Device and associated method for crosstalk estimation

Abstract

The present invention relates to a crosstalk estimation device for estimating crosstalk between communication lines in a precoding group. The crosstalk estimation device comprises transmission means for transmitting a pilot sequence and reception means for receiving error feedback on one or more communication lines in the precoding group. The crosstalk estimation device further comprises crosstalk estimation means for combining the pilot sequence with the error feedback in order to obtain a crosstalk estimation between the communication lines. The device further comprises selection means for selecting a subset of one or more communication lines from the precoding group. The transmission means are adapted to transmit the pilot sequence only on the subset.

Description

technical field [0001] The present invention generally relates to precoding of communication lines, and particularly relates to a device and method for estimating crosstalk information, which can be used for precoding of communication lines, such as very high-speed digital subscriber line (VDSL) and VDSL2 lines. Background technique [0002] Various communication lines operating adjacent to each other may induce signals between each other. For example, two communication lines (such as VDSL2) adjacent to each other induce a signal in each other's lines. This signal is called crosstalk and affects the quality of communication on these lines. Due to this induced crosstalk and noise from other sources in the communication line environment, data sent over these lines may be affected or corrupted by the crosstalk and noise. Corrupted data needs to be corrected or resent before the receiver can process the data. By reducing or compensating for crosstalk induced in the communicat...

AI Technical Summary

Problems solved by technology

Existing solutions invest equal time and computation in determining strong and weak crosstalkers, and often provide a complete estimate of all crosstalk coefficients, which may waste computational power and time since information from only strong crosstalkers may be sufficient to use to perform precoding in the precoding group

[0013] The third disadvantage is that when the join line is initialized, the crosstalk of the communication line needs to be estimated, especially the influence of this line on other lines in the precoding group is particularly important

This means that sending pilot sequences on legacy lines may conflict with standard specifications

Furthermore, legacy lines are generally not capable of communicating errors measured on sync symbols to the DSLAM

As a result, existing systems have difficulty obtaining crosstalk information in precoding groups that include both legacy lines and vector-enabled lines

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