Method and system for determining the position of a mobile...

H - Electricity – 04 – B

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H04B 1/707 (2006.01) H04Q 7/38 (2006.01)

Patent

CA 2327647

A method and system are disclosed for determining the position of mobile stations (120) in a CDMA cellular system, in which each symbol (S1) to be transmitted by a mobile station (120) is first spread by a short code, and the resulting signal is further spread by a long code. The spreading code (C1) is divided into N-chip sections. Consequently, even if the transmitted symbols are unknown, the N-chip sections of the resulting signal are known (at least to within an unknown phase difference). The mobile station (120) then transmits the resulting spread signal. At the receiving base station, the received spread signal is correlated (and despread) with the known codes, and the original data is reconstructed. As such, the timing of the received signal can be determined with an accuracy of at least the time interval of the unknown phase difference.

L'invention concerne un procédé et un système permettant de déterminer la position de stations mobiles (120) dans un système cellulaire AMCR, chaque symbole (S¿1?) à transmettre à une station mobile (120) étant d'abord étalé par un code court, et le signal résultant étant ensuite étalé par un code long. Le code d'étalement (C¿1?) est divisé en sections de N puces. En conséquence, même si les symboles transmis sont inconnus, les sections de N puces du signal résultant sont connues (au moins dans une différence de phase inconnue). La station mobile transmet, ensuite, le signal résultant étalé. Au niveau de la base de réception, le signal étalé reçu est corrélé (et désétalé) avec les codes connus, et les données originales sont reconstruites. La synchronisation du signal reçu peut ainsi être déterminée avec une précision correspondant au moins à l'intervalle de temps de la différence de phase inconnue.

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