Carrier regenerating circuit, multi-level quadrature...

H - Electricity – 04 – L

Patent

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H04L 27/38 (2006.01)

Patent

CA 2220417

Level-holding circuits 16, 17 sample and hold the output of quadrature detecting circuit 11 at adjoining apertures of eye patterns of demodulated multi-level QAM signal components and at the middle point of the adjoining apertures, respectively. Thus, location information on a phase plane of demodulated signal such as (I0, Q0), (I1, Q1), and (I1/2, Q1/2) are obtained. Frequency deviation detecting circuit 18 calculates the amplitude and the direction of the frequency deviation of regenerated carrier based on the location information. The output of frequency deviation detecting circuit 18 is added to phase error signal in synthesizing circuit 20. The result of addition is applied to VCO 15.

L'invention est constituée par des circuits de maintien de niveau 16, 17 qui échantillonnent et bloquent le signal de sortie d'un circuit de détection 11 aux ouvertures adjacentes des diagrammes en oeil des composantes d'un signal à amplitude modulée en quadrature multiniveau démodulé et au point milieu des ouvertures adjacentes, respectivement. On obtient ainsi une information de localisation dans le plan de phase du signal démodulé telle que (I0,Q0), (I1,Q1) et (I1/2,Q1/2). Un circuit de détection de déviations de fréquence 18 calcule l'amplitude et le sens de la déviation de fréquence de la porteuse régénérée en se basant sur cette information de localisation. Le signal de sortie du circuit de détection de déviations de fréquence 18 est additionné avec le signal d'erreur de phase dans un circuit synthétiseur 20 et le résultat de cette addition est transmis à un oscillateur commandé par la tension 15.

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