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Method, system and equipment for crosstalk elimination of xDSL multiple lines

一种串扰消除、信号对的技术，应用在传输系统、基带系统、数字传输系统等方向，能够解决处理器运算量增加等问题，达到消除串扰、实现串扰消除、简化运算的效果

Inactive Publication Date: 2008-03-05
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the embodiments of the present invention is to provide a method and system for eliminating xDSL multi-pair crosstalk, so as to solve the problem of a sharp increase in processor calculations caused by excessive channel transmission matrix in Vectored-DSL technology

Method used

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  • Method, system and equipment for crosstalk elimination of xDSL multiple lines
  • Method, system and equipment for crosstalk elimination of xDSL multiple lines
  • Method, system and equipment for crosstalk elimination of xDSL multiple lines

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: Switching matrix adopts relay matrix

[0044] 1. First, divide the 24 signals into 6 signal sets through the greedy algorithm, such as user 1 (line pair 1) and user 2 (line pair 2), user 7 (line pair 7) and user 8 (line pair 8) The influence of crosstalk between each other is greater, then user 1, user 2, user 7, and user 8 form a signal set, and so on, user 3, user 4, user 5, and user 15 form another signal set,... ..., split the other 16 signals in the 24 signals into another 4 signal sets.

[0045] 2. As shown in Figure 6 and Figure 7, the DSLAM sends a control signal through the NMS (Network Management System, Network Management System), and the relay matrix switches the selection switch of the relay matrix after receiving this signal, and the line pair 1 and the line pair 2 The signals of line pair 7 and line pair 8 are processed by a processor (Processor 1) after A / D conversion. Similarly, line pair 3, line pair 4, line pair 5 and line pair 15 are c...

Embodiment 2

[0047] Embodiment 2: switch matrix adopts digital matrix

[0048] Step 1 in this embodiment is the same as step 1 in Embodiment 1;

[0049] In step 2, the digital matrix is ​​used to select the signal. Compared with the analog matrix (relay matrix), the digital matrix has larger capacity and better maintainability. At the DSLAM end, the digital matrix can also be used to divide step 1 into the same Signals in a signal set are connected to the same processor for arithmetic processing. The principle of using the digital matrix to realize line switching is shown in Figure 8. First, the subscriber line signal from the AFE (analogfront end) is A / D converted and then connected to the digital switching matrix. The digital switching matrix passes through the digital switching matrix as shown in Figure 9. The multiplexer is used to realize the signal selection, and then the selected signals (signals belonging to the same signal set) are connected to the same processor for calculation ...

Embodiment 3

[0051] Embodiment three: switch matrix adopts digital matrix and relay matrix

[0052] As shown in Figure 10, the digital matrix and the relay matrix can also be used simultaneously to realize signal switching, and the transmission matrix on the processor can be simplified into two small transmission matrices by using the digital matrix and the relay matrix at the same time. For example a single The transmission matrix can be made into 5 matrix and 5 matrix, then this large matrix is ​​simplified.

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Abstract

This invention discloses a method and a device for eliminating crosstalk of xDSL, in which, the method includes: a, dividing multiple signals into two or more than two signal sets, b, connecting signals belonging to a same signal set to a same processor in a DSLAM for process, which reduces operations of transmission matrix on a processor and realizes elimination of crosstalk.

Description

technical field [0001] The present invention relates to the technical field of Digital Subscriber Line (Digital Subscriber Line, DSL), in particular, to the technology of eliminating crosstalk in DSL. Background technique [0002] The xDSL for passband transmission adopts discrete multi-tone modulation (Discrete Multi-Tone Modulation, DMT) technology for modulation and demodulation. A system that provides multiple DSL access is called a DSL Access Multiplexer (DSL Access Multiplexer, DSLAM), and its system connection relationship is shown in FIG. 1 . The DSLAM 120 includes a client transceiver unit 121 and a splitter / integrator 122. In the uplink direction, the client transceiver unit 121 receives the DSL signal from the computer 110 and amplifies the received signal, and sends the processed DSL signal to the splitter / integrator 122; the separation / integrator 122 integrates the DSL signal from the client transceiver unit 121 and the POTS signal of the telephone terminal 13...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B3/04H04B1/10H04B3/32H04L25/08H04J99/00
CPCH04L25/022H04L25/03159H04L25/0246H04L5/14H04B3/32H04L2025/03414H04M11/062
Inventor 方李明李莹陈子欢
Owner HUAWEI TECH CO LTD
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