The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 15, 2005
Filed:
Jan. 06, 2003
Philippe Antoine, Walhain, BE;
Thierry Pollet, Mechelen, BE;
Francois Alain Roger Deryck, Wahlhain-Saint-Paul, BE;
Luc Vandendorpe, Louvain-La-Neuve, BE;
Pieter Geeraerts, St-Martens-Latem, BE;
Philippe Antoine, Walhain, BE;
Thierry Pollet, Mechelen, BE;
Francois Alain Roger Deryck, Wahlhain-Saint-Paul, BE;
Luc Vandendorpe, Louvain-La-Neuve, BE;
Pieter Geeraerts, St-Martens-Latem, BE;
Alcatel, Paris, FR;
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.