Direct digital synthesis in a qam demodulator

Details Direct digital synthesis in a qam demodulator Direct digital synthesis in a qam demodulator

H - Electricity

04

L

H04L 27/38 (2006.01) H04L 27/00 (2006.01)

Patent

CA 2416960

A QAM demodulator is disclosed, which comprises two direct digital synthesizer circuits, for the provision of carrier synchronisation. The first DDS is located upstream of the receivers root-raised-cosine filter, and ensures frequency synchronisation, whilst the second DDS is downstream of the filter and ensures phase synchronisation.

La présente invention concerne un démodulateur de type de modulation d'amplitude en quadrature comportant une paire de circuits de synthèse numérique directe. Le premier circuit de synthèse numérique directe (30) est situé dans un circuit de conversion de bande de base avant un filtre de réception (40) et accorde le signal numériquement au sein de la bande passante du filtre. Le deuxième circuit de synthèse numérique directe (50) se trouve au sein d'un circuit de récupération de porteuse (50) situé après le filtre de réception (40) et sert à effectuer un réglage fin de la phase du signal.

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