Activating method for newly adding line pair into xdsl system,apparatus thereof and xdsl system

A newly added, line-pair technology, applied in the field of communication, can solve the problems of inability to open, reduce the channel rate, and low line rate, and achieve the effect of reducing the scale, reducing the activation time, and reducing the time of the crosstalk cancellation coefficient

Inactive Publication Date: 2011-10-19
中祥泰富商业管理(广州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the sub-carriers used by xDSL are getting wider and wider, far-end crosstalk (FEXT) is increasingly affecting the transmission performance of the line.
In xDSL transmission, crosstalk is reflected as part of the noise, so severe far-end crosstalk significantly reduces the channel rate
When multiple users in a bundle of cables request to activate xDSL services, the rate of some lines will be low, the performance will be unstable, or even unavailable due to far-end crosstalk (FEXT), which will eventually lead to a relatively low outgoing line rate of the DSLAM.

Method used

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  • Activating method for newly adding line pair into xdsl system,apparatus thereof and xdsl system
  • Activating method for newly adding line pair into xdsl system,apparatus thereof and xdsl system
  • Activating method for newly adding line pair into xdsl system,apparatus thereof and xdsl system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for activating a newly added line pair in an xDSL system, such as figure 1 As shown, the method includes:

[0038] 101. The DSLAM (DSL access multiplexer) constructs an initial pilot sequence according to the crosstalk cancellation coefficient between the wire pairs currently in the data transmission phase and the number of newly added wire pairs.

[0039] 102. The DSLAM estimates, according to the initial pilot sequence, the crosstalk cancellation coefficient of the newly added line pair that is in the data transmission phase.

[0040] 103. The DSLAM constructs an augmented pilot sequence on the basis of the initial pilot sequence according to the crosstalk cancellation coefficient of the newly added line pair in the data transmission phase.

[0041] 104. According to the augmented pilot sequence, the DSLAM estimates the crosstalk cancellation coefficient of the newly added line pair of the line pair in the data transmission stage.

...

Embodiment 2

[0045] This embodiment provides a method for activating a newly added line pair in an xDSL system. In this embodiment, in the Vectored-DSL system, by analyzing the crosstalk cancellation coefficient between the line pairs currently in the data transmission stage, all current In the stage of data transmission, the relationship between the strength and weakness of the crosstalk between the line pairs. Through the strength relationship, the line pairs in the data transmission stage can be explicitly or implicitly merged into multiple groups, that is, the crosstalk between the line pairs in the group is seriously affected, and any two pairs are not in the same group The influence of crosstalk between the lines is weak or almost non-existent.

[0046] On the other hand, through the configuration of the Vectored-DSL management system, it is also possible to configure the line pairs currently in the data transmission stage, and explicitly or implicitly merge all or part of the line p...

Embodiment 3

[0148] This embodiment provides an activation method for a newly added line pair in an xDSL system. The difference from Embodiment 2 is that in this embodiment, the pilot sequence used in step 201 in Example 2 and the new matrix used in step 204 Q is optimized. A special power-of-two Walsh matrix (a special case of the Hadamard matrix) is used for allocating pilot sequences and as Q.

[0149] Wherein, the Walsh matrix is ​​constructed as follows:

[0150] W 1 =(1)

[0151] W 2 = 1 1 1 - 1 ,

[0152] W 2 k = W 2 k - ...

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PUM

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Abstract

The embodiment of the invention discloses an activating method for newly adding line pairs into an XDSL system and an apparatus thereof. The method includes: constructing an initial pilot frequency sequence, according to crosstalk offset coefficients between the line pairs in the process of data transmission and the number of the newly added line pairs; estimating the crosstalk offset coefficients of the newly added line pairs on the line pairs in the process of data transmission, according to the initial pilot frequency sequence; constructing an augmentation pilot frequency sequence on the basis of the initial pilot frequency sequence, according to the crosstalk offset coefficients of the newly added line pairs on the line pairs in the process of data transmission; estimating crosstalk offset coefficients of the line pairs in the process of data transmission on the newly added line pairs, according to the augmentation pilot frequency sequence; and activating the newly added line pairs to be on lines and proceeding to the data transmission stage. The method and the apparatus of the invention is suitable for activating the newly added line pairs in the XDSL system to be on the lines.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and device for activating a newly added line pair in an xDSL system, and the xDSL system. Background technique [0002] xDSL is a general term for various types of DSL (Digital Subscribe Line, Digital Subscriber Line), and xDSL is a high-speed data transmission technology transmitted over telephone twisted-pair wires. In addition to DSL with baseband transmission such as IDSL (ISDN-based digital subscriber line) and SHDSL (single-pair high-speed digital subscriber line), xDSL with passband transmission uses frequency division multiplexing technology to make xDSL and traditional telephone service (POTS) coexist in On the same pair of twisted pairs, xDSL occupies high subcarriers, POTS occupies the baseband part below 4KHz, and POTS signals are separated from xDSL signals through a splitter. A device that provides multiplexDSL access is called a DSL access multiple...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04B3/32
CPCH04B3/32H04L27/2613H04L27/26136
Inventor 王祥刘立贺李程
Owner 中祥泰富商业管理(广州)有限公司
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