Transmitter circuit architecture for reducing in-band noise...

H - Electricity – 01 – Q

Patent

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Details

H01Q 11/12 (2006.01) H04B 1/04 (2006.01) H04B 7/005 (2006.01)

Patent

CA 2452267

A novel wireless point to multipoint communication system which maximizes the number of remote stations (11, 14) capable of communicating with a base station (10) is disclosed. Independent gain control of the transmitter on the remote stations (11, 14) as a function of the distance between the remote station and the base station (10) is used. The gain control may be accomplished by attenuators (22A-22B) in the RF transmit circuit of the remote stations. The attenuators (22A-22B) may be placed immediately preceding the RF amplifiers (30) in the RF transmit circuit of the remote stations. The amount of attenuation of the attenuators may be controlled by a microprocessor (24). By minimizing the gain from the remote station transmitters, the noise floor of the base station receiver is minimized thereby increasing the performance of the base station receiver. This increase in performance permits more remote stations to communicate with the base station.

L'invention concerne un nouveau système de communication point à multipoint sans fil permettant de porter au maximum le nombre de stations distantes pouvant communiquer avec une station de base. Ce système est conçu pour commander de manière indépendante le gain de l'émetteur situé dans les stations distantes en fonction de la distance séparant la station distante de la station de base. La commande du gain peut être effectuée par des affaiblisseurs faisant partie du circuit de transmission RF des stations distantes. Ces affaiblisseurs peuvent être disposés juste en amont des amplificateurs RF dans le circuit de transmission RF des stations distantes. La quantité d'affaiblissement réalisée par les affaiblisseurs peut être commandée par un microprocesseur. La minimalisation du gain des émetteurs situés dans les stations distantes permet de minimaliser le bruit de fond du récepteur de la station de base et ainsi d'accroître la performance de ce dernier. Grâce à cette augmentation de performance, plus de stations distantes peuvent communiquer avec la station de base.

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