Radio positioning system wit interference reduction

H - Electricity – 04 – B

Patent

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Details

H04B 1/707 (2006.01) G01S 5/02 (2006.01)

Patent

CA 2489728

The present invention sets out to overcome the hearability problem in CDMA communications networks in which positioning services are provided, by using a separate sampling device (204, 205, 206) for each transmitter (201, 202, 203), which sends to the computing device (208) a representation of the signals transmitted only by that transmitter. A cross-correlation of the representation sent back by the mobile terminal (207) with the representation sent back by the sampling device in the brightest transmitter is performed in the computing device (208), and a blurred estimate of that brightest signal is subtracted from a blurred version of the representation sent back by the mobile terminal (207) in order to reduce its effect on the remaining signals as far as possible. The cross-correlation and subtraction steps are iterated until no useful signals remain to be extracted.

L'invention vise à résoudre le problème d'audibilité dans des réseaux de communication AMRC qui disposent de services de positionnement par l'utilisation d'un dispositif d'échantillonnage distinct (204, 205, 206) pour chaque émetteur (201, 202, 203), qui envoie au dispositif informatique (208) une représentation des signaux transmis uniquement par cet émetteur. On effectue, dans le dispositif informatique (208), une corrélation croisée de la représentation renvoyée par le terminal mobile (207) avec la représentation renvoyée par le dispositif d'échantillonnage dans l'émetteur le plus clair, puis on soustrait une estimation floue du signal le plus clair d'une version floue de la représentation renvoyée par le terminal mobile (207) afin de réduire son effet sur les signaux restants autant que possible. On répète les étapes de corrélation croisée et de soustraction jusqu'à ce qu'il ne reste aucun signal utile à extraire.

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