Method for Robust Crosstalk Precoder Training in Channels with Impulse Noise
First Claim
1. An apparatus comprising:
- a first transceiver at a central office (CO) coupled to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL);
a crosstalk precoder coupled to the first transceiver at the CO; and
a vectoring control entity (VCE) coupled to the first transceiver via a feedback channel and to the crosstalk precoder,wherein the second transceiver comprises a noise monitor configured to detect non-crosstalk noise in a downstream signal from the CO to the CPE, andwherein the first transceiver is configured to receive a predefined special feedback signal from the second transceiver that indicates whether non-crosstalk noise is detected in the downstream signal instead of a measured error value.
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Abstract
An apparatus comprising a first transceiver at a central office (CO) coupled to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL), a crosstalk precoder coupled to the first transceiver at the CO, and a vectoring control entity (VCE) coupled to the transceiver via a feedback channel and to the crosstalk precoder, wherein the second transceiver comprises a noise monitor configured to detect non-crosstalk noise in a downstream signal from the CO to the CPE, and wherein the first transceiver is configured to receive a predefined special feedback signal from the second transceiver that indicates whether non-crosstalk noise is detected in the downstream signal instead of a measured error value.
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Citations
20 Claims
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1. An apparatus comprising:
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a first transceiver at a central office (CO) coupled to a second transceiver at a customer premise equipment (CPE) via a digital subscriber line (DSL); a crosstalk precoder coupled to the first transceiver at the CO; and a vectoring control entity (VCE) coupled to the first transceiver via a feedback channel and to the crosstalk precoder, wherein the second transceiver comprises a noise monitor configured to detect non-crosstalk noise in a downstream signal from the CO to the CPE, and wherein the first transceiver is configured to receive a predefined special feedback signal from the second transceiver that indicates whether non-crosstalk noise is detected in the downstream signal instead of a measured error value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A network component comprising:
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at least one processor coupled to a memory and configured to; receive a downstream digital subscriber line (DSL) signal from a central office (CO); detect whether the downstream DSL signal is corrupted by non-crosstalk noise; send an error feedback signal to the CO that indicates a measured error due to crosstalk noise in the downstream DSL signal if the downstream DSL signal is not substantially corrupted by non-crosstalk noise; and send an error feedback signal to the CO that indicates that non-crosstalk noise has been detected instead of the measured error in the downstream DSL signal if the downstream DSL signal is substantially significantly corrupted by non-crosstalk noise. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A method comprising:
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obtaining an error sample for a tone in a received symbol from a central office (CO); detecting that the tone is corrupted if the error sample is corrupted due to impulse noise or clipping or is otherwise unreliable; and sending an error vector that comprises a special predefined value for the error sample to a vectoring control entity (VCE) coupled to a crosstalk precoder to indicate to the VCE that the error sample and the tone are corrupted, wherein the special value for the error sample comprises a real component and an imaginary component that each comprise the same quantity of bits Lw, and wherein all the bits in the real component and in the imaginary component are equal to one. - View Dependent Claims (19, 20)
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Specification