Brevet : EP1243077 - MAINTIEN DE LA QUALITE DE RENDEMENT D'UN SYSTEME A LARGE BANDE EN PRESENCE DE S...

Titre

MAINTIEN DE LA QUALITE DE RENDEMENT D'UN SYSTEME A LARGE BANDE EN PRESENCE DE SIGNAUX BROUILLEURS A BANDE ETROITE

N° et date de publication de la demande

EP1243077 - 25/09/2002

Type de la demande

A1

N° et date de dépôt

EP00902521.4 - 02/02/2000

N° et date de priorité

CA2260653 - 02/02/1999

Famille de brevets

ATE518311T1 ; AU2426800A ; CA2260653A1 ; WO0046929A1 ; JP2002536905A ; ES2369974T3 ; EP1243077A1 ; KR20020001729A ; CA2342402A1 ; CN1339198A ; HK1046337A1

Abrégé

A method and device which dynamically detects, tracks and filters interfering signals with sufficient speed (i.e. within one IS-95 CDMA data frame period, or 20ms) and fidelity to eliminate or greatly reduce the deleterious effects of narrow band interferor signals on a CDMA link. When inserted in an RF signal path an Adaptive Notch Filter (ANF) detects narrow band interferors above a threshold level within the CDMA signal. Detection is accomplished by continuous scanning of a preset excision band, e.g. a specified narrow band associated with an AMPS system. Detected interferors are then automatically acquired and suppressed. This is achieved by electronically placing a rejection notch at the frequency of the interferors. Multiple notch filters may be used to simultaneously suppress multiple interferors. In the absence of interferors a bypass mode is selected allowing the RF signal to bypass the notch. Upon detection of an interferor, a switch is made to a suppression mode where the interferor is steered through a first notch section and suppressed. Alternatively, an external control line may be used to select the bypass mode so that the signal is allowed to pass the notch section, regardless of interferor content.