of downlink RF channels comprises at least a portion of said plurality of frequencies.

12. The system according to claim 8, wherein said one or more circuits are operable to compute a corresponding number of bits for each of said computed plurality of corresponding geometric mean signal to noise ratios.

13. The system according to claim 8, wherein said one or more circuits are operable to select each of said plurality of corresponding modulation type identifiers based on said computed corresponding number of bits.

14. The system according to claim 8, wherein said one or more circuits are operable to select said corresponding modulation type identifier for each of said plurality of frequencies that is associated with a corresponding one of said generated plurality of spatial stream signals.

20. The system according to claim 12, wherein said one or more circuits are operable to select a determined modulation type identifier for each of said plurality of corresponding selected modulation type identifiers.

15. A system for communicating information in a communication system, the system comprising:

one or more circuits that are operable to compute, for each of a generated plurality of spatial stream signals, a corresponding signal to noise ratio for each of a plurality of frequencies;

said one or more circuits are operable to compute, for said each of said generated plurality of spatial stream signals, a corresponding geometric mean signal to noise ratio based on said computed plurality of corresponding signal to noise ratios;

said one or more circuits are operable to select a corresponding coding rate identifier, for said each of said generated plurality of spatial stream signals, based on one or both of said computed corresponding geometric mean signal to noise ratio and a corresponding selected modulation type identifier; and

said one or more circuits are operable to communicate, via one or more uplink RF channels, feedback information comprising one or more of said selected plurality of corresponding coding rate identifiers, said computed plurality of corresponding geometric mean signal to noise ratios and/or said plurality of corresponding selected modulation type identifiers.

16. The system according to claim 15, wherein said one or more circuits are operable to generate said plurality of spatial stream signals based on a concurrently received plurality of signals.

17. The system according to claim 16, wherein said one or more circuits are operable to receive said concurrently received plurality of signals via a corresponding plurality of downlink RF channels.

18. The system according to claim 17, wherein each of said corresponding plurality of downlink RF channels comprises at least a portion of said plurality of frequencies.

19. The system according to claim 15, wherein said one or more circuits are operable to select each of said plurality of corresponding coding rate identifiers based on a corresponding selected packet error rate value.

21. A system for communicating information in a communication system, the system comprising:

one or more processors and/or circuits in a transmitter, said transmitter comprising a plurality of antennas, wherein said one or more processors and/or circuits are operable to;

concurrently transmit, to a single receiving device, data via a plurality of RF channels via said plurality of transmitting antennas;

receive feedback information related to said plurality of RF channels;

assign bits for transmission via said plurality of transmitting antennas based on said feedback information; and

transmit at least a portion of subsequent data having at least a first coding rate based on said assignment of bits via said at least one of said plurality of RF channels.

22. The system according to claim 21, wherein said one or more processors and/or circuits are operable to code at least a portion of said assigned bits utilizing said first coding rate in said transmitter.

23. The system according to claim 21, wherein said one or more processors and/or circuits are operable to compute said first coding rate in said transmitter based on said received feedback information for transmitting said at least a portion of said subsequent data.

24. The system according to claim 21, wherein said received feedback information is based on channel estimation information for at least a portion of said plurality of RF channels.

25. The system according to claim 21, wherein said received feedback information is based on signal to noise ratio information for at least a portion of said plurality of RF channels.

26. The system according to claim 25, wherein said signal to noise ratio information is computed based on at least one transmitted tone for at least one of said plurality of RF channels.

27. The system according to claim 21, wherein said one or more processors and/or circuits are operable to compute at least a second coding rate in said transmitter based on said received feedback information for transmitting at least a remaining portion of said subsequent data.

28. The system according to claim 27, wherein said processor is operable to code at least a portion of said assigned bits utilizing said second coding rate in said transmitter.

29. The system according to claim 27, wherein said one or more processors and/or circuits are operable to transmit said at least said remaining portion of said subsequent data having said at least said second coding rate via said at least one of said plurality of RF channels.

30. The system according to claim 21, wherein said one or more processors and/or circuits are reassign bits for transmission based on updated received feedback information related to said plurality of RF channels.