Kronecker product code acquisition system

H - Electricity – 03 – D

Patent

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H03D 11/00 (2006.01) H04L 7/00 (2006.01) H04L 7/04 (2006.01) H04L 27/06 (2006.01)

Patent

CA 2268854

A Kronecker product code structure for a synchronization word is presented which permits the use of dual-mode sequential matched filter. This matched filter permits a large reduction in acquisition time since the number of frequency bins that must be searched is greatly reduced when there is a large frequency uncertainty. In the first mode of operation the output of a filter matched to the high rate code is non-coherently integrated in a post-detection integrator to obtain reliable but ambiguous acquisition of the synchronization word. In the second mode of operation the ambiguity is resolved.

La présente invention concerne une structure de code à produit tensoriel de Kronecker pour mot de synchronisation, laquelle structure permet d'employer un filtre accordé séquentiel bi-mode. Ce filtre accordé permet de réduire considérablement les délais d'acquisition, étant donné que le nombre de fenêtres de fréquences à analyser est fortement réduit en cas de grande incertitude sur les fréquences. Avec le premier mode de fonctionnement, la sortie d'un filtre accordé sur le code à débit élevé n'est pas intégrée au niveau d'un intégrateur à post-détection en vue de l'obtention d'une acquisition fiable mais ambiguë du mot de synchronisation, alors qu'avec le second mode de fonctionnement, l'ambiguïté est levée.

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