Method and system for automatic control in an interference cancellation device

• US 7,725,079 B2
• Filed: 06/09/2006
• Issued: 05/25/2010
• Est. Priority Date: 12/14/2004
• Status: Expired due to Fees

• Current Assignee: Intersil Americas LLC (Renesas Electronics Corporation)
• Original Assignee: Quellan, Inc. (Renesas Electronics Corporation)
• Inventors: Stelliga, David Anthony, Farrell, Michael F., Dickmann, Mark W., Schmukler, Bruce C., Summers, Charles E., Vrazel, Michael G., Laskar, Joy, Kim, Andrew Joo, Gebara, Edward
• Primary Examiner(s): PHAM, TUAN
• Application Number:
  US11/450,543
• Publication Number:
  US 20070060059A1
• Time in Patent Office: 1,446 Days
• Field of Search: 455/63.1, 455/570, 455/114.2, 455/222, 455/226.3, 455/278.1, 455/296
• US Class Current: 455/63.1
• CPC Class Codes: H04B 1/123 using adaptive balancing or compensation means adaptive filter circuits and algorithms H03H
• CPC Class Codes: H04B 1/7103 the interference being multiple access interference

Abstract

Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.

Claims

1. A method for reducing interference that a first communication signal induces on a second communication signal via an effect, comprising the steps of:

obtaining a sample of the first communication signal;

producing an interference compensation signal in response to processing the obtained sample with a model of the effect, the model comprising a signal processing parameter;

reducing the interference to a level in response to applying the interference compensation signal to the second communication signal;

changing the reduced level of the interference in response to perturbing the signal processing parameter;

performing an assessment of the change; and

refining the signal processing parameter according to the assessment;

wherein the step of refining the signal processing parameter further comprises processing a second sample of the second communication signal with a circuit that comprises a first electrical component and a second electrical component, and

wherein the method further comprises the steps of;

removing power from the first electrical component in response to an occurrence of an event; and

operating the circuit with power removed from the first electrical component while power feeds the second electrical component.

2. The method of claim 1, wherein performing the assessment of the change comprises determining whether to increase or to decrease the signal processing parameter.

3. The method of claim 2, wherein refining the signal processing parameter comprises increasing or decreasing the signal processing parameter according to the determination.

4. The method of claim 1, wherein refining the signal processing parameter comprises performing a gradient optimization of the signal processing parameter.

5. The method of claim 1, wherein performing the assessment of the change comprises monitoring for noise on a channel that carries the second communication signal, and wherein the effect comprises an interference effect.

6. The method of claim 1, wherein the signal processing parameter comprises a gain, and wherein refining the signal processing parameter comprises adjusting the gain.

7. The method of claim 1, wherein the signal processing parameter comprises a phase, and wherein refining the signal processing parameter comprises adjusting the phase.

8. The method of claim 1, wherein refining the signal processing parameter comprises refining the model to track a change in the effect.

9. The method of claim 1, wherein the effect comprises an interference effect, and wherein refining the signal processing parameter comprises compensating for a change in the interference effect associated with an operating environmental fluctuation.

10. The method of claim 1, wherein the first electrical component comprises a comparator and wherein the second electrical component comprises a memory register that stores a representation of the signal processing parameter.

11. The method of claim 1, wherein the first electrical component comprises a power detector and wherein the second electrical component comprises a memory element containing a number corresponding to the signal processing parameter.