Fast acquisition of a pilot signal in a wireless...

H - Electricity – 04 – B

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H04B 1/707 (2006.01)

Patent

CA 2404520

In a remote unit (39) of a wireless communication system, the speed of acquisition, or reacquisition, of a pilot signal by a search engine (47) is increased. PN space is divided into segments and a coarse search of each segment is performed using a set of "fast" search parameters. A set of peak signal strengths, along with their corresponding PN offsets, is saved to memory (49) for each segment of PN space. Following the search of all segments of PN space, the peak signal strengths which were saved during the coarse acquisition are evaluated by a controller (50). Coarse acquisition search results are used by the remote unit (39) to determine fine search window parameters for subsequent searches performed by the remote unit (39) search engine (44). The fine search parameters concentrate searching efforts of the remote unit (39) search engine (44) on portions of PN space most likely to contain a viable base station pilot signal.

Dans une unité distante (39) d'un système de communication sans fil, on arrive à augmenter la vitesse d'acquisition ou de réacquisition d'un signal pilote au moyen d'un moteur de recherche (47). L'espace PB (pseudo-bruit) est divisé en segments, et l'on effectue une recherche grossière de chaque segment en utilisant un ensemble de paramètres de recherche "rapides". Un ensemble d'intensités de crête du signal, conjointement avec leur décalage PB, est sauvegardé dans une mémoire (49) pour chaque segment de l'espace PB. Après la recherche de chacun des segments de l'espace PB, les intensités de crête des signaux qui ont été sauvegardées lors de l'acquisition grossière sont évaluées par un contrôleur (50). Les résultats de recherche d'acquisition grossière sont utilisés par l'unité distante (39) afin de déterminer des paramètres de recherche de précision pour les recherches subséquentes effectuées par le moteur de recherche (44) de l'unité distante (39). Les paramètres de recherche fine concentrent les efforts de recherche du moteur de recherche (44) de l'unité distante (39) sur les parties de l'espace PB qui contiennent le plus probablement un signal pilote viable de station de base.

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