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US 12,081,373 B1Granted
Decision feedback equalization for electro-magnetic interference cancellation in received signal
AssigneeEthernovia Inc.
InventorHossein Sedarat
Life of this patent
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Abstract
Various embodiments described herein provide for data communications using decision feedback equalization (DFE) for electro-magnetic interference (EMI) cancellation in a received signal, such as a signal received over a data communication medium and at a receiver of a communication system. In particular, some embodiments use a DFE and a feed-forward equalizer (FFE) to equalize a signal received by a first physical layer device from a second physical layer device over a data communication medium, and to operate as a narrowband notch filter to cancel EMI from the received signal.
Claims18
A physical layer device comprising:
- a fractionally-spaced equalizer configured to generate a first equalized signal based on an input analog signal, the physical layer device being a first physical layer device, the input analog signal being based on a data signal transmitted from a second physical layer device to the first physical layer device over a data communication medium, the fractionally-spaced equalizer comprising:
- a first analog-to-digital converter configured to generate a first digital signal based on the input analog signal and a first clock signal;
- a first feed-forward equalizer configured to generate a second equalized signal based on the first digital signal;
- a second analog-to-digital converter configured to generate a second digital signal based on the input analog signal and a second clock signal, the second clock signal being out of phase with the first clock signal;
- a second feed-forward equalizer configured to generate a third equalized signal based on the second digital signal;
- and
- a first combiner configured to generate the first equalized signal by combining the second equalized signal and the third equalized signal;
- a second combiner configured to generate a narrowband-cancelled signal by combining the first equalized signal and a fourth equalized signal, the narrowband-cancelled signal representing the first digital signal after electro-magnetic interference cancellation;
- a data slicer configured to generate a sample signal by sampling the narrowband-cancelled signal;
- and
- a decision feedback equalizer configured to generate the fourth equalized signal based on the sample signal.
8 more elements
A method comprising:
- generating, by a fractionally-spaced equalizer of a first physical layer device, a first equalized signal based on an input analog signal, the input analog signal being based on a data signal transmitted from a second physical layer device to the first physical layer device over a data communication medium, the fractionally-spaced equalizer comprising:
- a first analog-to-digital converter configured to generate a first digital signal based on the input analog signal and a first clock signal;
- a first feed-forward equalizer configured to generate a second equalized signal based on the first digital signal;
- a second analog-to-digital converter configured to generate a second digital signal based on the input analog signal and a second clock signal, the second clock signal being out of phase with the first clock signal;
- a second feed-forward equalizer configured to generate a third equalized signal based on the second digital signal;
- and
- a first combiner configured to generate the first equalized signal by combining the second equalized signal and the third equalized signal;
- generating, by a second combiner of the first physical layer device, a narrowband-cancelled signal by combining the first equalized signal and a fourth equalized signal, the narrowband-cancelled signal representing the first digital signal after electro-magnetic interference cancellation;
- generating, by a data slicer of the first physical layer device, a sample signal by sampling the narrowband-cancelled signal;
- and
- generating, by a decision feedback equalizer of the first physical layer device, the fourth equalized signal based on the sample signal.
8 more elements
Dependencies are inferred from the claim text.