Method and apparatus for adaptively establishing a sampling phase for decision-feedback equalization
AssigneeAgere Systems Inc.
InventorPervez M. Aziz
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Abstract
Methods and apparatus are provided for adaptively establishing the optimal sampling phase offset for a DFE operation. According to one aspect of the invention, one or more values in an amplitude domain are converted into a time domain, for example, using a phase detector, based on phase information to provide said sampling phase. The values in the amplitude domain optionally comprise one or more of detected DFE data, ŷ(n) and a sign of an error term for detected DFE data. The sampling phase can establish the phase of an independent clock or an offset to a second clock, such as a clock recovered from a received signal by a clock and data recovery (CDR) circuit.
Claims16
A method for adaptively establishing a sampling phase for a decision-feedback equalization (DFE) operation, comprising:
- converting one or more values in an amplitude domain into a time domain based on phase information to provide said sampling phase, wherein said sampling phase adaptively establishes an offset to a second clock, wherein said second clock is recovered from a received signal by a clock and data recovery (CDR) circuit for a non-DFE path.
A receiver for processing data received on a channel, comprising:
- a decision-feedback equalizer for equalizing said channel;
- and
- a phase detector for converting one or more values in an amplitude domain into a time domain to adaptively establish a sampling phase for said decision-feedback equalizer, wherein said sampling phase adaptively establishes an offset to a second clock, wherein said second clock is recovered from a received signal by a clock and data recovery (CDR) circuit for a non-DFE path.
A method for adaptively establishing a sampling phase for a decision-feedback equalization (DFE) operation, comprising:
- converting one or more of detected DFE data, ŷ(n), and a sign of an error term for detected DFE data in an amplitude domain into a time domain based on phase information to provide said sampling phase, wherein said sampling phase adaptively establishes an offset to a second clock, wherein said second clock is recovered from a received signal by a clock and data recovery (CDR) circuit for a non-DFE path.
Dependencies are inferred from the claim text.