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US 7,738,546 B2Granted
Feed forward equalizer for a communication system
AssigneeIntel Corporation
InventorBenny Christensen
Life of this patent
Estimating the term…
Abstract
A method and apparatus for a feed forward equalizer for a communication system are described. An equalizer comprising a tapped filter having multiple filter multipliers and a summing element is described. The equalizer further comprises a correlator having multiple correlator multipliers, with each correlator multiplier having a corresponding integrator, a set of shared delay elements to connect to the filter multipliers and the correlator multipliers; and an error signal generator to connect to the correlator.
Claims37
An equalizer, comprising:
- a tapped filter having multiple filter multipliers and a summing element;
- a correlator having multiple correlator multipliers, with each correlator multiplier having a corresponding integrator;
- a set of shared delay elements to connect to said filter multipliers and said correlator multipliers, with each delay element to include multiple delay stages, with a first delay stage to receive an input data signal and output a first delay signal to one of said correlator multipliers and none of said filter multipliers, and a second delay stage to receive said first delay signal and output a second delay signal to one of said filter multipliers and none of said correlator multipliers;
- and
- an error signal generator to connect to said correlator, said error signal generator comprising a slicer and a subtraction node, said slicer to receive as input a linear input signal from said summing element and output a sliced signal, the subtraction node to subtract said sliced signal from said linear input signal to form an error signal for output to said correlator.
2 more elements
A system, comprising:
- a communications medium;
- a transceiver to connect to said communications medium, said transceiver to include a feed-forward equalizer to receive an input data signal and output an equalized signal, said feed-forward equalizer to comprise:
- a tapped filter having multiple filter multipliers and a summing element;
- a correlator having multiple correlator multipliers, with each correlator multiplier having a corresponding integrator;
- a set of shared delay elements to connect to said filter multipliers and said correlator multipliers, with each delay element to include multiple delay stages, with a first delay stage to receive an input data signal and output a first delay signal to one of said correlator multipliers and none of said filter multipliers, and a second delay stage to receive said first delay signal and output a second delay signal to one of said filter multipliers and none of said correlator multipliers;
- and
- an error signal generator to connect to said correlator, said error signal generator comprising a slicer and a subtraction node, said slicer to receive as input a linear input signal from said summing element and output a sliced signal, the subtraction node to subtract said sliced signal from said linear input signal to form an error signal for output to said correlator.
4 more elements
A feed forward equalizer, comprising:
- a filter having multiple filter multipliers and a summing element;
- a correlator having multiple correlator multipliers, with each correlator multiplier having a corresponding integrator, each integrator comprises a linear stage and a set of three current mirrors to connect to said linear stage;
- a set of shared delay elements to connect to said filter multipliers and said correlator multipliers, with each delay element to include multiple delay stages, with a first delay stage to receive an input data signal and output a first delay signal to only one of said correlator multipliers and a second delay stage, and a second delay stage to receive said first delay signal and output a second delay signal to only one of said filter multipliers and another delay element;
- and
- an error signal generator to connect to said correlator, said error signal generator comprising a slicer and a subtraction node, said slicer to receive as input a linear input signal from said summing element and output a sliced signal, the subtraction node to subtract said sliced signal from said linear input signal to form an error signal for output to said correlator.
2 more elements
Dependencies are inferred from the claim text.