Frame synchronisation for qam

H - Electricity – 04 – L

Patent

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H04L 27/34 (2006.01)

Patent

CA 2106848

Frames synchronisation for data transmitted using quadrature amplitude modulation is achieved by providing that one symbol per frame is chosen from a larger signal point constellation than the remaining symbols. Thus, bits are assembled (2) into groups of unequal size to control the mapping (7) between the data and the signal points. Where constellations having a number of points not equal to a power of two, these may be coded in groups: or the data may be converted into a mixed-base number the bases of which correspond to the numbers of points in the respective constellations.

L'invention est une méthode de synchronisation de blocs de données transmises par modulation d'amplitude en quadrature dans laquelle un symbole par bloc est choisi parmi une constellation de points de signal plus vaste que celle des symboles restants. Les bits sont ainsi groupés (2) en ensembles de tailles différentes pour contrôler la correspondance (7) entre les données et les points de signal. Dans le cas d'une constellation dont le nombre de points n'est pas égal à une puissance de 2, ces points peuvent être codés en groupes; les données peuvent également être converties en des nombres correspondant aux nombres des points dans les diverses constellations.

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