Method and system for locating a mobile subscriber in a cdma...

Details Method and system for locating a mobile subscriber in a cdma... Method and system for locating a mobile subscriber in a cdma...

H - Electricity

04

Q

H04Q 7/38 (2006.01)

Patent

CA 2367572

The invention determines the geographic location of a subscriber unit within a CDMA communication system. At least one base station transmits a spread spectrum signal with a chip code sequence unique to that base station. A subscriber unit receives the base station signal and transmits a spread spectrum signal wiht a unique chip code sequence time synchronized with the chip code sequence of the received base station signal. The base station receives the subscriber unit signal and compares the chip code sequence of the received subscriber unit singal with the chip code sequence signal transmitted by the base station to determine the location of the subscriber unit.

L'invention détermine l'emplacement géographique d'une unité d'abonné à l'intérieur d'un système de télécommunications AMDC. Au moins une station de base transmet un signal à spectre étalé ayant une séquence de code de puce unique à cette station de base. Une unité d'abonné reçoit le signal de la station de base et transmet un signal à spectre étalé ayant un temps de séquence de code de puce unique synchronisé avec la séquence de code de puce du signal de la station de base reçu. La station de base reçoit le signal de l'unité d'abonné et compare la séquence de code de puce du signal de l'unité d'abonné reçu au signal de séquence de code de puce transmis par la station de base pour déterminer l'emplacement de l'unité d'abonné.

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