Noise measurement method and a related receiving digital subscriber line modem

A technology for modems and digital subscriber lines, applied in the direction of error detection/prevention using signal quality detectors, multi-frequency code systems, multi-carrier systems, etc., and can solve problems such as insufficient stable modem connections

Inactive Publication Date: 2006-06-21
ALCATEL LUCENT SAS
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, noise measurements are no...

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  • Noise measurement method and a related receiving digital subscriber line modem
  • Noise measurement method and a related receiving digital subscriber line modem
  • Noise measurement method and a related receiving digital subscriber line modem

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Embodiment Construction

[0041] In the following, with reference to the accompanying drawings, embodiments of a method of noise measurement, a related transmitter and a related receiver according to the present invention will be explained. The first paragraph of this note will describe as figure 2 The main components of the communication network are shown. All connections between the aforementioned components and the described device are defined in the second paragraph. Subsequently, described as figure 2 All relevant functional devices of the receiver above are shown, and then all interconnections are described. The actual implementation of the noise measurement method is described in the following paragraphs.

[0042] The basic components of a digital subscriber line communication network according to an embodiment of the present invention are a transmitter DTE and a receiver. In this embodiment, the transmitter DTE is selected as a central office and the receiver is selected as a subscriber term...

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Abstract

The invention relates to a noise measurement method and related equipment for noise measurement in a digital subscriber line transmission system. The system includes a sending DSL modem and a receiving DSL modem, wherein the sending DSL modem is connected to the receiving DSL modem by a communication line. The method of the present invention includes the step of receiving, at the receiving digital subscriber line modem, symbols transmitted by the transmitting modem. The receiving DSL modem then demaps the received symbols onto constellation points. The receiving DSL modem then performs noise measurements based on the differences between the received symbols and the determined constellation points. Further, the frequency of the incorrectly demapped symbol is determined by the receiving DSL modem, and the frequency of the incorrectly demapped symbol is then used by the receiving DSL modem to correct the noise measurement.

Description

technical field [0001] The invention relates to a noise measurement method for noise measurement in a digital subscriber line transmission system and an associated receiving digital subscriber line modem. Background technique [0002] Such methods and related equipment are known in the art, for example from "ADSL / VDSL Principles" by Dr. Dennis J. Rauschmayer, published by Macmillan Technical Books. ", Chapter 6, page 159, the application and in-depth research of asymmetric digital subscriber line and ultra-high-speed digital subscriber line. [0003] In such a digital subscriber line modem, the transmission of the data of the data stream takes place using discrete multiple tones and is based on quadrature amplitude modulation (QAM), in which the bits of the data stream are modulated on a carrier signal comprising multiple tones. The modulation is performed by bit-mapping the bits of the multiple data streams to a single symbol on each of the multiple tones of the carrier si...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/34
CPCH04L1/20
Inventor E·A·H·范 登 博盖尔特
Owner ALCATEL LUCENT SAS
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