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US 5,333,149 AGranted
Process and a circuit for adapting coefficients in a modem equalizer
AssigneeSGS-Thomson Microelectronics S.A.
InventorsDominique Vicard, William Glass, Francois Druilhe
Life of this patent
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Abstract
A process and a circuit for carrying out the process for adapting coefficients in a modem equalizer comprises a memory cell for storing a coefficient, an adapter receiving the output of the cell and providing a first signal having a first correction, and an adder receiving the first signal and providing a second signal to the cell. The adder also receives a value k much smaller than 1 having the sign provided by a comparator comparing an initial value of the considered coefficient and its current value.
Claims29
A method for adapting coefficients in a modem equalizer, comprising the steps of:
- periodically storing a coefficient value;
- periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value;
- and
- periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
1 more element
An adapter circuit for adapting coefficients in a modem equalizer, comprising:
- first means for periodically storing a coefficient value;
- means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at lest one symbol provided to the modem to produce a first corrected coefficient value;
- and
- means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
1 more element
A modem including a modem equalizer for adapting coefficients, comprising:
- a first memory for storing a coefficient;
- an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value;
- and
- an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, much smaller than unity, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
1 more element
A method for adapting coefficients in a modem equalizer, comprising the steps of:
- periodically storing a coefficient value;
- periodically correcting the stored coefficient value using an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value;
- and
- periodically correcting the first corrected coefficient value to produce a second corrected coefficient value by adding to the first corrected coefficient value a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
1 more element
An adapter circuit for adapting coefficients in a modem equalizer, comprising:
- first means for periodically storing a coefficient value;
- means, coupled to the first means, for periodically correcting the stored coefficient value including means for processing an error signal associated with detection of at least one symbol provided to the modem to produce a first corrected coefficient value;
- and
- means, coupled to the first means, for periodically correcting the first corrected coefficient value to produce a second corrected coefficient value to be stored in the first means, including means for adding to the first corrected coefficient value, a recall signal comprising a product of an additive constant and a sign of a difference between the first corrected coefficient value and an initial coefficient value.
1 more element
A modem including a modem equalizer for adapting coefficients, comprising:
- a first memory for storing a coefficient;
- an adapter circuit having a first input coupled to the first memory for receiving the coefficient value stored therein, a second input for receiving a data signal, a third input for receiving an error signal, and an output providing a first corrected coefficient value;
- and
- an adder circuit having a first input coupled to the adapter circuit for receiving the first corrected coefficient value, a second input for receiving a recall signal, the recall signal comprising a product of an additive constant, and a sign of a difference between the first corrected coefficient value provided by the adapter circuit and an initial coefficient value, and an output, coupled to the first memory, providing a second corrected coefficient value that is the sum of the signals at the first and second inputs.
1 more element
Dependencies are inferred from the claim text.