VERFAHREN ZUR DOWNLINK SYNCHRONISATION FÜR EIN PUNKT-ZU-MEHRPUNKT-SYSTEM MIT OFDM-MODULATION

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-c...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	IRANZO MOLINERO, SALVADOR, FOUREN, NILS, BLASCO CLARET, JORGE VICENTE, GAVILLERO MARTIN, JUAN MIGUEL, JIMENEZ MARQUINA, FRANCISCO JAVIER, RIVEIRO INSUA, JUAN CARLOS
Format:	Patent
Sprache:	ger
Schlagworte:	ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY MULTIPLEX COMMUNICATION TRANSMISSION TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	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.