Transmitting digital data using multiple subcarriers

H - Electricity – 04 – Q

Patent

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H04Q 7/08 (2006.01) H04H 1/00 (2006.01)

Patent

CA 2202044

Two separate subcarriers (16, 22) are used to transmit portions of a single message to one or more receivers on an FM radio signal. The synchronization and addressing data necessary to identify the message to a target receiver is located in the first subcarrier. The second subcarrier, in turn, consists almost entirely of raw message data. Thus, transmitting multiple subcarriers substantially increases the overall data transmission payload when transmitting digital messages. Because each subcarrier is located within a different frequency band, the communication system is also adaptable to different subcarrier allotments in the FM baseband.

On utilise deux sous-porteuses séparées (16, 22) pour transmettre des parties d'un message unique vers un ou plusieurs récepteurs par un signal radio à modulation de fréquence. Les données de synchronisation et d'addressage nécessaires pour permettre l'identification du message par un récepteur cible se trouvent dans la première sous-porteuse. La seconde sous-porteuse est, quant à elle, constituée presque exclusivement de messages bruts. Ainsi, en transmettant les sous-porteuses multiples, on augmente sensiblement la charge de transmission de données globale lors de la transmission de messages numériques. Comme chaque sous-porteuse se trouve dans une bande de fréquence différente, ce système de communication peut également s'adapter à des attributions différentes des sous-porteuses dans la bande de base de la modulation de fréquence.

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