Method and system for SFBC/STBC transmission of orthogonally coded signals with angle feedback in a diversity transmission system

• US 7,995,457 B2
• Filed: 06/06/2007
• Issued: 08/09/2011
• Est. Priority Date: 04/16/2007
• Status: Expired due to Fees

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kim, Joonsuk
• Primary Examiner(s): Ngo; Ricky
• Assistant Examiner(s): MASUR, PAUL H
• Application Number:
  US11/759,203
• Publication Number:
  US 20080253337A1
• Time in Patent Office: 1,525 Days
• Field of Search: 370/208
• US Class Current: 370/208
• 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 1/0606 Space-frequency coding
• CPC Class Codes: H04L 1/0643 block codes
• CPC Class Codes: H04L 2025/03414 Multicarrier
• CPC Class Codes: H04L 2025/03426 transmission using multiple-input and multiple-output channels
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 25/03178 Arrangements involving sequence estimation techniques
• CPC Class Codes: H04L 25/03343 Arrangements at the transmitter end
• CPC Class Codes: H04L 25/03866 using scrambling
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling

Abstract

Aspects of a method and system for SFBC/STBC transmission of orthogonally coded signals with angle feedback in a diversity transmission system are presented. Exemplary aspects of the system may include one or more circuits that enables generation of a plurality of concurrently transmitted signal groups based on a computed matrix such that a product of the plurality of concurrently transmitted signal groups, the computed matrix and/or a transformed version of the computed matrix, may generate at least one set of orthogonal signals based on at least one rotation angle.

Claims

1. A method for processing signals in a communication system, the method comprising:

performing by one or more circuits;

generating, over a time window, a plurality of concurrently transmitted signal groups by selectively rotating a portion of a plurality of signal groups based on a computed matrix associated with a codeword transmission pattern, wherein said computed matrix is computed based on at least one rotation angle; and

transmitting said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix.

2. The method according to claim 1, comprising generating each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords.

3. The method according to claim 2, wherein a statistically computed value for each of said sequence of data symbols is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

4. The method according to claim 3, wherein said computed weighted average value is computed based on said computed matrix.

5. The method according to claim 2, wherein a statistically computed value for each of said sequence of codewords is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

6. The method according to claim 5, wherein said computed weighted average value is computed based on said computed matrix.

7. The method according to claim 1, comprising generating said plurality of concurrently transmitted signal groups based on at least one data stream.

8. The method according to claim 7, wherein each concurrently transmitted codeword within said plurality of concurrently transmitted signal groups comprises a distinct portion of tones, and corresponding data, contained within a data symbol from said at least one data stream.

9. The method according to claim 1, comprising computing said computed matrix based on a transfer function, which characterizes a communication medium utilized for transmitting said plurality of concurrently transmitted signal groups.

10. The method according to claim 1, comprising rotating or phase shifting, at a given time instant, at least a portion of said generated plurality of concurrently transmitted signal groups based on said at least one rotation angle.

11. The method according to claim 1, comprising computing said at least one rotation angle such that non-diagonal matrix elements in a computed square matrix are equal to zero.

12. The method according to claim 11, comprising computing said square matrix computed based on a mathematical product of said computed matrix and said transformed version of said computed matrix.

13. The method according to claim 1, comprising computing said at least one rotation angle based on channel feedback information.

14. A system for processing signals in a communication system, the system comprising:

one or more circuits that are operable to generate, over a time window, a plurality of concurrently transmitted signal groups by selectively rotating of a portion of a plurality of signal groups based on a computed matrix associated with a codeword transmission pattern, wherein said computed matrix is computed based on at least one rotation angle; and

said one or more circuits are operable to transmit said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix.

15. The system according to claim 14, wherein said one or more circuits are operable to generate each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords.

16. The system according to claim 15, wherein a statistically computed value for each of said sequence of data symbols is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

17. The system according to claim 16, wherein said computed weighted average value is computed based on said computed matrix.

18. The system according to claim 15, wherein a statistically computed value for each of said sequence of codewords is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

19. The system according to claim 18, wherein said computed weighted average value is computed based on said computed matrix.

20. The system according to claim 14, wherein said one or more circuits are operable to generate said plurality of concurrently transmitted signal groups based on at least one data stream.

21. The system according to claim 20, wherein each concurrently transmitted codeword within said plurality of concurrently transmitted signal groups comprises a distinct portion of tones, and corresponding data, contained within a data symbol from said at least one data stream.

22. The system according to claim 14, wherein said one or more circuits are operable to compute said computed matrix based on a transfer function, which characterizes a communication medium for transmitting said plurality of concurrently transmitted signal groups.

23. The system according to claim 14, wherein said one or more circuits are operable to rotate, or phase shifting, at a given time instant, at least a portion of said generated plurality of concurrently transmitted signal groups based on said at least one rotation angle.

24. The system according to claim 14, wherein said one or more circuits are operable to compute said at least one rotation angle such that non-diagonal matrix elements in a computed square matrix are equal to zero.

25. The system according to claim 24, wherein said one or more circuits are operable to compute said square matrix computed based on a mathematical product of said computed matrix and said transformed version of said computed matrix.

26. The system according to claim 14, wherein said one or more circuits are operable to compute said at least one rotation angle based on channel feedback information.

27. The system according to claim 14, wherein said one or more circuits comprise at least one processor and/or transmitter.

28. A method for processing signals in a communication system, the method comprising:

performing by one or more circuits;

generating, over a time window, a plurality of concurrently transmitted signal groups based on a computed matrix, wherein said computed matrix is computed based on at least one rotation angle;

transmitting said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix; and

generating each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords, wherein a statistically computed value for each of said sequence of data symbols is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

29. The method according to claim 28, wherein said computed weighted average value is computed based on said computed matrix.

30. A method for processing signals in a communication system, the method comprising:

performing by one or more circuits;

generating, over a time window, a plurality of concurrently transmitted signal groups based on a computed matrix, wherein said computed matrix is computed based on at least one rotation angle;

transmitting said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix; and

generating each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords, wherein a statistically computed value for each of said sequence of codewords is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

31. The method according to claim 30, wherein said computed weighted average value is computed based on said computed matrix.

32. A system for processing signals in a communication system, the system comprising:

one or more circuits that are operable to generate, over a time window, a plurality of concurrently transmitted signal groups based on a computed matrix, wherein said computed matrix is computed based on at least one rotation angle;

said one or more circuits are operable to transmit said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix; and

said one or more circuits are operable to generate each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords, wherein a statistically computed value for each of said sequence of data symbols is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

33. The system according to claim 32, wherein said computed weighted average value is computed based on said computed matrix.

34. A system for processing signals in a communication system, the system comprising:

one or more circuits that are operable to generate, over a time window, a plurality of concurrently transmitted signal groups based on a computed matrix, wherein said computed matrix is computed based on at least one rotation angle;

said one or more circuits are operable to transmit said plurality of concurrently transmitted signal groups, wherein said plurality of concurrently transmitted signal groups enable a receiver to generate at least one set of orthogonal signals by multiplying received signals, said received signals based on said plurality of concurrently transmitted signal groups, and a transformed version of said computed matrix; and

said one or more circuits are operable to generate each of said generated plurality of concurrently transmitted signal groups based on a sequence of data symbols or a sequence of codewords, wherein a statistically computed value for each of said sequence of codewords is proportional to a computed weighted average value of said transmitted plurality of concurrently transmitted signal groups.

35. The system according to claim 34, wherein said computed weighted average value is computed based on said computed matrix.