Phase modulator for digital data transmission - uses N different phase states of carrier signal to represent corresponding number of logic words

The phase modulator for the transmission of digital signals has n phase states corresponding to n distinct logic words. The modulator receives a carrier frequency F, and generates n signals of the same frequency F having phases of no2 pi/n where no takes the values 1, 2 ...n. A logic multiplexer com...

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Bibliographic Details
Main Author JEAN-FRANCOIS CORNET
Format Patent
LanguageEnglish
French
Published 18.05.1979
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Summary:The phase modulator for the transmission of digital signals has n phase states corresponding to n distinct logic words. The modulator receives a carrier frequency F, and generates n signals of the same frequency F having phases of no2 pi/n where no takes the values 1, 2 ...n. A logic multiplexer comprises n inputs to which these signals are applied for transmission of a digitally encoded message using n words. A clock controls operation of the system using a frequency of nF. L'invention concerne les modulateurs de phase recevant des signaux numériques. Le modulateur de phase selon l'invention comporte un générateur logique de signaux porteurs décalés en phase, égaux en nombre à celui des états de phase souhaités, et un multiplexeur logique de ces signaux dans le temps en fonction des mots d'information logiques à transmettre qui en constituent l'adresse. Application aux systèmes de transmission exploités sur des fréquences porteuses pouvant être rapidement variables.
Bibliography:Application Number: FR19770031276