Gmsk modulator

H - Electricity – 03 – C

Patent

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Details

H03C 3/00 (2006.01) H04L 27/12 (2006.01) H04L 27/20 (2006.01)

Patent

CA 2208094

A Gaussian Minimum Shift Keying modulator that provides direct modulation of a carrier signal, produced by a single microwave high power voltage controlled oscillator. A continuous phase frequency shift keyed modulated signal with a modulation index of 0.5 is produced at the desired output frequency using a full 360 degree linear continuous phase modulator, controlled by a linear baseband signal that is the integral of the binary baseband information signal. This modulated signal is used as the reference signal for a phase locked high power voltage controlled oscillator. The phase locked loop provides frequency tracking and Gaussian spectral shaping to the modulated output signal.

Modulateur MDMG (modulation par déphasage minimal avec filtrage gaussien) modulant directement une porteuse produite par un unique oscillateur commandé par tension à grande puissance hyperfréquence. Un signal modulé par déplacement de fréquence à variation continue de phase, ayant un indice de modulation de 0,5, est produit à la fréquence de sortie désirée au moyen d'un modulateur de phase continue linéaire à 360 degrés, commandé par un signal de bande de base linéaire intégrant le signal binaire d'information de bande de base. Ce signal modulé est utilité comme signal de référence pour un oscillateur commandé par tension à grande puissance à phase asservie. La boucle à phase asservie permet le suivi de fréquence et la conformation spectrale gaussienne du signal de sortie modulé.

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