Fast crosstalk limitation between modems

A modem and pilot sequence technology, applied in the direction of reducing crosstalk, transmission system, telephone communication, etc., can solve the problems of long training time, communication line crosstalk, unacceptable users, etc., to achieve fast response, fast processing, fast correction action Effect

Active Publication Date: 2014-06-25
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is a problem in this aspect that the communication line may suffer from crosstalk from one or more adjacent communication lines
This will result in long tr

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  • Fast crosstalk limitation between modems
  • Fast crosstalk limitation between modems
  • Fast crosstalk limitation between modems

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Embodiment Construction

[0046]In the following description, for purposes of explanation rather than limitation, specific details are set forth, such as specific architectures, interfaces, techniques, etc., in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

[0047] The present invention relates to reducing crosstalk between vectoring modems connected to a device that limits crosstalk between vectoring modems. In the following description of the different variants of the invention, the device is provided as part of a network access device. The device provides access to the Internet and any other data services like data streaming services s...

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Abstract

A device (10) for limiting crosstalk between vectoring modems connected to a group of communication lines (18, 20, 22, 24, 26, 28, 30, 32) comprises a subgroup determining element (60) that obtains information of the division into subgroups, each subgroup being made up of lines experiencing cross-talk from each other, and assigns operational pilot sequences to the group according to the division, an operational sequence transmission control element (58) that transmits the operational sequences on the lines to the modems, which sequences are mutually orthogonal to each other and each communication line receives a corresponding sequence, and a corrective action determining element (62) that obtains cross-talk measurements related to the transmitted operational pilot sequences and determines, for each subgroup, cross-talk and corrective action based on measurements made for a number of sequence symbols, which number corresponds to the minimum number required for obtaining mutually orthogonal pilot sequences within the subgroup.

Description

[0001] technical field [0002] The present invention relates to reducing crosstalk between vectoring modems connected to communication lines. More specifically, the present invention relates to methods, apparatus and computer program products for limiting crosstalk between vectoring modems connected to a set of communication lines. Background technique [0003] A modem, such as a Digital Subscriber Line (DSL) modem, is typically connected to equipment for providing access to a data communications network. Such equipment is typically a Digital Subscriber Line Access Multiplexer (DSLAM) and the communication network may be the Internet. One specific type of standard that may be of interest is Very High Speed ​​Digital Subscriber Line 2 (VDSL2). [0004] When connected in this way, the modem connects to the device through separate communication lines of pairs of conductors, usually made of copper. These lines are also often bundled in cables. This means that communication ...

Claims

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Application Information

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IPC IPC(8): H04B3/32H04B3/46H04M11/06
CPCH04B3/32H04M11/062H04B3/464H04B3/487H04L5/00
Inventor 呂晨光P-E.伊里克斯森
Owner TELEFON AB LM ERICSSON (PUBL)
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