Coded modulation for fading channels

H - Electricity – 04 – L

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H04L 27/34 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2271768

Source symbols are encoded by partitioning the source symbols into a number of classes. This principle is applied in a number of alternative transmitter and receiver embodiments. In one embodiment a corresponding encoder is provided for each of the classes, and for each class, each of the source symbols is supplied to the corresponding encoder. For each encoder, coded symbols are supplied at an encoder output and the coded symbols are partitioned into a number of levels associated with the corresponding class, wherein at least one of the classes has at least two levels assigned to it. The partitioned coded symbols are then supplied to a mapper that generates amplitude coefficient signals. Corresponding receivers perform inverse operations to those performed by the transmitters.

Les symboles origine sont codés pour utilisation par un modulateur de niveau supérieur par répartition des symboles origine en plusieurs classes. On applique ce principe à plusieurs réalisations d'émetteurs et de récepteurs de remplacement. Pour l'une des réalisations, chacune des classes dispose du codeur correspondant, chacun des symboles origine étant remis, au niveau de chaque classe, au codeur correspondant. Pour chaque codeur, des symboles codés sont remis à la sortie d'un codeur, les symboles codés étant répartis en plusieurs niveau associés à la classe correspondante, à raison de deux niveaux au moins affectés à l'une au moins des classes. Les symboles codés répartis sont alors remis à un module de mise en correspondance qui génère des signaux de coefficient d'amplitude. Les récepteurs correspondants effectuent les opérations inverses à celles effectuées par les émetteurs.

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