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US 7,688,888 B2Granted
CIR estimating decision feedback equalizer with phase tracker
AssigneeZenith Electronics Corporation
InventorsTyler Brown, Mark Fimoff, Sreenivasa M. Nerayanuru, Gregory Tomezak
Life of this patent
Estimating the term…
Abstract
An output of an equalizer is decoded to produce first decoded data having a first accuracy. The output of the equalizer is further decoded to produce second decoded data having a second accuracy, and the second accuracy is greater than the first accuracy. Tap weights for the equalizer are calculated using the first and second decoded data. The calculated tap weights are applied to the taps of the equalizer.
Claims39
A method of operating an equalizer having taps comprising:
- equalizing received symbols by use of the equalizer to produce equalized symbols;
- applying a correction to the equalized symbols to produce corrected symbols characterized by a processing delay d;
- decoding the equalized symbols to provide first symbol decisions;
- decoding the corrected symbols to provide second symbol decisions;
- calculating tap weights for the equalizer in response to received symbols and in response to a number of the first symbol decisions covering a time span b and in response to a number of the second symbol decisions covering a time span b′, wherein the time span b substantially equals the processing delay d;
- and,
- applying the calculated tap weights to the equalizer.
4 more elements
A system comprising:
- an equalizer having taps with tap weights;
- a signal corrector that produces a corrected output based on an output of the equalizer, wherein the corrected output is characterized by a delay d;
- a first decoder that decodes the output of the equalizer to recover first decoded data;
- a second decoder that decodes the corrected output to recover second decoded data;
- and,
- a tap weight calculator that calculates and applies the tap weights to the equalizer based upon a channel impulse response determined from a received signal, from an amount of the first decoded data covering a time span b, and from an amount of the second decoded data covering a time span b′, wherein the time span b is substantially equal to the delay d.
3 more elements
A method of operating an equalizer having taps comprising:
- decoding an equalized output of the equalizer to produce first decoded data having a first accuracy;
- applying phase tracking to the equalized output of the equalizer to produce a phase tracked output;
- decoding the phase tracked output to produce second decoded data having a second accuracy, wherein the second accuracy is greater than the first accuracy;
- calculating tap weights for the equalizer using the first and second decoded data;
- and,
- applying the calculated tap weights to the taps of the equalizer.
3 more elements
Dependencies are inferred from the claim text.