Method for determining the step size for an lms adaptive equalizer for 8vsb
AssigneeTechwell, Inc.
InventorsMark Fimoff, Jin Kim, Gregory J. Tomezak
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Abstract
A method and system for determining a step size of an adaptive equalizer for a digital data receiver. The data received by the receiver includes coded symbols and uncoded symbols. The method includes determining a first error estimate based on decoded symbols corresponding to the coded symbols, determining a second error estimate based on the uncoded symbols, adaptively selecting the first error estimate or the second error estimate based on a convergence criterion, and determining a step size based on the selected error estimate.
Claims32
A method of determining a step size of an adaptive equalizer for a digital data receiver, data received by the receiver including coded symbols and uncoded symbols, the method comprising:
- determining a first error estimate based on decoded symbols corresponding to the coded symbols;
- determining a second error estimate based on the uncoded symbols;
- adaptively selecting one of the first error estimate and the second error estimate based on a convergence criterion;
- and
- determining a step size based on the selected error estimate.
A method of determining a step size of an adaptive equalizer for a digital data receiver, data received by the receiver including coded symbols and uncoded symbols, the method comprising:
- based on a convergence criterion, selecting one of a first signal estimation process and a second signal estimation process, the first signal estimation process utilizing decoded symbols corresponding to the coded symbols, and the second signal estimation process utilizing the uncoded symbols;
- determining a signal estimate based on the selected signal estimation process;
- determining an error estimate based on the received data and the signal estimate;
- and
- determining a step size based on the error estimate.
An adaptive equalizer for a digital data receiver, data received by the receiver including coded symbols and uncoded symbols, the equalizer comprising:
- a selection module configured to select, based on a convergence criterion, one of decoded symbols and the uncoded symbols, the decoded symbols corresponding to the coded symbols;
- an error estimator configured to compare the received data and the selected symbols, and to generate an error estimate based on the comparison;
- and
- a step size generator configured to generate a step size based on the error estimate.
A device configured to process digital television signals, the device comprising:
- a receiver including a demodulator, a decoder, a slicer, and an equalizer,
- the receiver configured to receive radio frequency signals modulated with data including coded symbols and uncoded symbols,
- the demodulator configured to demodulate the received radio frequency signals to produce the coded symbols and the uncoded symbols,
- the decoder configured to decode the coded symbols to produce corresponding decoded symbols,
- the slicer configured to slice the uncoded symbols to produce corresponding sliced symbols, and
- the equalizer including
- a selection module configured to select, based on a convergence criterion, one of the decoded symbols and the sliced symbols,
- an error estimator configured to compare the data and the selected symbols, and to generate an error estimate based on the comparison, and
- a step size generator configured to generate a step size based on the error estimate.
A method of determining a step size for a linear-mean-squared (LMS) equalizer of 8-level-vestigial-sideband (8VSB) modulated signals having trellis-coded symbols and segment sync symbols, the method comprising:
- (a) decoding the trellis-coded symbols;
- (b) determining a first mean-squared-error estimate based on the decoded trellis-coded symbols;
- (c) slicing the segment sync symbols;
- (d) determining a second mean-squared-error estimate based on the sliced segment sync symbols;
- (e) adaptively selecting one of the first mean-squared-error estimate and the second mean-squared-error estimate based on a convergence criterion;
- (f) determining a step size based on the selected error estimate;
- and
- (g) iteratively performing acts (a)-(f).
A digital communication receiver configured to receive radio frequency signals modulated with data including coded symbols and a priori known uncoded symbols, the receiver comprising:
- a demodulator configured to demodulate the received radio frequency signals to produce the coded symbols and the a priori known uncoded symbols;
- a decoder configured to decode the coded symbols to produce corresponding decoded symbols;
- and
- an equalizer including
- a selection module configured to select, based on a convergence criterion, one of the decoded symbols and the a priori known uncoded symbols,
- an error estimator configured to compare the data and the selected symbols, and to generate an error estimate based on the comparison, and
- a step size generator configured to generate a step size based on the error estimate.
Dependencies are inferred from the claim text.