Reducing the feedback overhead during crosstalk precoder initialization

摘要

An apparatus comprising a receiver coupled to a digital subscriber line (DSL) between an exchange site and a customer premise equipment (CPE) and configured to send a feedback error message to train a precoder coupled to the exchange site, wherein the feedback error message comprises a plurality of error components and an indication of a quantity of bits per error component, a quantization accuracy per error component, or both. Included is a method comprising sending an error feedback message to a DSL crosstalk precoder to train the crosstalk precoder, wherein the error feedback message comprises an error vector and a quantization scaling factor of the error vector.

主权项

1. An apparatus comprising:
a transceiver configured to:
receive a sync symbol comprising a plurality of tones;determine an error component for each of the plurality of tones to generate a plurality of error components, wherein each error component comprises a real error component and an imaginary error component; andsend a feedback error message to train a precoder, wherein the feedback error message comprises the plurality of error components and an indication that determines at least one of a quantity of bits per error component and a quantization accuracy per error component, wherein a maximum error feedback value of the sync symbol is calculated based at least in part on the real component and the imaginary component of the error component of each of the plurality of tones, and wherein the quantity of bits per error component and/or the quantization accuracy per error component are determined according to the maximum error feedback value.