On the Impedance Mismatch Channel Model of G.fast Digital Subscriber Line

LI Qiao-jie

doi:10.3969/j.issn.0372-2112.2020.02.025

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On the Impedance Mismatch Channel Model of G.fast Digital Subscriber Line

更新时间：2025-07-16

- On the Impedance Mismatch Channel Model of G.fast Digital Subscriber Line
- Acta Electronica Sinica Vol. 48, Issue 2, Pages: 403-406(2020)
- 作者机构：
  
  1. 广东外语外贸大学数学与统计学院,广东,广州,510006
  2. 广东外语外贸大学数学与统计学院,广东,广州,510006
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2020.02.025
  CLC： TN913.32
- Published Online：25 February 2020，
  
  Published：2020
- 稿件说明：
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LI Qiao-jie. On the Impedance Mismatch Channel Model of G.fast Digital Subscriber Line[J]. Acta Electronica Sinica, 2020, 48(2): 403-406.
DOI：

LI Qiao-jie. On the Impedance Mismatch Channel Model of G.fast Digital Subscriber Line[J]. Acta Electronica Sinica, 2020, 48(2): 403-406. DOI： 10.3969/j.issn.0372-2112.2020.02.025.

摘要

基于数字信号传播理论中的反射原理，采用反射系数刻画线路阻抗不匹配程度，利用线路阻抗匹配时测量得到的信道数据（直接信道、远端串扰信道和近端串扰信道），建立了一个G.fast数字用户线路阻抗不匹配时信道数学模型.当线路终端处于断开时，利用该模型生成的信道数据与实际测量的信道数据基本吻合，证明了该模型的正确性.由于采用反射系数刻画线路阻抗不匹配程度，该信道模型可仿真终端设备在不同阻抗值的情况下对通信系统信噪比的影响，从而提出线路终端设备阻抗最大允许的变化范围，为终端设备制造商在阻抗设计时提供一定的理论指导.

Abstract

Based on the reflection principle of digital signal propagation theory

a mathematical model of G.fast channel is established when the impedance of digital subscriber line is not matched. The reflection coefficient is used to describe the line impedance mismatch and the channel data (direct channel

far-end crosstalk channel and near-end crosstalk channel) measured when line impedance matching are used in the model. When the terminal is disconnected

the channel data calculated by the model is consistent with the actually measured data

which proves the accurateness of the model. Since the reflection coefficient is used to describe the degree of impedance mismatch

the model can simulate the influence of the terminal equipment on the signal noise ratio of the communication system under different impedances. Therefore

we propose a maximum allowable variation range of the terminal impedance which provides some theoretical guidance for terminal manufacturer for designing terminal impedance.

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