Adaptive filter coefficient determination
AssigneeAgere Systems Inc.
InventorsAdam B. Healey, Stephen S. Oh
Life of this patent
Estimating the term…
Abstract
Operation of an adaptive filter includes determining a first filter coefficient and determining a second filter coefficient based on the first filter coefficient, in one embodiment, and in another embodiment includes comparing pseudo-error counts generated for each of several time intervals and setting filter coefficients based on the comparison. Adaptive filter coefficient generating apparatus includes a pseudo-error count generator adapted to receive the output of the adaptive filter and to generate counts of pseudo-errors occurring during successive time intervals, and a filter coefficient generator generating filter coefficients for the adaptive filter in response to the pseudo-error counts.
Claims23
A method of filtering a current input communication signal using an adaptive filter of a communications receiver the adaptive filter having a plurality of filter coefficients, the method comprising the steps of:
- (a) determining a current value for a first filter coefficient;
- (b) determining a current value for a second filter coefficient based on the current value for the first filter coefficient;
- and
- (c) filtering the current input communication signal by inputting the current input communication signal to the adaptive filter to generate a current filtered output communication signal using the current values of the first and second filter coefficients, wherein step (a) comprises the steps of:
- (a1) generating a pseudo-error count for each of several time intervals;
- (a2) comparing the pseudo-error counts with one or more count targets for several time intervals;
- and
- (a3) determining the filter coefficients in response to the comparison of step (a2).
A method of filtering a current input communication signal using an adaptive filter of a communications receiver, the method comprising the steps of:
- (a) generating a pseudo-error count for each of several time intervals, wherein the occurrence of a pseudo-error is determined when the adaptive filter output falls between two different thresholds;
- (b) comparing the pseudo-error counts with one or more count targets for several time intervals;
- (c) setting the filter coefficients in response to the comparison of step (b);
- and
- (d) filtering the input communication signal by inputting the input communication signal to the adaptive filter to generate a filtered output communication signal using the filter coefficients set in step (c).
A communications receiver comprising:
- an adaptive filter adapted to filter an input communication signal to generate a filtered output communication signal using filter coefficients;
- a pseudo-error count generator adapted to receive the filtered output communication signal of the adaptive filter and to generate counts of pseudo-errors occurring during successive time intervals, wherein the pseudo-error count generator is adapted to determine the occurrence of a pseudo-error when the filtered output communication signal falls between two different thresholds;
- and
- a filter coefficient generator adapted to generate the filter coefficients for the adaptive filter in response to the pseudo-error counts.
Dependencies are inferred from the claim text.