Reception diversity combiner with selectable inversion and...

H - Electricity – 04 – B

Patent

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H04B 7/08 (2006.01)

Patent

CA 2455111

A combiner for a diversity radio receiver wherein amplitude inversion of either received signal is performed, on a selection basis, in order to maximize the resultant output combined signal. The strength of each diversity signal is monitored as well as the strength of the combined output signal. A gain control engine combines the stronger signal with either the inverted or non-inverted weaker signal to maximize the combined output (resultant) signal strength. According to another embodiment the combiner may additionally perform an amplitude adjustment whereby the in-channel noise power is also monitored and the individual channel signal-to-noise ratios are used to adjust the amplifier gains. In this embodiment the individual channel signal-to-noise ratios plus the strength of the combined output signal are used to decide whether to invert the weaker signal before combining the received signals.

La présente invention concerne un récepteur radio en diversité dans lequel l'inversion d'amplitude des signaux reçus est effectuée sur une base sélective afin de maximiser le signal de sortie combiné obtenu. Selon l'invention, on surveille l'intensité de chaque signal de diversité et l'intensité du signal de sortie combiné. Un moteur de commande de gain combine le signal le plus fort avec le signal le plus faible inversé ou non inversé afin de maximiser l'intensité du signal de sortie (obtenu). Dans un autre mode réalisation, le mélangeur peut en outre effectuer un ajustement d'amplitude qui permet de surveiller également la puissance du bruit dans la voie et on utilise les rapports signal-bruit pour ajuster les gains de l'amplificateur. Dans ce mode de réalisation, on utilise les rapports signal-bruit individuels plus l'intensité du signal de sortie combiné pour décider d'inverser ou non le signal le plus faible avant de combiner les signaux reçus.

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