Method for receiving frames of a digital data stream

Details Method for receiving frames of a digital data stream Method for receiving frames of a digital data stream

H - Electricity

04

J

H04J 3/06 (2006.01) H04N 21/242 (2011.01) H04N 7/24 (2011.01)

Patent

CA 2625710

A receiving method for a digital stream, the stream including frames having each a body composed of a variable number c of symbols and preceded by a header including d symbols, a field composed of a fixed number e of symbols unknown to the receiver and defining the number c. A locking phase of the receiving method includes receiving a series of e symbols of the stream; performing a correlation computation for pairs of symbols received, the correlation computation being used to verify a predefined relationship if the e symbols form the unknown field; determining a correlation level and determining whether the e symbols form the unknown field on the basis of the correlation level; repeating the steps until it is determined that the e symbols form the unknown field.

L'invention concerne un procédé de réception d'un flux numérique, le flux comprenant des trames (1) présentant chacune un corps (Sl, Pl, S2, P2, S3) ayant un nombre variable de (c) symboles et précédé d'un entête (C, I) ayant (d) symboles, un champ (I) composé d'un nombre fixe de e symboles inconnus du récepteur et définissant (c). Une phase d'accrochage comprend les étapes suivantes : a) recevoir une suite de (e) symboles du flux; b) pour des couples de symboles reçus, effectuer un calcul de corrélation, cette corrélation étant supposée vérifier une relation prédéfinie si les e symboles forment le champ inconnu ; c) déterminer un niveau de corrélation et déterminer si les e symboles forment le champ inconnu en fonction de ce niveau de corrélation ; d) répéter les étapes a), b) et c) jusqu'à déterminer que les e symboles forment le champ inconnu.

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