Optimised bit allocation adapted for VDSL

Details Optimised bit allocation adapted for VDSL Optimised bit allocation adapted for VDSL

2005-02-15

2005-02-15

McElheny, Jr., Donald E. (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system

Measured signal processing

C375S254000

Reexamination Certificate

active

06856947

ABSTRACT:
The invention relates to a modem and a method for providing bit loading computation in a multi-carrier communication system, using a plurality of simultaneous different carriers or tones by measuring the signal to noise ratios (SNRs) for carriers and by determining in dependence of the SNR a related number of bits to be allocated to the respective carrier. The method comprises the steps of providing a sliding window having a frequency width able to contain a predetermined number of the carriers, moving the sliding window over the frequency spectrum of the carriers through a plurality of positions of the window with respect to the carrier frequencies, and when the window contains the predetermined number of the carriers and there is at least one further carrier to be positioned in the window as a new carrier for bit allocation, the window is moved such that on entering a new carrier into the window at one of its borders, a carrier already in the window at the other frequency border leaves the window. For each position of the window determining bit allocation for the respective at least one carrier, and in the event that a predetermined average power spectrum density threshold (TPSD) of the carriers over the window for the present window position is not respected, selecting at least one carrier within the window for power spectrum density reduction.

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