Alcatel Lucent

Alcatel

Alcatel-lucent USA Inc.

Luc Vandendorpe

Jochen Maes

Philip Alfred Whiting

Gerhard Guenter Theodor Kramer

Jan Sylvia Verlinden

Thierry Pollet

Philippe Antoine

Miroslav Zivkovic

Michael Peeters

Geert Bert Ysebaert

Mamoun Guenach

Jerome Louveaux

Francois Alain Roger Deryck

Pieter Geeraerts

A method involves performing a plurality of acts. The acts include transmitting a first signal stream to a first channel of a multi-channel communications medium while transmitting a second signal stream to a different second channel of the medium. The second signal stream is substantially temporally correlated to the first signal stream. The method includes receiving an SINR measured at a receiver configured to receive signals from the first channel. The SINR is measured while the receiver received the first signal stream. The method includes determining a channel matrix element between the first and second channels or a ratio of said channel matrix element to a diagonal element of the channel matrix. The act of determining is based on the received SINR.

Determining channel matrices by correlated transmissions to different channels

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.

Optimised bit allocation adapted for VDSL

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Louvain-la-Neuve, Belgium

Luc Vandendorpe