Method and apparatus for transmit power modulation in a...

H - Electricity – 04 – B

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H04B 7/06 (2006.01) H04B 7/04 (2006.01)

Patent

CA 2481127

An apparatus according to one embodiment of the invention includes a transmitter. The transmitter comprises a first gain element configured and arranged to modulate a radio-frequency signal according to a first gain factor to produce a first output signal; and a second gain element configured and arranged to modulate the radio-frequency signal according to a second gain factor to produce a second output signal, wherein a magnitude of the first gain factor varies over time, and wherein a magnitude of the second gain factor varies over time with respect ot the magnitude of the first gain factor. Each of the modulated signals is coupled to a respective antenna. The combined radiation pattern of the antennas varies in an angular direction over time. In a system according to one embodiment of the invention, a base station including such an apparatus receives channel quality indications from mobile units and schedules data transmissions to the mobile units accordingly.

Selon un mode de réalisation de l'invention, l'appareil comprend un émetteur. Ledit émetteur comprend un premier élément de gain configuré et conçu pour moduler un signal radiofréquence en fonction d'un premier facteur de gain afin de produire un premier signal de sortie; et un second élément de gain configuré et conçu pour moduler le signal radiofréquence en fonction d'un second facteur de gain afin de produire un second signal de sortie, une amplitude du premier facteur de gain variant dans le temps, et une amplitude du second facteur de gain variant dans le temps par rapport à l'amplitude du premier facteur de gain. Chacun des signaux modulés est couplé à une antenne respective. Le diagramme de rayonnement combiné des antennes varie dans une direction angulaire dans le temps. Dans un système selon un mode de réalisation de l'invention, une station de base comprenant un tel appareil reçoit des indications de qualité de canal provenant d'unités mobiles et programme par conséquent des émissions de données vers les unités mobiles.

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