France Telecom

Mohamed Tlich

Fabienne Moulin

Eric Debeau

Ahmed Zeddam

Bastien Lamer

The invention relates in particular to a method of adjusting power spectral densities of a plurality of telecommunications lines sending data in a plurality of frequency sub-bands, a power spectral density being assigned to each sub band sending data. The method comprises the following steps: selecting at least one line, called the donor line, whose capacity for sending data is higher than a predetermined reference capacity, selecting at least one sub band of said donor line, and reducing the power spectral density assigned to the selected sub band to a predefined minimum power level in said sub band.

Device and a method for adjusting power spectral densities of a plurality of telecommunications lines

A method of allocating a plurality of subbands to a plurality of streams of a multichannel link in a multicarrier modulation communications system, each stream being successively defined in a communications frame of said multichannel link by a number Mof bits to be transmitted and a noise margin &#x393;. Each subband is associated with a normalized signal-to-noise ratio on the multichannel link. The subbands are classified in a specific order of the normalized signal-to-noise ratios. An energy Eper subband is determined by a binary allocation algorithm. For each stream taken in the order of said frame, a number Nof consecutive subbands taken in the order of normalized signal-to-noise ratios is allocated so that the sum of the numbers nof bits in each subband allocated to each stream is equal to Mwhere: and n=log(1+E&#xb7;(SNR)/&#x393;).

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Lannion, France

Mohamed Tlich