Near-end crosstalk noise minimization and power reduction for digital subscriber loops
AssigneeSTMicroelectronics S.r.l.
InventorXianbin Wang
Life of this patent
Estimating the term…
Abstract
To optimize the performance of DSL modems in the same cable bundle, the size and position of the bandwidth used for transmission is intelligently selected when the bit rate necessary for making the transmission is less than the total available bandwidth. By intelligently selecting a minimum number of subcarriers for Digital Multi-tone (DMT) signal transmission, a reduction in line driver power consumption is effectuated. Additionally, by intelligently selecting the position of the used bandwidth within the total available bandwidth, near-end crosstalk (NEXT) noise within the cable bundle may be minimized.
Claims34
A method for optimizing digital subscriber line (DSL) communications performance over a cable bundle having a plurality of loops and including at least one active DSL loop, comprising the steps of:
- determining, for a new DSL loop communication, a required bit rate of that new DSL loop communication, the determined required bit rate corresponding to a required bandwidth that is smaller than a total available bandwidth on one of the plurality of loops;
- calculating, for a plurality of location positions of the required bandwidth for the new DSL loop communication within the total available bandwidth, a crosstalk noise effect with respect to the at least one active DSL loop;
- and
- choosing a location position for the required bandwidth to carry the new DSL loop communication within the total available bandwidth where the calculated crosstalk noise effect with respect to the at least one active DSL loop is minimized.
Apparatus for optimizing digital subscriber line (DSL) communications performance over a cable bundle having a plurality of loops and including at least one active DSL loop, comprising:
- means for determining, for a new DSL loop communication, a required bit rate of that new DSL loop communication, the determined required bit rate corresponding to a required bandwidth that is smaller than a total available bandwidth on one of the plurality of loops;
- means for calculating, for a plurality of location positions of the required bandwidth for the new DSL loop communication within the total available bandwidth, a crosstalk noise effect with respect to the at least one active DSL loop;
- and
- means for choosing a location position for the required bandwidth to carry the new DSL loop communication within the total available bandwidth where the calculated crosstalk noise effect with respect to the at least one active DSL loop is minimized.
A digital subscriber line (DSL) transmitter connected to a certain loop in a cable bundle having a plurality of other loops and including active DSL loop communications on the other loops, comprising:
- an ATM idle cell removal machine that is operable to determine for a new DSL loop communication on the certain loop a required bit rate that corresponds to a required bandwidth smaller than a total available bandwidth on that certain loop;
- a noise estimation algorithm that is operable to calculate, at each one of a plurality of possible required bandwidth positions within the total available bandwidth, a crosstalk noise effect of the new DSL loop communication with respect to the active DSL loop communications on the other loops;
- and
- a noise minimization algorithm that is operable to choose one of the possible positions as a location of the required bandwidth within the total available bandwidth, wherein the calculated crosstalk noise effect with respect to the active DSL loop communications on the other loops at the chosen one of the possible positions is minimized.
Dependencies are inferred from the claim text.