Cdma communication system

H - Electricity – 04 – B

Patent

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Details

H04B 1/69 (2006.01) H04B 7/216 (2006.01) H04B 7/26 (2006.01) H04J 13/02 (2006.01)

Patent

CA 2213625

In a CDMA communication system, a base station includes a spreader 11 for spreading a frequency of a standby control signal by using a short code, a differential coder 12 for differential-coding the spread standby control signal and adders 13a and 13b for adding the differential-coded signal to an I channel signal and a Q channel signal, respectively, and a terminal station includes a differencial detector 14 for differencial-detecting a receiving signal and a matched filter 15 for inverse-spreading a differencial-detected baseband signal, wherein a complete intermittent operation of the terminal station in a standby state is realized and a power consumption of the terminal station is reduced by transmitting the standby control signal containing an information indicative of the terminal station and an intermittent interval from the base station to the terminal station.

Dans le système de communication AMDC de l'invention, une station de base comprend un dispositif 11 servant à étaler la fréquence d'un signal de commande de mise en attente au moyen d'un code court, un codeur différentiel 12 servant à coder ce signal de commande de mise en attente étalé et des additionneurs 13a et 13b servant à ajouter le signal codé au signal d'un canal I et au signal d'un canal Q respectivement, et une station terminale comprend un détecteur différentiel 14 servant à détecter les signaux reçus et un filtre adapté (15) servant à inverser l'étalement d'un signal de bande de base détecté. Un fonctionnement intermittent de la station terminale dans un état d'attente est réalisé et la consommation d'énergie de la station terminale est réduite par la transmission d'un signal de contrôle de mise en attente contenant une information indiquant la situation de la station terminale et l'intermittence des opérations entre la station de base et la station terminale.

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