Discrimination procedure of a wanted signal from a plurality...

H - Electricity – 01 – Q

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H01Q 3/26 (2006.01)

Patent

CA 2314364

It is described a discrimination procedure of a wanted signal from a plurality of cochannel interferents received by array antennas of GSM or DCS base transceiver stations. The procedure includes a phase for the estimate of the number and arrival directions of the interferents, and of the wanted signal, followed by a spatial filtering phase in which the signals transduced by the sensors of the array are linearly combined among them through multiplication coefficients, or weights, organized in a vector w satisfying the two following conditions: A) Spatial filtering constrains the gain of the array in the ratio between wanted signal and noise, compared to the traditional use of a single sensor, so that the gain is not less than a properly selected threshold; B) it minimizes the ratio between the sum of interferents' powers and wanted signal power.

La présente invention concerne un procédé de discrimination d'un signal désiré parmi une pluralité de signaux d'interférence entre voies, reçus par les antennes réseau de stations de base d'émission-réception GSM ou DCS. Le procédé comprend une phase d'estimation des directions d'arrivée et du nombre des signaux d'interférence ainsi que du signal désiré, suivie par une phase de filtrage spatial dans laquelle les signaux convertis par les capteurs du réseau sont combinés linéairement entre eux en poids ou à l'aide de coefficients en un vecteur w qui remplit les deux conditions suivantes: A) en comparaison de l'usage classique d'un seul capteur, le filtrage spatial force le gain du réseau, dans le rapport signal désiré sur bruit, de manière à ce qu'il n'ait pas une valeur inférieure à un seuil soigneusement prédéterminé; B) il minimise le rapport entre la somme des puissances des signaux d'interférence et la puissance du signal désiré.

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