Method and system for channel equalization

• US 20060072449A1
• Filed: 06/30/2005
• Published: 04/06/2006
• Est. Priority Date: 10/06/2004
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Inventors: Kent, Mark, Landau, Uri, Erceg, Vinko, Rooyen, Pieter van
• Application Number:
  US11/173,502
• Publication Number:
  US 20060072449A1
• Time in Patent Office: Days
• US Class Current: 370/203
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04L 25/0212 of impulse response

Abstract

Methods and systems for processing signals in a receiver are disclosed herein and may comprise generating at least one channel estimate of a time varying impulse response for at least one of a plurality of received clusters within at least one received signal, where a cluster may comprise an aggregate of continuously processed received multipaths. The generated channel estimate may be transformed to at least one flat fading channel estimate utilizing at least one signal-to-noise ratio optimization algorithm. Complex waveforms, comprising in-phase (I) and quadrature (Q) components, may be processed for the plurality of received clusters within the received signal, and the processed complex waveforms may be filtered. The resulting filtered waveforms may be convolved with the generated channel estimate to generate a convolved input signal. A weight signal for the transforming may be generated, utilizing the at least one signal-to-noise ratio optimization algorithm and the generated convolved input signal.

Claims

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

generating at least one channel estimate of a time varying impulse response for at least one of a plurality of received clusters within at least one received signal, wherein a cluster comprises an aggregate of continuously processed received multipaths; and

transforming said generated at least one channel estimate of said time varying impulse response for said at least one of said plurality of received clusters to at least one flat fading channel estimate utilizing at least one signal-to-noise ratio optimization algorithm.

2. The method according to claim 1, further comprising processing complex waveforms comprising in-phase (I) and quadrature (Q) components for said plurality of received clusters within said at least one received signal.

3. The method according to claim 2, further comprising filtering said processed complex waveforms comprising said in-phase and quadrature components.

4. The method according to claim 3, further comprising convolving said filtered processed waveforms with said generated at least one channel estimate of said time varying impulse response to generate a convolved input signal.

5. The method according to claim 4, further comprising generating at least one weight signal for said transforming utilizing said at least one signal-to-noise ratio optimization algorithm and said convolved input signal.

6. The method according to claim 1, wherein said at least one signal-to-noise ratio optimization algorithm comprises at least one of a least mean square (LMS) algorithm and a recursive least square (RLS) algorithm.

7. The method according to claim 1, further comprising convolving said at least one flat fading channel with said generated at least one channel estimate of said time varying impulse response to generate at least one received signal estimate.

8. The method according to claim 7, further comprising generating a delay signal based on a difference between said generated at least one received signal estimate and said at least one received signal.

9. The method according to claim 8, further comprising generating at least one error signal feedback utilizing said at least one received signal estimate and said generated delay signal.

10. The method according to claim 9, further comprising optimizing a signal-to-noise ratio for said at least one flat fading channel utilizing said generated at least one error signal feedback.

11. A machine-readable storage having stored thereon, a computer program having at least one code section for processing signals in a receiver, the at least one code section being executable by a machine for causing the machine to perform steps comprising:

generating at least one channel estimate of a time varying impulse response for at least one of a plurality of received clusters within at least one received signal, wherein a cluster comprises an aggregate of continuously processed received multipaths; and

transforming said generated at least one channel estimate of said time varying impulse response for said at least one of said plurality of received clusters to at least one flat fading channel estimate utilizing at least one signal-to-noise ratio optimization algorithm.

12. The machine-readable storage according to claim 11, further comprising code for processing complex waveforms comprising in-phase (I) and quadrature (Q) components for said plurality of received clusters within said at least one received signal.

13. The machine-readable storage according to claim 12, further comprising code for filtering said processed complex waveforms comprising said in-phase and quadrature components.

14. The machine-readable storage according to claim 13, further comprising code for convolving said filtered processed waveforms with said generated at least one channel estimate of said time varying impulse response to generate a convolved input signal.

15. The machine-readable storage according to claim 14, further comprising code for generating at least one weight signal for said transforming utilizing said at least one signal-to-noise ratio optimization algorithm and said convolved input signal.

16. The machine-readable storage according to claim 11, wherein said at least one signal-to-noise ratio optimization algorithm comprises at least one of a least mean square (LMS) algorithm and a recursive least square (RLS) algorithm.

17. The machine-readable storage according to claim 11, further comprising code for convolving said at least one flat fading channel with said generated at least one channel estimate of said time varying impulse response to generate at least one received signal estimate.

18. The machine-readable storage according to claim 17, further comprising code for generating a delay signal based on a difference between said generated at least one received signal estimate and said at least one received signal.

19. The machine-readable storage according to claim 18, further comprising code for generating at least one error signal feedback utilizing said at least one received signal estimate and said generated delay signal.

20. The machine-readable storage according to claim 19, further comprising code for optimizing a signal-to-noise ratio for said at least one flat fading channel utilizing said generated at least one error signal feedback.

21. A system for processing signals in a receiver, the system comprising:

a channel estimator that generates at least one channel estimate of a time varying impulse response for at least one of a plurality of received clusters within at least one received signal, wherein a cluster comprises an aggregate of continuously processed received multipaths; and

an equalizer that transforms said generated at least one channel estimate of said time varying impulse response for said at least one of said plurality of received clusters to at least one flat fading channel estimate utilizing at least one signal-to-noise ratio optimization algorithm.

22. The system according to claim 21, further comprising a filter that processes complex waveforms comprising in-phase (I) and quadrature (Q) components for said plurality of received clusters within said at least one received signal.

23. The system according to claim 22, wherein said filter filters said processed complex waveforms comprising said in-phase and quadrature components.

24. The system according to claim 23, further comprising a channel convolution processor that convolves said filtered processed waveforms with said generated at least one channel estimate of said time varying impulse response to generate a convolved input signal.

25. The system according to claim 24, further comprising a weight signal generator that generates at least one weight signal for said transforming utilizing said at least one signal-to-noise ratio optimization algorithm and said convolved input signal.

26. The system according to claim 21, wherein said at least one signal-to-noise ratio optimization algorithm comprises at least one of a least mean square (LMS) algorithm and a recursive least square (RLS) algorithm.

27. The system according to claim 21, further comprising a received signal estimator that convolves said at least one flat fading channel with said generated at least one channel estimate of said time varying impulse response to generate at least one received signal estimate.

28. The system according to claim 27, further comprising delay circuitry that generates a delay signal based on a difference between said generated at least one received signal estimate and said at least one received signal.

29. The system according to claim 28, further comprising a feedback signal generator that generates at least one error signal feedback utilizing said at least one received signal estimate and said generated delay signal.

30. The system according to claim 29, wherein said equalizer optimizes a signal-to-noise ratio for said at least one flat fading channel utilizing said generated at least one error signal feedback.