Process and system for the ofdm multi-carrier transmission...

H - Electricity – 04 – J

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H04J 11/00 (2006.01) H04L 27/18 (2006.01) H04L 27/26 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2248572

Improvement of an existing DAB transmission system, so that a higher net data rate can be achieved while maintaining the same system quality, or the same system quality can be achieved with a much lower signal-to-noise ratio on the receiver side at the same net data rate. A symbol mapper is connected directly downstream from a convolution encoder instead of to the block generator, as in the case of the DAB system. A multi- stage channel encoder, to which the data substreams of a source date stream are distributed, is used. The source data stream is processed on the complex symbol level and not on the bit level, as in the case of known DAB systems.

L'invention a pour but de perfectionner un système de transmission RAN existant, de manière à obtenir, pour une qualtié constante du système, un débit net de données plus élevé ou, pour un débit net de données constant, la même qualité du système pour un rapport signal/bruit côté réception sensiblement plus faible. Ce but est atteint, conformément à l'invention, grâce au fait qu'une table de correspondance de symboles (40) est connectée en série, non pas, comme dans le système RAN, à la suite d'un dispositif de formation de blocs (155), mais immédiatement à la suite d'un codeur de convolution (30). En outre, on utilise un dispositif de codage de canaux multiétage sur lequel les flux à débit partiel d'un flux de données de base sont répartis. Grâce à cette disposition, le flux de données de base est traité, non pas comme dans le système RAN connu, sur le plan des bits, mais sur le plan de symboles complexes.

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