H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/22 (2006.01) H04L 27/227 (2006.01) H04L 27/00 (2006.01)
Patent
CA 2165456
A carrier wave phase-modulated signal having 2M states, M being an integer, is demodulated by converting it into a quadrature two-way baseband signal by multiplying it by a local osciallator signal (20) at the translated carrier frequency, and digitising the baseband signal by sampling it at the modulating signal clock frequency. The signal clock is recovered by setting the phase of a bit frequency stabilised local clock (32) and seeking the minimum inter-symbol interference before recovering the carrier.
Pour démoduler un signal à modulation de phases à 2M états d'une porteuse, M étant un nombre entier, on convertit le signal en bande de base sur deux voies en quadrature par multiplication par unsignal d'oscillateur local (20) à la fréquence de porteuse transposée et on numérise le signal en bande de base par échantillonnage à la fréquence d'horloge du signal modulant. On récupère l'horloge du signal par calage de la phase d'une horloge locale (32) stabilisée à la fréquence de bit, par recherche du minimum d'interférence intersymbole, et cela avant récupération de la porteuse.
Goudreau Gage Dubuc
Matra Communication
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