Process for synchronization in the downstream of multiple...

Details Process for synchronization in the downstream of multiple... Process for synchronization in the downstream of multiple...

H - Electricity

04

J

H04J 11/00 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2448106

The invention relates to a system that is suitable for bidirectional communication via the electrical network between a headend and numerous users. Said invention can be used for both time and frequency synchronisation of multiple users in an OFDM (Orthogonal Frequency Division Multiplexing) multi- carrier communication system. The inventive method is characterised in that it consists in generating synchronisation sequences using two identical synchronisation symbols (16) which are transmitted periodically from the headend equipment by means of the downlink to the users. The sampling frequency can then be determined and corrected and, simultaneously, the moment at which the OFDM symbol starts can be determined, such that the samples of the signal received by each user match those used in the transmission.

L'invention concerne un système applicable dans la communication bidirectionnelle à travers le réseau électrique entre un dispositif de tête et une pluralité d'utilisateurs, permettant la synchronisation d'un point de vue temporel et fréquentiel de multiples utilisateurs dans un système de communication multiporteuse OFDM (modulation de multiplexage par répartition orthogonale en fréquence). Ledit système se caractérise en ce qu'il consiste à générer des séquences de synchronisme à l'aide de deux symboles de synchronisme identiques (16), transmis de manière périodique du dispositif de tête par la liaison descendante aux utilisateurs, afin d'estimer et de corriger la fréquence d'échantillonnage et, en même temps, d'estimer le moment auquel commence chaque symbole OFDM de manière que les échantillons du signal reçu pour chacun des utilisateurs coïncident avec ceux utilisés dans la transmission.

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