| US 7,542,531 B2 | ||
| Digital cancellation of radio frequency interference | ||
| Chia-Liang Lin, Union City, Calif. (US); and Pei-Chieh Hsiao, Hsinchu (Taiwan) | ||
| Assigned to Realtek Semiconductor Corp., (Taiwan) | ||
| Filed on Aug. 04, 2005, as Appl. No. 11/196,914. | ||
| Claims priority of provisional application 60/594265, filed on Mar. 24, 2005. | ||
| Prior Publication US 2006/0215775 A1, Sep. 28, 2006 | ||
| Int. Cl. H03D 1/04 (2006.01) | ||
| U.S. Cl. 375—346 [375/316; 375/295; 375/219; 370/210; 329/318; 329/349; 708/400] | 20 Claims |
| 1. A method of estimating a spectral component of interference at a particular frequency, comprising:
selecting a frequency of interest from a first plurality of frequencies in a frequency band;
generating the frequency domain data for the first plurality of frequencies;
determining whether there is interference at any one of the first plurality of frequencies;
determining the peak output of the frequency domain data at a location in the frequency band where the interference spectral
components dominate;
selecting the frequency domain data from a second plurality of frequencies near the spectral peak of the interference among
the first plurality of frequencies;
obtaining a first set of coefficients using linear combinations of the frequency domain data of the second plurality of frequencies
using a second set of coefficients that are pre-computed and stored in a look-up table; and
quantifying the interference component using an interface canceller at at the frequency of interest using a Taylor series
on the reciprocal of the spectral distance between the frequency of interest and the spectral peak of the interference using
the first set of coefficients, wherein the Taylor series estimates the spectral components of the interference generally in
the form of 1/(m-½), where m is an integer and (m-½) is a normalized approximate distance between a frequency of interest
and the center frequency of the interference.
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