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A method, device and system for crosstalk channel estimation

A channel estimation and channel technology, applied in the network field, can solve problems such as the long process of activating and going online for a newly activated line pair, and the long time of crosstalk channel

Active Publication Date: 2015-11-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Based on the existing Vectored-DSL technology, the length of the pilot sequence is at least the total number of newly activated line pairs and online line pairs in the system, and when the number of newly activated line pairs and online line pairs in the system is large, then The estimation process of the crosstalk channel will take a long time, and the process of activating and going online of the newly activated line pair needs to estimate the crosstalk channel and calculate the crosstalk cancellation coefficient multiple times, so it will also lead to the activation of the newly activated line pair. The activation process is very long

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  • A method, device and system for crosstalk channel estimation
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  • A method, device and system for crosstalk channel estimation

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Embodiment 1

[0094] The embodiment of the present invention provides a method for estimating a crosstalk channel. The method preliminarily groups the non-idle line pairs in the system according to the crosstalk influence data determined in the previous crosstalk channel estimation process, and the crosstalk between the line pairs of different groups The affected data is less than the set first threshold value, refer to figure 1 , the processing flow of this method may include the following steps:

[0095] Step 101, acquire the number of wire pairs in each group under the current group.

[0096] Step 102, assign pilot sequences to each group according to the number of line pairs in each group, and there are at least one pair of non-orthogonal pilot sequences among different groups.

[0097] Step 103, using the pilot sequence allocated for each group, to estimate the crosstalk channel of each group.

[0098] In the embodiment of the present invention, the non-idle line pairs in the system ...

Embodiment 2

[0100] An embodiment of the present invention provides a method for estimating a crosstalk channel, which can be controlled and executed by a DSLAM on the network side, wherein after the pilot sequence is determined, the subsequent crosstalk channel estimation process can be performed with the participation of a terminal. In this method, the non-idle line pairs in the system can be grouped in advance according to the crosstalk impact data determined in the previous crosstalk channel estimation process, and the crosstalk impact data between line pairs in different groups is less than the set first threshold value. The crosstalk effect data is data used to represent the strength of the crosstalk between each line pair. The crosstalk effect data between the line pairs can be the absolute value of the crosstalk cancellation coefficient between the line pairs, or the absolute value of the crosstalk cancellation coefficient multiplied by with preset coefficients. Here, the first th...

Embodiment 3

[0142]An embodiment of the present invention provides a method for estimating a crosstalk channel. The method for estimating a channel for crosstalk provided by an embodiment of the present invention will be further described below in conjunction with the process of line initialization. In the process of line initialization, there are already online pairs in the system. The specific processing flow see figure 2 , including the following steps:

[0143] In step 201, the DSLAM receives the access request sent by the terminal, and performs a handshake process with the terminal.

[0144] Step 202, the DSLAM estimates the downlink crosstalk channel of the newly activated line pair to the already online line pair in the system (corresponding to the O-P-VECTOR1 stage), and estimates the uplink crosstalk channel of the newly activated line pair in the system to the already online line pair (corresponding to the R-P-VECTOR1 stage) stage).

[0145] In this step, non-idle line pairs m...

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Abstract

Disclosed are a crosstalk channel estimation method, device and system, which belong to the field of network technology. The method comprises: according to the crosstalk influence data determined in a previous crosstalk channel estimation process, grouping non-idle wire pairs in a system, the crosstalk influence data among the wire pairs of different groups being less than a set first threshold value; acquiring the number of wire pairs in each group under the current grouping; according to the number of wire pairs in each group, allocating a pilot sequence for each group, at least one pair of non-orthogonal pilot sequences existing among different groups; and performing estimation on the crosstalk channel of each group using the pilot sequence allocated for each group. The adoption of the present invention can shorten the time required for the estimation process of a crosstalk channel.

Description

technical field [0001] The present invention relates to the field of network technology, in particular to a crosstalk channel estimation method, device and system. Background technique [0002] xDSL (xDigitalSubscriberLine, various types of digital subscriber lines) is a high-speed data transmission technology transmitted over telephone twisted pair lines, using discrete multi-tone modulation. The system that provides multiple xDSL access is called DSLAM (DSLAccessMultiplexer, DSL access multiplexer). Due to the principle of electromagnetic induction, the multiple signals carried by the multiple lines connected to the DSLAM will interfere with each other, which is called crosstalk. , crosstalk can be divided into NEXT (NearEndCross-Talk, near-end crosstalk) and FEXT (FarEndCross-Talk, far-end crosstalk). The received signal is interfered by the transmitted signal of the remote device. The uplink and downlink channels of xDSL adopt frequency division multiplexing, so the ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B3/32
CPCH04L25/0204H04B3/32H04L25/0224
Inventor 陈兆梅王祥吕捷黄庆
Owner HUAWEI TECH CO LTD