Data demodulator of a receiving apparatus for spread...

H - Electricity – 04 – L

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H04L 7/02 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2099322

A data demodulator of a receiving apparatus for spread spectrum communication for removing the phase difference remaining after detection for improving reception quality. In-phase and quadrature axis received signals are multiplied by pseudonoise codes, PNI(t) and PNQ(t) and the results are averaged aged by averaging sections for calculating the correlation. By performing correlation processing, pkO cos ~ , -pO sin ~, pkO sin ~, and pkO cos ~ are output when the amplitude of receive path signal is assumed to be p, the phase difference to be ~, and a proportional constant to be kO. These signals are multiplied by in-phase and quadrature axis received signals and the results are added by adders, thereby removing the effect of the phase difference ~. The signal is used for data demodulation and data recovery circuit.

L'invention est un démodulateur de données utilisé dans un appareil de réception de communications à spectre étalée pour éliminer le déphasage qui reste après la détection afin d'améliorer la qualité de la réception. Les signaux reçus en phase et en quadrature sont multipliés par des codes de pseudobruit PNI(t) et PNQ(t) et les résultats sont moyennés par des sections de moyennage pour en calculer la corrélation. Le traitement de corrélation donne pkO cos , - pO sin , pkO sin et pkO cos , p étant l'amplitude du signal reçu, le déphasage et kO une constante de proportionnalité. Ces signaux sont multipliés par les signaux reçus en phase et en quadrature et les résultats sont additionnés par des additionneurs, ce qui élimine l'effet du déphasage . Le signal obtenu est utilisé par les signaux de démodulation et d'extraction de données.

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