Method and System for Channel Estimation Processing for Interference Suppression

• US 20130094621A1
• Filed: 12/04/2012
• Published: 04/18/2013
• Est. Priority Date: 11/09/2009
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Liu, Pan, Sutharsan, Thirunathan, LUO, Wei
• Granted Patent: US 8,681,687 B2
• Time in Patent Office: Days
• US Class Current: 375/346
• CPC Class Codes: H04B 1/7107 Subtractive interference cancellation
• CPC Class Codes: H04B 1/7115 Constructive combining of multi-path signals, i.e. RAKE receivers
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 27/00 Modulated-carrier systems

Abstract

Aspects of a method and system for channel estimation for interference suppression are provided. In this regard, one or more circuits and/or processors of a mobile communication device may generate and/or receive a first set of channel estimates and a second set of channel estimates. The one or more circuits and/or processors may modify the second set of channel estimates based on a comparison of a measure of correlation between the first set of channel estimates and the second set of channel estimates with a threshold. The first set of channel estimates and/or the modified second set of channel estimates may be utilized for cancelling interference in received signals. The first set of channel estimates may be associated with a first transmit antenna of a base transceiver station and the second set of channel estimates may be associated with a second transmit antenna of the base transceiver station.

Claims

1. A signal processing system, comprising:

a first receiver configured to generate a first set of channel estimates;

a second receiver configured to generate a second set of channel estimates; and

an interference cancellation module coupled to the first and second receivers and configured to;

determine a value of a correlation between the first set of channel estimates and the second set of channel estimates;

modify the second set of channel estimates based on the determined value of the correlation; and

cancel interference in a received signal utilizing the first set of channel estimates and the modified second set of estimates.

2. The signal processing system of claim 1, wherein the interference cancellation module is configured to determine a threshold of the value of the correlation.

3. The signal processing system of claim 2, wherein the interference cancellation module is configured to modify the second set of channel estimates by setting each estimate to zero when the value of the correlation is above the threshold.

4. The signal processing system of claim 2, wherein the interference cancellation module is configured to modify the second set of channel estimates by rotating the second set of channel estimates such that it is orthogonal to the first set of channel estimates when the value of the correlation is below the threshold.

5. The signal processing system of claim 2, wherein the threshold is determined dynamically.

6. The signal processing system of claim 1, wherein the first set of channel estimates are associated with one or more RF channels between, a first base transceiver station (BTS) and a mobile communication device.

7. The signal processing system of claim 6, further comprising a normalization module configured to normalize the first set of channel estimates with respect to total power received from the first BTS.

8. The signal processing system of claim 1, wherein the second set of channel estimates are associated with one or more RF channels between a second base transceiver station (BTS) and a mobile communication device.

9. The signal processing system of claim 8, further comprising a normalization module configured to normalize the second set of channel estimates with respect to total power received from the second BTS.

10. The signal processing system of claim 1, wherein each channel estimate in the first and second sets of channel estimates indicates a complex channel gain between a transmit antenna and one or more receive antennas.

11. A method of processing signals using a communications device, comprising:

determining a value of a correlation between a first set of channel estimates and a second set of channel estimates;

modifying the second set of channel estimates based on the determined value of the correlation; and

canceling interference in a received signal utilizing the first set of channel estimates and the modified second set of estimates.

12. The method of claim 11, further comprising determining a threshold of the value of the correlation.

13. The method of claim 12, wherein the second set of channel estimates is modified by setting each estimate to zero when the value of the correlation is above the threshold.

14. The method of claim 12, wherein the second set of channel estimates is modified by rotating the second set of channel estimates such that it is orthogonal to the first set of channel estimates when the value of the correlation is below the threshold.

15. The method of claim 12, wherein the threshold is determined dynamically.

16. The method of claim 11, wherein the first set of channel estimates are associated with one or more RF channels between a first base transceiver station (BTS) and a mobile communication device.

17. The method of claim 16, further comprising normalizing the first set of channel estimates with respect to total power received from the first BTS.

18. The method of claim 11, wherein the second set of channel estimates are associated with one or more RF channels between a second base transceiver station (BTS) and a mobile communication device.

19. The signal processing system of claim 18, normalizing the second set of channel estimates with respect to total power received from the second BTS.

20. A non-transitory computer readable medium containing computer instructions that, when executed by one or more processors, cause the one or more processors to perform actions comprising:

determining a value of a correlation between a first set of channel estimates and a second set of channel estimates;

modifying the second set of channel estimates based on the determined value of the correlation; and

canceling interference in a received signal utilizing the first set of channel estimates and the modified second set of estimates.