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Alien interference removal in vectored DSL

  • US 8,619,843 B2
  • Filed: 08/08/2009
  • Issued: 12/31/2013
  • Est. Priority Date: 08/13/2008
  • Status: Active Grant
First Claim
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1. A vectored digital subscriber line (DSL) system comprising:

  • a plurality of active lines, wherein each active line comprises;

    a downstream-end modem coupled to an upstream-end modem with a twisted copper pair;

    wherein each active line is configured to use an upstream DSL frequency set to transmit upstream DSL user signals from the downstream-end modem to the upstream-end modem;

    one or more pseudo signal source lines, wherein a pseudo signal comprises in-domain interference and correlated alien interference, each pseudo signal source line comprising at least one of the following;

    an inactive line, wherein the inactive line comprises;

    a twisted copper pair coupled to an upstream-end modem;

    wherein no upstream DSL user signals are sent to the upstream-end modern using the upstream DSL frequency set;

    a common-mode voltage signal source line comprising a twisted copper pair coupled to an upstream-end modem, wherein the upstream-end modem comprises;

    an analog front-end comprising a hybrid configured to generate a common-mode voltage signal from transmissions on the common-mode voltage signal source line received by the upstream-end modem; and

    a fast Fourier transform unit for generating pseudo signals derived from the generated common-mode voltage signals;

    wherein the common-mode voltage signal source line is one of the following;

    one of the plurality of active lines;

    or a line other than one of the plurality of active lines;

    a vectoring unit coupled to the upstream-end modems of the plurality of active lines and to the upstream-end modem of the inactive line, wherein the vectoring unit is configured to;

    collect upstream DSL user signals received by the upstream-end modems of the plurality of active lines;

    collect pseudo signals from one or more of the pseudo signal source lines;

    remove the in-domain interference from the collected pseudo signals and generate alien interference data; and

    perform vectoring of DSL transmissions on the plurality of active lines using the collected upstream DSL user data and the alien interference data.

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