Method and apparatus for performing code acquisition in a...

H - Electricity – 04 – B

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H04B 1/707 (2006.01)

Patent

CA 2172370

A novel and improved method of acquisition in a spread spectrum communication system is presented. In the present invention, a large window of PN chip offset hypotheses are searched which are generated by a PN sequence generator (20) under the control of a searcher controller (18). The energy of the despread sequence which is despread by a despreader (6) is found that might indicate the presence of the pilot signal in a threshold comparer (16) having one of the chip offsets of the large search window, then a search of a subset of offset hypotheses, or small window, is searched under the control of searcher controller (18).

On décrit un nouveau procédé d'acquisition amélioré dans un système de communication à spectre étalé. Dans la présente invention, on recherche une large fenêtre d'hypothèses de décalage des bits de bruit pseudo-aléatoire produits par un générateur (20) de séquences de bruit pseudo-aléatoire sous le contrôle d'une commande de recherche (18). On détermine l'énergie de la séquence à annulation d'étalement par un dispositif d'annulation d'étalement (6), qui pourrait indiquer la présence du signal pilote dans un comparateur de seuil (16) ayant un des décalages de bits de la large fenêtre de recherche, après quoi on effectue une recherche sur un sous-ensemble d'hypothèses de décalage (petite fenêtre), sous le contrôle de la commande de recherche (18).

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