Method and system for diversity processing

• US 20060073797A1
• Filed: 06/30/2005
• Published: 04/06/2006
• Est. Priority Date: 10/06/2004
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kent, Mark, Landau, Uri M., Erceg, Vinko
• Granted Patent: US 7,643,839 B2
• Time in Patent Office: Days
• US Class Current: 455/132
• CPC Class Codes: H04B 1/711 the interference being multi-path interference
• CPC Class Codes: H04B 7/06 at the transmitting station
• 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 1/1867 Arrangements specially adapted for the transmitter end

Abstract

In an RF communication system, aspects for diversity processing may comprise processing a plurality of received multipath signals as clusters of signals. The received multipath signals may be diversity signals received from diversity transmit antennas at a base station. Timing information may be generated for tracking the clusters of signals. Complex phase and amplitude information may also be estimated for at least some of the multipath signals in the clusters of signals. At least a portion of the received multipath signals may be combined to form a single path processed diversity signal. A plurality of the single path processed diversity signals may be combined together, where each of the single path processed diversity signals may be derived from one of the plurality of diversity transmit antennas at the base station. The diversity signals may be transmitted via at least one of a plurality of diversity modes.

Claims

1. A method for processing received signals, the method comprising processing a plurality of received multipath signals as a plurality of clusters of signals, wherein said plurality of received multipath signals are diversity signals received from at least one of a plurality of diversity transmit antennas at a base station.

2. The method according to claim 1, further comprising generating timing information utilized for tracking at least a portion of said plurality of clusters of signals.

3. The method according to claim 1, further comprising estimating complex phase and amplitude information for at least a portion of said plurality of clusters of signals.

4. The method according to claim 1, further comprising providing coherent detection of and phase reference for said at least one of said plurality of diversity transmit antennas by monitoring at least one common pilot channel of said at least one of said plurality of diversity transmit antennas.

5. The method according to claim 1, further comprising combining at least a portion of said plurality of received multipath signals from one of said plurality of diversity transmit antennas to form a single path processed diversity signal.

6. The method according to claim 5, further comprising despreading at least a portion of said single path processed diversity signal.

7. The method according to claim 6, further comprising combining a plurality of said despread said single path processed diversity signals, wherein each said despread said single path processed diversity signal is derived from one of said plurality of diversity transmit antennas at said base station.

8. The method according to claim 1, further comprising combining said diversity signals transmitted by said plurality of diversity transmit antennas at said base station via at least one of a plurality of diversity modes.

9. The method according to claim 8, further comprising determining a plurality of channel weight information from at least one of:

dedicated pilot channel estimates and common pilot channel estimates.

10. The method according to claim 9, further comprising communicating said plurality of determined channel weight information to said base station for closed loop 1 diversity mode, wherein said closed loop 1 diversity mode is one of said plurality of diversity modes.

11. The method according to claim 9, further comprising communicating said plurality of determined channel weight information to said base station for closed loop 2 diversity mode, wherein said closed loop 2 diversity mode is one of said plurality of diversity modes.

12. The method according to claim 8, wherein said plurality of diversity modes comprise an open loop space-time transmit diversity mode.

13. A system for processing received signals, the system comprising circuitry that processes a plurality of received multipath signals as a plurality of clusters of signals, wherein said plurality of received multipath signals are diversity signals received from at least one of a plurality of diversity transmit antennas at a base station.

14. The system according to claim 13, further comprising at least one cluster path processor that generates timing information utilized to track at least a portion of said plurality of clusters of signals.

15. The system according to claim 13, wherein said at least one cluster path processor estimates complex phase and amplitude information for said at least a portion of said plurality of clusters of signals.

16. The system according to claim 13, further comprising at least one common pilot channel processor that provides coherent detection of and phase reference for said at least one of said plurality of diversity transmit antennas by monitoring at least one common pilot channel of said at least one of said plurality of diversity transmit antennas.

17. The system according to claim 13, further comprising at least one maximum ratio combiner that combines at least a portion of said plurality of received multipath signals from one of said plurality of diversity transmit antennas to form a single path processed diversity signal.

18. The system according to claim 17, further comprising at least one despreader that despreads at least a portion of said single path processed diversity signal.

19. The system according to claim 18, further comprising at least one diversity processor that combines a plurality of said despread said single path processed diversity signals, wherein each said despread said single path processed diversity signal is derived from one of said plurality of diversity transmit antennas at said base station.

20. The system according to claim 13, further comprising circuitry that combines said diversity signals transmitted by said plurality of diversity transmit antennas at said base station via at least one of a plurality of diversity modes.

21. The system according to claim 20, further comprising an antenna verifier that determines a plurality of channel weight information from at least one of:

dedicated pilot channel estimates and common pilot channel estimates.

22. The system according to claim 21, further comprising circuitry that communicates said plurality of determined channel weight information to said base station for closed loop 1 diversity mode, wherein said closed loop 1 diversity mode is one of said plurality of diversity modes.

23. The system according to claim 21, further comprising circuitry that communicates said plurality of determined channel weight information to said base station for closed loop 2 diversity mode, wherein said closed loop 2 diversity mode is one of said plurality of diversity modes.

24. The system according to claim 20, wherein said plurality of diversity modes comprise an open loop space-time transmit diversity mode.