Cartesian loop systems with digital processing

H - Electricity – 04 – B

Patent

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Details

H04B 1/12 (2006.01) H03F 1/32 (2006.01) H03G 3/30 (2006.01) H04B 1/40 (2006.01) H04B 7/00 (2006.01) H04B 1/04 (2006.01)

Patent

CA 2439018

A Cartesian loop system for radio transmitters in which at least part of the baseband processing is carried out in the digital domain. Digital processing circuitry (250) combines a baseband input signal with a Cartesian feedback signal (206, 207) to generate a forward signal. Analog circuitry (221, 201, 203, 204) converts the forward signal into a transmission output signal and generates the Cartesian feedback signal. Preferably the digital processing circuitry applies a phase shift process (208) to the Cartesian feedback signal before combination with the baseband input signal. The system is programmable allowing a single device to be used in a range of transmitters under different radio standards.

La présente invention concerne un système de boucle cartésienne pour des radioémetteurs dans lesquels au moins une partie du traitement de la bande de base est effectuée en dehors du domaine numérique. Un ensemble de circuits (250) de traitement numérique combine un signal d'entrée de bande de base et un signal de rétroaction cartésienne (206, 207) pour générer un signal vers l'avant. Un ensemble de circuits analogiques (221, 201, 203, 204) convertit le signal vers l'avant en un signal de sortie d'émission et génère le signal de rétroaction cartésienne. De préférence, l'ensemble de circuits de traitement numérique applique un processus (208) de décalage de phase au signal de rétroaction cartésienne avant la combinaison avec le signal d'entrée de bande de base. Ce système est programmable et permet d'utiliser un dispositif unique dans une pluralité d'émetteurs soumis à des normes radioélectriques différentes.

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