Adjusting maximum transmit power to maintain constant margin...

H - Electricity – 04 – B

Patent

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H04B 7/005 (2006.01)

Patent

CA 2376915

A wireless telephone has an output power controller (120) which provides a limit to the maximum transmit power, sufficient to provide adjacent channel power rejection (ACPR). During battery operation, the limit is not fixed. It instead depends on actual transmitted power (114) and (preferably) on temperature (418) and battery voltage (420) as well. Analog signals from detectors for each of these parameters are multiplexed (406), digitized (408), and applied to a microprocessor (410). The microprocessor applies some suitable limiting algorithm, if only an empirically derived look- up table. The resulting signal (430) limits the power control signal (118) received from the base station. If the controller (120) detects (422) that power is being supplied from an external source instead of from a battery, the limiting signal (430) is fixed by the microprocessor (410).

Un téléphone sans fil possède une unité de commande (120) de courant de sortie servant à poser une limite à la puissance maximum d'émission, qui est suffisante pour opérer un rejet de puissance vers une voie contiguë (ACPR). Pendant le fonctionnement de la pile, la limite n'est pas fixée. Elle dépend, au contraire, de la puissance émise réelle (114), ainsi que, de préférence, de la température (418) et de la tension (420) de la pile. Des signaux analogiques provenant de détecteurs pour chacun de ces paramètres sont multiplexés (406), numérisés (408) et appliqués à un microprocesseur (410). Ce microprocesseur applique un algorithme de limitation approprié extrait d'une table de consultation calculée de façon empirique. Le signal obtenu (430) limite le signal (118) de commande de courant reçu depuis la station de base. Si l'unité de commande (120) détecte (422) une alimentation en courant provenant d'une source extérieure plutôt que de la pile, le signal de limitation (430) est fixé par le microprocesseur (410).

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