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US 4,815,103 AGranted
Equalizer-based timing recovery
AssigneesAmerican Telephone and Telegraph Company, AT&T Information Systems Inc.
InventorsRobert L. Cupo, Cecil W. Farrow
Life of this patent
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Abstract
In a data receiver employing a fractionally spaced equalizer, the phase with which samples of the received signal are formed is controlled in response to a signal indicative of the center of gravity of the equalizer coefficient.
Claims24
Apparatus comprising
- means for forming a succession of samples in response to a received signal,
- means for filtering said samples by summing the products of a plurality of coefficients with respective ones of said samples, and
- timing recovery means for adjusting the phase with which said samples are formed in response to a center-of-gravity signal indicative of the center of gravity of said coefficients.
Apparatus comprising
- means for forming a succession of samples in response to a received signal representing a succession of data symbols,
- means for forming a decision as to the value of each one of said symbols in response to the sum of the products of an ordered plurality of coefficients with respective ones of said samples,
- means for updating the values of said coefficients, and
- timing recovery means for adjusting the phase with which said samples are formed in response to a center-of-gravity signal indicative of the center of gravity of said coefficients.
1 more element
Apparatus comprising
- means for forming a succession of samples in response to a received signal representing a succession of data symbols,
- equalizer means for forming an equalized signal associated with an individual one of said data symbols, said equalized signal being a function of the products of a plurality of coefficients with respective ones of said samples, said coefficients having respective values associated with said one of said data symbols,
- means for forming, in response to said equalized signal, a decision as to the value of said one of said data symbols and an error signal indicative of the difference between said equalized signal and said decision,
- means for updating the values of said coefficients for use by said equalizer means in the forming of an equalized signal associated with a subsequent one of said data symbols, and
- timing recovery means for adjusting the phase of said sample forming means in response to a center-of-gravity signal indicative of the center of gravity of at least ones of said coefficients.
2 more elements
A method comprising the steps of
- forming a succession of samples in response to a received signal,
- filtering said samples by summing the products of a plurality of coefficients with respective ones of said samples, and
- adjusting the phase with which said samples are formed in response to a center-of-gravity signal indicative of the center of gravity of said coefficients.
A method comprising the steps of
- forming a succession of samples in response to a received signal representing a succession of data symbols,
- forming a decision as to the value of each one of said symbols in response to the sum of the products of an ordered plurality of coefficients with respective ones of said samples,
- updating the values of said coefficients, and
- adjusting the phase with which said samples are formed in response to a center-of-gravity signal indicative of the center of gravity of said coefficients.
1 more element
A method comprising the steps of
- forming a succession of samples in response to a received signal representing a succession of data symbols,
- forming an equalized signal associated with an individual one of said data symbols, said equalized signal being a function of the products of a plurality of coefficients with respective ones of said samples, said coefficients having respective values associated with said one of said data symbols,
- forming, in response to said equalized signal, a decision as to the value of said one of said data symbols and an error signal indicative of the difference between said equalized signal and said decision,
- updating the values of said coefficients for use in said equalized signal forming step in the forming of an equalized signal associated with a subsequent one of said data symbols, and
- adjusting the phase with which said samples are formed in response to a center-of-gravity signal indicative of the center of gravity of at least ones of said coefficients.
2 more elements
Dependencies are inferred from the claim text.