System and method of estimating earliest arrival of cdma...

H - Electricity – 04 – W

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H04W 64/00 (2009.01) H04W 24/00 (2009.01) G01S 5/10 (2006.01)

Patent

CA 2455704

A system and method for estimating the earliest signal arrival in a wireless communication system, is presented herein. In accordance with an embodiment of the invention, the system includes a base station that transmits a plurality of pilot signals and a mobile station configured to receive a plurality of signals corresponding to one of the transmitted pilot signals. The mobile station includes a receiver containing a searcher correlating mechanism and at least one finger correlating mechanism. The mobile station receiver detects the arrival times and energy levels of the received signals and constructs a searcher histogram and a finger histogram representing an arrival time distribution of samples corresponding to the received signals. The mobile station then generates a delay index for each of the estimated early signal arrivals and forwards the delay indices to the base station or a position determination entity to select the minimum delay index corresponding to the earliest signal arrival.

L'invention concerne un système et un procédé permettant d'estimer l'arrivée au plus tôt d'un signal dans un système de communication sans fil. Dans un mode de réalisation de cette invention, le système comprend une station de base qui transmet une pluralité de signaux pilotes et une station mobile conçue pour recevoir une pluralité de signaux correspondant à un des signaux pilotes transmis. La station mobile comprend un récepteur contenant un mécanisme de corrélation des dispositifs de recherche et au moins un mécanisme de corrélation des doigts. Le récepteur de la station mobile détecte les temps d'arrivée et les niveaux d'énergie des signaux reçus et construit un histogramme associé aux dispositifs de recherche et un histogramme associé aux doigts représentant une distribution de temps d'arrivée des échantillons correspondant aux signaux reçus. La station mobile génère ensuite un indice de retard en direction de la station de base ou d'une entité de détermination de position pour choisir l'indice de retard minimum correspondant à l'arrivée de signal au plus tôt.

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