Digital audio broadcasting method using puncturable...

H - Electricity – 04 – L

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H04L 27/26 (2006.01) H04H 20/44 (2008.01) H03M 13/23 (2006.01)

Patent

CA 2326531

A broadcasting method encodes program material using convolutional codes having non-puncturable bits and puncturable bits and modulates orthogonal frequency division multiplexed carrier signals with the convolutional codes. The non-puncturable bits are carried by a first group of the carriers and the puncturable bits are carried by a second group of the carriers, where the first group of carrier signals is less susceptible to interference than the second group of carrier signals. The carrier signals are then broadcast to receivers which determining if the carriers in the second group have been corrupted and erase puncturable bits carried by any of the carriers which have been determined to be corrupted. This produces punctured codes which are subsequently decodes to recover the program material.

L'invention concerne un procédé de diffusion permettant de coder un matériau de programme, à l'aide de codes à convolutions possédant des bits poinçonnés ou non, et de moduler des signaux de porteuse multiplexés à répartition orthogonale de fréquence, à l'aide de codes à convolutions. Les bits non poinçonnés sont portés par un premier groupe de porteuses, et les bits poinçonnés sont portés par un second groupe de porteuses, le premier groupe de signaux de porteuse étant moins susceptible d'interférence avec le second groupe de signaux de porteuse. Les signaux de porteuse sont ensuite diffusés à des récepteurs qui déterminent si les porteuses de second groupe ont été altérées et effacent les bits poinçonnés portés par une porteuse désignée comme étant altérée, ce qui produit des codes poinçonnés qui sont ensuite décodés de façon à récupérer le matériau de programme.

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