A transmission apparatus capable of attenuating a peak power...

H - Electricity – 04 – L

Patent

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Details

H04L 5/06 (2006.01) H04L 27/26 (2006.01) H04L 5/02 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2294140

Signals subjected to orthogonal modulation with a plurality of carrier frequencies are added to detect peak power. Based on the peak power, a coefficient for suppressing an amplitude of a transmission baseband signal is calculated. Using the coefficient, the amplitude of a baseband signal to be inputted to a filter is suppressed. It is thereby possible to suppress the peak power assuredly, and by the effects of the filter, unnecessary frequencies are not generated.

Selon cette invention, on réalise la modulation en quadrature à l'aide d'une pluralité de fréquences porteuses, on totalise les signaux et on détecte la puissance de crête des signaux. Un coefficient de suppression de l'amplitude du signal de transmission en bande de base est calculé sur la base de la puissance de crête des signaux détectée. Ce coefficient est utilisé pour supprimer l'amplitude du signal en bande de base introduit dans un filtre limiteur de la largeur de bande. En conséquence, la puissance de crête du signal peut être incontestablement supprimée, et le filtre limiteur de la largeur de bande empêche efficacement la génération de fréquences indésirables.

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