Device and method for precoding data signals for pcm...

H - Electricity – 04 – L

Patent

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H04L 25/49 (2006.01) H04L 25/03 (2006.01)

Patent

CA 2317545

A device and method for precoding data signals for pulse code modulation (PCM) transmission including a transmitter (52) for transmitting a sequence of analog levels over analog channel to a quantization device, wherein the analog channel modifies the transmitted analog levels, the transmitter (52) comprising: a mapping device (150) for mapping data bits to be transmitted to a sequence of equivalence classes, wherein each equivalence class contains one or more constellation points; and a constellation point selector (152) interconnected to the mapping device (150) which selects a constellation point in each equivalence class to represent the data bits to be transmitted and which transmits an analog level that produces the selected constellation point at an input to the quantization device.

Un dispositif et un procédé permettant de précoder des signaux de données destinés à la transmission par modulation par impulsions codées (MIC) comprennent un émetteur (52) qui envoie à un numérisateur une séquence de niveaux analogiques sur un canal analogique, ledit canal analogique modifiant les niveaux analogiques transmis. L'émetteur (52) comprend: un dispositif (150) de mappage qui cartographie les bits d'information devant être transmis sous forme d'une séquence de classes d'équivalence, chaque classe d'équivalence contenant un ou plusieurs points de constellation; et un sélecteur (152) de point de constellation relié au dispositif (150) de mappage qui sélectionne un point de constellation dans chaque classe d'équivalence pour représenter les bits d'information devant être transmis et qui envoie un niveau analogique qui produit le point de constellation à une entrée du numérisateur.

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