Techniques to converge and adapt a communication system receiver

• US 7,693,240 B2
• Filed: 03/31/2006
• Issued: 04/06/2010
• Est. Priority Date: 03/31/2006
• Status: Expired due to Fees

• Current Assignee: Intel Corporation
• Original Assignee: Intel Corporation
• Inventors: Sokolovsky, Alex, Mezer, Amir
• Primary Examiner(s): Ghayour; Mohammad H
• Assistant Examiner(s): Hassan; Sarah
• Application Number:
  US11/394,925
• Publication Number:
  US 20070237270A1
• Time in Patent Office: 1,467 Days
• Field of Search: 375/346, 375/229, 375/316
• US Class Current: 375/346
• CPC Class Codes: H04B 3/23 using a replica of transmitted signal in the time domain, e.g. echo cancellers
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04L 25/03878 Line equalisers; line build-out devices

Abstract

A system, apparatus, method and article to converge a communications system receiver are described. The apparatus may include an interference canceller to receive an interference signal and to produce an adaptive signal. The interference canceller is adapted by a first adaptation module. An equalizer is coupled to the interference canceller. The interference canceller is located before the equalizer. The equalizer receives an input signal formed of a sum of a received input signal and the adaptive signal. A slicer is coupled to the equalizer and to the interference canceller. The slicer receives an equalized version of equalizer coefficients and produces a slicer error. The first adaptation module adapts the interference canceller utilizing a convolution of the interference signal with the equalizer coefficients, and multiplying the results by the slicer error. Other embodiments are described and claimed.

Claims

1. An apparatus, comprising:

an interference canceller to receive an interference signal and to produce an adaptive signal, said interference canceller to be adapted by a first adaptation module;

an equalizer coupled to said interference canceller, said interference canceller is located before said equalizer, said equalizer to receive an input signal formed of a sum of a received input signal and said adaptive signal; and

a slicer coupled to said equalizer and to said interference canceller, said slicer to receive an equalized version of equalizer coefficients and to produce a slicer error;

wherein said first adaptation module is to adapt said interference canceller utilizing a convolution of said interference signal with said equalizer coefficients multiplying the result by said slicer error;

an adaptation selection module coupled to said slicer;

wherein said adaptation selection module is to receive information associated with a convergence status of said equalizer from said slicer and to select either said first adaptation module or a second adaptation module to adapt said interference canceller;

wherein said second adaptation module is to adapt said interference canceller at a higher signal-to-noise ratio (SNR) relative to said first adaptation module after said equalizer converges; and

wherein said adaptation transition between said first and second adaptation modules use a same set of coefficients for the interference canceller.

2. The apparatus of claim 1, wherein said second adaptation module is to adapt said interference canceller utilizing said interference signal and said equalizer input signal.

3. The apparatus of claim 1, wherein said adaptation selection module is to receive a SNR signal from said slicer, wherein said SNR indicates said convergence status of said equalizer.

4. The apparatus of claim 1, comprising:

a summer coupled between said interference canceller and said equalizer;

wherein said summer is to sum said received input signal and said adaptive signal to produce said equalizer input signal.

6. The system of claim 1, wherein said second adaptation module is to adapt said interference canceller utilizing said interference signal and said equalizer input signal.

7. The system of claim 1, wherein said adaptation selection module is to receive a SNR signal from said slicer, wherein said SNR indicates said convergence status of said equalizer.

5. A system, comprising:

an interface to couple to a communication channel physical medium; and

a receiver coupled to said interface, said receiver comprising;

an interference canceller to receive an interference signal and to produce an adaptive signal, said interference canceller to be adapted by a first adaptation module;

an equalizer coupled to said interference canceller, said interference canceller is located before said equalizer, said equalizer to receive an input signal formed of a sum of a received input signal and said adaptive signal; and

a slicer coupled to said equalizer and to said interference canceller, said slicer to receive an equalized version of equalizer coefficients and to produce a slicer error;

wherein said first adaptation module is to adapt said interference canceller utilizing a convolution of said interference signal with said equalizer coefficients, and multiplying the results by said slicer error;

an adaptation selection module coupled to said slicer;

wherein said adaptation selection module is to receive information associated with a convergence status of said equalizer from said slicer and to select either said first adaptation module or a second adaptation module to adapt said interference canceller;

wherein said second adaptation module is to adapt said interference canceller at a higher signal-to-noise ratio (SNR) relative to said first adaptation module after said equalizer converges; and

wherein said adaptation transition between said first and second adaptation modules use a same set of coefficients for the interference canceller.

8. The system of claim 5, comprising:

a summer coupled between said interference canceller and said equalizer;

wherein said summer is to sum said received input signal and said adaptive signal to produce said equalizer input signal.

9. A method, comprising:

receiving, at an interference canceller, an interference signal, an error signal, and an equalizer input signal;

adapting an interference canceller utilizing said interference signal and said equalizer input signal at an adaptation module;

wherein said adapting comprises multiplying said interference signal with said equalizer input signal;

receiving information associated with a convergence of an equalizer;

selecting either said first adaptation module or a second adaptation module to adapt said interference canceller, wherein said first and second adaptation modules use a same set of coefficients for the interference canceller; and

adapting said interference canceller utilizing a convolution of said interference signal with equalizer coefficients, and multiplying the results by said error signal.

10. The method of claim 9, comprising:

receiving a signal-to-noise ratio (SNR) signal from a slicer, wherein said SNR indicates said convergence status of said equalizer.

11. The method of claim 9, comprising:

summing said input signal and said adaptive signal; and

producing said equalizer input signal.

12. An article comprising a computer-readable storage medium containing computer executable instructions that if executed by a processor enable a system to receive an interference signal, an error signal, and an equalizer input signal;

and adapt an interference canceller utilizing said interference signal and said equalizer input signal;

wherein said adapt comprises multiplying said interference signal with said equalizer input signal, receive information associated with a convergence of an equalizer; and

select either said first adaptation module or a second adaptation module to adapt said interference canceller, wherein said first and second adaptation modules use a same set of coefficients for the interference canceller, and adapt said interference canceller utilizing a convolution of said interference signal with equalizer coefficients, and multiplying the results by said error signal.

13. The article of claim 12, comprising instructions that if executed enable the system to receive a signal-to-noise ratio (SNR) signal from a slicer, wherein said SNR indicates said convergence status of said equalizer.

14. The article of claim 12, comprising instructions that if executed enable the system to sum said input signal and said adaptive signal;

and produce said equalizer input signal.