Multicarrier modulation transmission system with variable delay

H - Electricity – 04 – L

Patent

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Details

H04L 27/26 (2006.01) H04L 1/00 (2006.01) H04M 11/06 (2006.01)

Patent

CA 2113330

A transmission system using multicarrier modulation applies FECC (forward error correcting code) coding and codeword interleaving differently to input signals from a plurality of different data channels to produce encoded data signals having different reliabilities and different coding delays. Bits of encoded data signals having relatively less delay are allocated to carriers that are subject to relatively more attenuation and/or channel noise, and hence that are allocated fewer bits for transmission in each symbol period, to reduce the effects of impulse noise. The data channels can comprise video, data, and control channels transmitted on an ADSL (asymmetric digital subscriber line) two-wire telephone line.

Un système de transmission utilisant la modulation multiporteuse applique le codage FECC (code à correction aval des erreurs) et l'imbrication de mots codés différemment à des signaux d'entrée provenant d'un certain nombre de canaux de données différents afin de produire des signaux de données codés ayant différents degrés de fiabilité et différents délais de codage. Les bits des signaux de données codés à délais relativement courts sont affectés à des porteuses qui sont relativement moins vulnérables à l'affaiblissement et(ou) au bruit dans les canaux, et auxquelles sont donc affectés moins de bits à transmettre dans chaque période de symbole, afin de réduire les effets du bruit impulsionnel. Les canaux de données peuvent comprendre des canaux vidéo, de données et de commande utilisant une ligne téléphonique bifilaire ADSL (ligne d'abonné numérique asymétrique).

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