Direct sequence spread spectrum modulated uplink for...

H - Electricity – 04 – B

Patent

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H04B 7/24 (2006.01) G01S 13/74 (2006.01) G06K 7/00 (2006.01) H04B 1/59 (2006.01) H04B 1/707 (2006.01) H04B 7/22 (2006.01)

Patent

CA 2248507

A modulated backscatter (MBS) system provides a processing gain over MBS background noise by using a wideband uplink signal and a narrowband downlink signal. The wideband uplink signal is generated by controlling the reflection of a narrowband downlink signal using a wideband data signal. The wideband data signal is generated by modulating a pseudo random signal with an information signal, where the chip rate of the pseudo random signal is higher than the bit or symbol rate of the information signal.

L'invention est un système de transmission à rétrodiffusion modulée qui produit un gain de traitement par rapport au bruit de fond de la rétrodiffusion modulée en utilisant un signal à large bande dans la liaison ascendante et un signal à bande étroite dans la liaison descendante. Ce système produit le signal à large bande de la liaison ascendante en contrôlant la réflexion du signal à bande étroite de la liaison descendante au moyen du signal de données à large bande. Il produit ce signal de données à large bande en modulant un signal pseudoaléatoire au moyen d'un signal d'information, le débit des éléments du signal pseudoaléatoire étant plus élevé que le débit des bits ou des symboles dans le signal d'information.

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