Method and system for channel estimation in a single channel MIMO system with multiple RF chains for WCDMA/HSDPA

• US 8,416,896 B2
• Filed: 12/15/2011
• Issued: 04/09/2013
• Est. Priority Date: 10/06/2004
• Status: Expired due to Fees

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kent, Mark, Erceg, Vinko, Landau, Uri M, van Rooyen, Peter
• Primary Examiner(s): Payne, David C.
• Assistant Examiner(s): Perez, James M
• Application Number:
  US13/327,027
• Publication Number:
  US 20120082257A1
• Time in Patent Office: 481 Days
• Field of Search: 342/350, 342/368, 342/377, 342/385, 342/417, 342/442, 375229-233, 375/235, 375/316, 375/322, 375/329, 375/345, 375/346, 375/349, 375/350, 455/73, 455/550.1, 455/561, 455/562.13, 455/132, 455/133, 455/136, 455/137, 455/350, 455/368, 455/377, 455/385, 455/417, 455/442
• US Class Current: 375/346
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04L 25/0204 of multiple channels

Abstract

Aspects of a method and system for channel estimation in a MIMO communication system with multiple RF chains for WCDMA/HSDPA may comprise receiving a plurality of communication signals from a plurality of transmit antennas. A plurality of vectors of baseband combined channel estimates may be generated based on phase rotation of the received plurality of communication signals. A matrix of processed baseband combined channel estimates may be generated based on the generated plurality of vectors of baseband combined channel estimates. A plurality of amplitude and phase correction signals may be generated based on the generated plurality of vectors of baseband combined channel estimates. An amplitude and a phase of at least a portion of the received plurality of communication signals may be adjusted based on the generated plurality of amplitude and phase correction signals, respectively.

Claims

1. A method for channel estimation in communication system, the method comprising:

generating a plurality of vectors of baseband combined channel estimates based on phase rotation of a received plurality of communication signals, said phase rotation being determined based on orthogonalization of channels associated with said received plurality of communication signals;

generating a plurality of amplitude correction signals based on said generated plurality of vectors of baseband combined channel estimates; and

adjusting an amplitude of a portion of said received plurality of communication signals based on a portion of said generated plurality of amplitude correction signals,

wherein at least one step of said method is performed by at least one hardware device.

2. The method according to claim 1, further comprising;

receiving said plurality of communication signals from a plurality of transmit antennas.

3. The method according to claim 1, farther comprising:

generating a matrix of processed baseband combined channel estimates based on said generated plurality of vectors of baseband combined channel estimates.

4. The method according to claim 1, further comprising:

determining a plurality of weights to be applied to each of said received plurality of communication signals based on said generated plurality of amplitude correction signals.

5. The method according to claim 4, wherein the step of adjusting comprises:

adjusting said amplitude based on said determined plurality of weights.

6. The method according to claim 4, further comprising:

calculating said determined plurality of weights by utilizing an adaptive algorithm.

7. The method according to claim 6, wherein the step of adjusting comprises:

calculating said determined plurality of weights using a least mean squares algorithm.

8. The method according to claim 1, wherein the step of generating said plurality of vectors of baseband combined channel estimates comprises:

generating said plurality of vectors of baseband combined channel estimates via rotation at additional antennas.

9. The method according to claim 1, further comprising:

modulating said received plurality of communication signals into in phase (I) components and quadrature (Q) components.

10. A method for channel estimation in a communication system, comprising:

generating a plurality of vectors of baseband combined channel estimates based on phase rotation of a received plurality of communication signals, said phase rotation being determined based on orthogonalization of channels, associated with said received plurality of communication signals;

generating a plurality of phase correction signals based on said generated plurality of vectors of baseband combined channel estimates; and

adjusting a phase of a portion of said received plurality of communication signals based on a portion of said generated plurality of phase correction signals,

wherein at least one step of said method is performed by at least one hardware device.

11. A system for channel estimation in a communication system, comprising:

one or more circuits for use in a receiver, said one or more circuits being configured to;

generate a plurality of vectors of baseband combined channel estimates based on phase rotation of a received plurality of communication signals, said phase rotation being determined based on orthogonalization of channels associated with said received plurality of communication signals;

generate a plurality of amplitude correction signals based on said generated plurality of vectors of baseband combined channel estimates; and

adjust an amplitude of a portion of said received plurality of communication signals based on a portion of said generated plurality of amplitude correction signals.

12. The system according to claim 11, wherein said one or more circuits are further configured to receive said plurality of communication signals from a plurality of transmit antennas.

13. The system according to claim 11, wherein said one or more circuits are further configured to generate a matrix of processed baseband combined channel estimates based on said generated plurality of vectors of baseband combined channel estimates.

14. The system according to claim 11, wherein said one or more circuits are further configured to determine a plurality of weights to be applied to each of said received plurality of communication signals based on said generated plurality of amplitude correction signals.

15. The system according to claim 14, wherein said one or more circuits are configured to adjust said amplitude based on said determined plurality of weights.

16. The system according to claim 14, wherein said one or more circuits are further configured to calculate said determined plurality of weights by utilizing an adaptive algorithm.

17. The system according to claim 16, wherein said adaptive algorithm is a least mean squares algorithm.

18. The system according to claim 11, wherein said one or more circuits are configured to generate said plurality of vectors of baseband combined channel estimates via rotation at additional antennas.

19. The system according to claim 11, wherein said one or more circuits are further configured to modulate said received plurality of communication signals into in phase (I) components and quadrature (Q) components.

20. The system according to claim 11, wherein said one or more circuits are further configured to adjust a phase of said portion of said received plurality of communication signals based on a portion of a generated plurality of phase correction signals, wherein said generated plurality of phase control signals are generated based on said generated plurality of vectors of baseband combined channel estimates.