US 2006/0133534 A1Published application

Method and apparatus for determining a transmit PSD at a remote location

AssigneeAlcatel

InventorsJan Verlinden, Etienne Andre Hubert Van Den Bogaert, Geert Bert Maarten Ysebaert

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Abstract

The present invention relates to a method for determining a transmit PSD over a remotely-deployed line, which method comprising the steps of: modeling a first far-end crosstalk originating from the line and coupling into a centrally-deployed victim neighboring line, modeling a second far-end crosstalk originating from a further centrally-deployed neighboring line and coupling into the victim neighboring line, determining the transmit PSD from the first modeled far-end crosstalk and the second modeled far-end crosstalk. A method according to the invention further comprises the steps of: expressing the transmit PSD as a function of a line parameter characterizing a line segment of the further neighboring line, carrying out channel measurements of a spare line that connects the central location to the remote location, and that shares common transmission characteristics with the line segment, estimating from said channel measurements a value of the line parameter, determining therefrom the transmit PSD. The present invention also relates to a power control unit.

Claims7

Dependent claims

A method for determining a transmit power spectral density (Sa) to be applied at a remote location (loc2) over at least one line (21a) connecting said remote location to at least one customer location (loc3a), and comprising the steps of:

modeling a first far-end crosstalk (41, 43) originating from said at least one line and coupling into a victim neighboring line (21b) as a first modeled far-end crosstalk, which victim neighboring line connecting a central location (loc1) through said remote location to a neighboring customer location (loc3b),
modeling a second far-end crosstalk (42, 44) originating from at least one further neighboring line (21c) and coupling into said victim neighboring line as a second modeled far-end crosstalk, which at least one further neighboring line connecting said central location through said remote location to at least one further neighboring customer location (loc3c),
determining, by means of a mathematical derivation, said transmit power spectral density from said first modeled far-end crosstalk and said second modeled far-end crosstalk,
characterized in that said method further comprises the steps of:
expressing, as part of said mathematical derivation, said transmit power spectral density as a function (g) of a line parameter (Ld, |H(Ld,f)|), which line parameter characterizing a line segment (22c) of said at least one further neighboring line spanning from said central location to said remote location,
carrying out channel measurements (chd_meas) of a spare line (21d) that connects said central location to said remote location, which spare line and which line segment sharing common transmission characteristics,
estimating from said channel measurements a value (Lde, |He(Ld,f)|) of said line parameter,
determining therefrom said transmit power spectral density.

5 more elements

A power control unit (51) adapted to determine a transmit power spectral density (Sa) to be applied at a remote location (loc2) over at least one line (21a) connecting said remote location to at least one customer location (loc3a), and comprising a computing means (Cpt) adapted to determine, by means of a mathematical derivation, said transmit power spectral density from a first modeled far-end crosstalk and a second modeled far-end crosstalk,

which first modeled far-end crosstalk modeling a first far-end crosstalk (41, 43) originating from said at least one line and coupling into a victim neighboring line (21b), which victim neighboring line connecting a central location (loc1) through said remote location to a neighboring customer location (loc3b),
which second modeled far-end crosstalk modeling a second far-end crosstalk (42, 44) originating from at least one further neighboring line (21c) and coupling into said victim neighboring line, which at least one further neighboring line connecting said central location through said remote location to at least one further neighboring customer location (loc3c),
characterized in that said computing means is further adapted to express, as part of said mathematical derivation, said transmit power spectral density as a function (g) of a line parameter (Ld, |H(Ld,f)|), which line parameter characterizing a line segment (22c) of said at least one further neighboring line spanning from said central location to said remote location,
in that said transmit power control unit further comprises:
a measurement means (Measd) adapted to carry out channel measurements (chd_meas) of a spare line (21d) that connects said central location to said remote location, which spare line and which line segment sharing common transmission characteristics,
an estimation means (Est) coupled to said measurement means, and adapted to estimate from said channel measurements a value (Lde, |He(Ld,f)|) of said line parameter,
and in that said computing means is coupled to said estimating means, and is further adapted to determine therefrom said transmit power spectral density.

4 more elements

Dependencies are inferred from the claim text.