Ocdma code tracking system having phantom carrier signal

Details Ocdma code tracking system having phantom carrier signal Ocdma code tracking system having phantom carrier signal

H - Electricity

04

B

H04B 7/216 (2006.01) H04B 1/707 (2006.01) H04J 13/02 (2006.01)

Patent

CA 2206819

An OCDMA communication system in which channel signals are bandwidth spread according to a PN code and each channel is identified by a selected one of a set of RW code accesses. The set of RW codes is reduced by a predetermined one (preferably RWo). Each transceiver has acquisition and tracking circuitry which search for a null (e.g., the unsent RW access code) falling lower than a predetermined threshold value and synchronizing tracking on detection of the null.

La présente invention concerne un système de communication AMDC orthogonal dans lequel les signaux canal sont étalés dans la largeur de bande en fonction d'un code de pseudo-bruit, chaque canal étant identifié par code d'accès Rademacher-Walsh (RW) choisi parmi un ensemble de codes Rademacher-Walsh. L'ensemble de codes Rademacher-Walsh est réduit au moyen d'un code Rademacher-Walsh (de préférence RW¿o?).Chaque émetteur-récepteur est doté d'un circuit d'acquisition et de poursuite qui recherche un zéro (par exemple un code d'accès RW non envoyé) tombant en dessous d'une valeur de seuil prédéterminée et permettant de synchroniser la poursuite avec la détection du zéro.

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