Device and associated method for crosstalk estimation

一种设备、反馈相的技术，应用在估计串扰信息领域，能够解决难以获得串扰信息、不能同步符号测量的差错传送DSLAM、浪费计算功率和时间等问题

Active Publication Date: 2010-02-10
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Device and associated method for crosstalk estimation
  • Device and associated method for crosstalk estimation
  • Device and associated method for crosstalk estimation

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0074] figure 1 A DSLAM 101 is shown connected to several CPE devices 102 1 to 102 n . CPE102 1 to CPE 102 n Via respective VDSL2 lines 103 1 to 103 n interconnected. In this particular instance, line 103 1 to 103 n all form part of the same precoding group, and the precoding group in this example is restricted to line 103 1 to 103 n .

[0075] In this particular embodiment, DSLAM 101 has a crosstalk estimation device according to the invention. DSLAM 101 is thus able to define pilot sequences, slave lines 103 1 to 103 n select a subset, transmit a pilot sequence on each selected line in the subset, and receive a pilot sequence from the CPE 102 1 to 102 n error feedback. The crosstalk estimation device in the DSLAM 101 can thus be used to determine crosstalk channel coefficients representing the crosstalk channel between the lines in the precoding group. For this example, consider line 103 1 to 103 3 is the vector enable line while line 103 4 and 103 5 It's ...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04B3/32
CPCH04B3/32H04L27/261H04L25/0206H04B3/464H04L1/20H04B3/487H04L25/0204H04B3/46
Inventor C·J·努兹曼A·J·德林德万韦恩加登P·A·怀廷J·J·M·马斯G·G·T·克雷默H·乔A·E·阿希赫明
Owner ALCATEL LUCENT SAS
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