METHOD AND SYSTEM FOR SFBC/STBC IN A COMMUNICATION DIVERSITY SYSTEM USING ANGLE FEEDBACK

• US 20080311873A1
• Filed: 09/28/2007
• Published: 12/18/2008
• Est. Priority Date: 06/18/2007
• Status: Active Grant

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kim, Joonsuk, Seshadri, Nambirajan, Ariyavisitakul, Sirikiat
• Granted Patent: US 8,254,507 B2
• Time in Patent Office: Days
• US Class Current: 455/272
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/068 using space frequency diversity space-frequency coding H04L1/0606
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 1/0675 characterised by the signaling
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

Aspects of a system for STBC/SFBC in a communication system using angle feedback may include a receiver, which enables reception of signals via a plurality of receiving antennas. The receiver may enable computation of a rotation factor value based on the received signals and utilization of the computed rotation factor value to receive subsequent signals via the plurality of receiving antennas. The received signals may comprise preamble data. The receiver may enable computation of channel estimate values based on the received preamble data. A rotation angle value may be computed based on the computed channel estimate values. The rotation factor value may be computed based on the computed rotation angle value. The receiver may enable transmission of feedback information comprising the computed rotation factor and/or the computed rotation angle.

Claims

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

receiving signals via a plurality of receiving antennas;

computing a rotation factor value based on said received signals; and

utilizing said computed rotation factor value to receive subsequent signals via said plurality of receiving antennas.

2. The method according to claim 1, wherein said received signals comprise preamble data.

3. The method according to claim 2, comprising computing channel estimate values based on said received preamble data.

4. The method according to claim 3, comprising computing a rotation angle value based on said computed channel estimates values.

5. The method according to claim 4, comprising computing said rotation factor value based on said computed rotation angle value.

6. The method according to claim 4, comprising transmitting feedback information comprising said computed rotation factor value and/or said computed rotation angle value.

7. The method according to claim 3, comprising generating a transfer function matrix based on said computed channel estimate values.

8. The method according to claim 7, comprising generating a square matrix by pre-multiplying said transfer function matrix by a transformed version of said transfer function matrix.

9. The method according to claim 8, wherein off-diagonal elements in said square matrix comprises crosstalk terms.

10. The method according to claim 9, comprising computing said rotation factor value such that the value for each said crosstalk term is approximately equal to zero.

12. The system according to claim 1, wherein said received signals comprise preamble data.

13. The system according to claim 2, wherein said one or more circuits enable computation of channel estimate values based on said received preamble data.

14. The system according to claim 3, wherein said one or more circuits enable computation of a rotation angle value based on said computed channel estimates values.

15. The system according to claim 4, wherein said one or more circuits enable computation of said rotation factor value based on said computed rotation angle value.

16. The system according to claim 4, wherein said one or more circuits enable transmission of feedback information comprising said computed rotation factor value and/or said computed rotation angle value.

17. The system according to claim 3, wherein said one or more circuits enable generation of a transfer function matrix based on said computed channel estimate values.

18. The system according to claim 7, wherein said one or more circuits enable generation of a square matrix by pre-multiplying said transfer function matrix by a transformed version of said transfer function matrix.

19. The system according to claim 8, wherein off-diagonal elements in said square matrix comprises crosstalk terms.

20. The system according to claim 9, wherein said one or more circuits enable computation of said rotation factor value such that the value for each said crosstalk term is approximately equal to zero.

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

one or more circuits that enable reception of signals via a plurality of receiving antennas;

said one or more circuits enable computation of a rotation factor value based on said received signals; and

said one or more circuits enable utilization of said computed rotation factor value to receive subsequent signals via said plurality of receiving antennas.