Multi-layered pn code spreading in a multi-user...

H - Electricity – 04 – B

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H04B 1/69 (2011.01) H04B 7/216 (2006.01)

Patent

CA 2305718

A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread information signals along with a second PN spreading code sequence or function. The second PN code is synchronized with the first PN spreading code, but has a larger code period so that each code chip of the second PN code extends over the entire period of the first PN code. The longer period spreading code forms an outer code which helps provide unambiguous beam identification and easily acquired frame timing in the presence of dynamically changing signal path delay, improving signal acquisition.

L'invention concerne une technique d'étalement de signaux d'information dans un système de communications à spectre étalé permettant d'obtenir une plus grande vitesse d'acquisition du signal. On utilise un premier code ou ensemble de codes d'étalement de pseudo-bruit pour étaler des signaux d'information, ainsi qu'une seconde séquence ou fonction de code d'étalement de pseudo-bruit. Le second code de pseudo-bruit est synchronisé avec le premier code d'étalement de pseudo-bruit, mais présente une période de code plus grande, de sorte que chaque élément de code du second code de pseudo-bruit s'étend sur toute la période du premier code de pseudo-bruit. Le code d'étalement possédant la période la plus longue forme un code extérieur qui facilite l'obtention d'une identification de faisceau non ambiguë et une synchronisation de trame aisément acquise en cas de retard de parcours du signal à changement dynamique, ce qui améliore l'acquisition du signal.

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