Apparatus and method for generating a transition between the...

H - Electricity – 04 – B

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H04B 15/04 (2006.01) H03G 3/20 (2006.01) H04B 1/04 (2006.01) H04B 7/005 (2006.01) H04Q 7/32 (2006.01)

Patent

CA 2087845

An apparatus and method generates a shaped transition between the minimum and maximum output power levels of a transmitter (500). When the transmitter is turned on a stepped transition (415) is generated at the beginning (3) of the transition region (409) followed by a shaped transition (417) to the end (6) of the transition region (409). When the transmitter (500) is turned off a shaped transition region (417') is generated at the beginning (162) of the transition region (411) followed by a stepped transition (415') at the end (3) of the transition region (411). The stepped transition (415 or 415') is generated by adjusting a voltage controlled attenuator (545) and the bias of a power amplifier (545) in the transmitter (500). The shaped transition (417 or 417') is generated by processing transmitted information through finite impulse response filters (507 or 509) before or after the time slot permitted for transmitting information.

L'invention est constituée par un appareil et une méthode produisant une transition modelée entre les niveaux de puissance maximum et minimum d'un émetteur (500). Quand l'émetteur est mis sous tension, une transition en gradins (415) est produite au commencement (3) de la région de transition (409) et est suivie par une transition modelée (417) jusqu'à la fin (6) de la région de transition (409). Quand l'émetteur (500) est mis hors tension, une région de transition modelée (417') est produite au commencement (162) de la région de transmission (411) et est suivie par une transition en gradins (415') à la fin (3) de la région de transition (411). La transition en gradins (415 ou 415') est obtenue en ajustant un atténuateur commandé par la tension (545) et la tension de polarisation d'un amplificateur de puissance (545) faisant partie de l'émetteur (500). La transition modelée (417 ou 417') est obtenue en traitant l'information transmise au moyen de filtres à réponse impulsionnelle finie (507 ou 509) avant ou après la tranche de temps autorisée pour la transmission de l'information.

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