The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 23, 2012
Filed:
Mar. 23, 2007
Boris Dortschy, Hägersten, SE;
Jaume Rius I Riu, Vällingby, SE;
Rodrigo Bastos Moraes, Rio de Janeiro, BR;
Aldebaro Klautau, Belém, BR;
Ronaldo Zampolo, Belém, BR;
Boris Dortschy, Hägersten, SE;
Jaume Rius i Riu, Vällingby, SE;
Rodrigo Bastos Moraes, Rio de Janeiro, BR;
Aldebaro Klautau, Belém, BR;
Ronaldo Zampolo, Belém, BR;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A method, central unit, and modem for reducing crosstalk in a Digital Subscriber Line (DSL) system. A virtual line referred to as a ghost line is introduced in the system as a substitution for all of the lines except a first line to induce crosstalk to the first line. The Power Spectral Density (PSD) on the first line is allocated to optimize against the ghost line. A modem on the first line reports to a central Spectrum Management Center (SMC), a measure indicating crosstalk impact from the ghost line. This process is repeated for each line. The SMC calculates updated ghost line parameters for each line, which reflect current crosstalk characteristics between each modem and the remaining modems, and sends the updated parameters to the modems. The modems then reallocate PSDs with respect to the updated ghost line parameters to either maximize the rate or minimize the power on their respective lines.