WO1995005042B1 - Procede et dispositif de synchronisation de trame dans des systemes mobiles de communication de donnees a multiplexage par repartition en frequence orthogonale - Google Patents

Procede et dispositif de synchronisation de trame dans des systemes mobiles de communication de donnees a multiplexage par repartition en frequence orthogonale

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Publication number
WO1995005042B1
WO1995005042B1 PCT/CA1994/000437 CA9400437W WO9505042B1 WO 1995005042 B1 WO1995005042 B1 WO 1995005042B1 CA 9400437 W CA9400437 W CA 9400437W WO 9505042 B1 WO9505042 B1 WO 9505042B1
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WO
WIPO (PCT)
Prior art keywords
sub
carriers
data
signal
synchronization
Prior art date
Application number
PCT/CA1994/000437
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English (en)
Other versions
WO1995005042A1 (fr
Filing date
Publication date
Priority claimed from US08/104,563 external-priority patent/US5444697A/en
Application filed filed Critical
Priority to AU74547/94A priority Critical patent/AU7454794A/en
Publication of WO1995005042A1 publication Critical patent/WO1995005042A1/fr
Publication of WO1995005042B1 publication Critical patent/WO1995005042B1/fr

Links

Abstract

Procédé et disposistif permettant d'effectuer la synchronisation de symbole (trame) de données numériques dans un canal de multiplexage par répartition en fréquence orthogonale (OFDM) tel qu'une liaison radioélectrique OFDM/MF. Le procédé et le dispositif sont adaptés à l'utilisation dans un environnement ALOHA pur étant donné que la synchronisation s'effectue sur une base trame par trame. Le temps système requis pour la largeur de bande est inférieur à 10 %. La performance de taux d'erreur de bit qu'on peut obtenir avec cette technique est de l'ordre de 1,5 dB de la performance assurant la synchronisation idéale. Le procédé et le dispositif utilisent un processus de synchronisation à trois étages. Premièrement le début d'une trame OFDM est détecté. Deuxièmement la synchronisation grossière s'effectue en échantillonnant le signal reçu, puis en mesurant la corrélation entre le signal reçu et un signal de référence. La synchronisation grossière assure la synchronisation dans plus ou moins 1/2 période d'échantillon. La corrélation est préférablement effectuée dans le domaine de fréquence après avoir fait subir aux données de signal échantillonné une transformation rapide de Fourier. Troisièmement la synchronisation s'effectue en calculant le décalage de temps entre le point de synchronisation grossière et le point de synchronisation réel et en utilisant le décalage de temps calculé pour déterminer la correction de phase à appliquer à chaque sous-porteuse acheminant des données. Pour terminer les données transmises sont récupérées en décodant les informations obtenues relatives à la phase et l'amplitude des sous-porteuses acheminant des données.
PCT/CA1994/000437 1993-08-11 1994-08-11 Procede et dispositif de synchronisation de trame dans des systemes mobiles de communication de donnees a multiplexage par repartition en frequence orthogonale WO1995005042A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU74547/94A AU7454794A (en) 1993-08-11 1994-08-11 Method and apparatus for frame synchronization in mobile ofdm data communication

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/104,563 1993-08-11
US08/104,563 US5444697A (en) 1993-08-11 1993-08-11 Method and apparatus for frame synchronization in mobile OFDM data communication

Publications (2)

Publication Number Publication Date
WO1995005042A1 WO1995005042A1 (fr) 1995-02-16
WO1995005042B1 true WO1995005042B1 (fr) 1995-04-06

Family

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Family Applications (1)

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PCT/CA1994/000437 WO1995005042A1 (fr) 1993-08-11 1994-08-11 Procede et dispositif de synchronisation de trame dans des systemes mobiles de communication de donnees a multiplexage par repartition en frequence orthogonale

Country Status (3)

Country Link
US (1) US5444697A (fr)
AU (1) AU7454794A (fr)
WO (1) WO1995005042A1 (fr)

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