Efficient spreader for spread spectrum communication systems

Details Efficient spreader for spread spectrum communication systems Efficient spreader for spread spectrum communication systems

H - Electricity

04

B

H04B 1/707 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2401896

A spreading system and method for CDMA applications that requires fewer integer multiplications. User data is spread using real or complex integer based spreading codes of length SF toSFmax chips. At least one of the codes is of the formjn . v[n] where v[n] is a spreading code. The complex rotation of the spreading code decreases the peak-to-average power ratio when the codes are summed up for transmission. The invention provides increased user separation using a plurality of spreading codes.

L'invention concerne un système et un procédé d'étalement destinés à des applications AMCR nécessitant de moins de multiplications entières. Les données de l'utilisateur sont étalées au moyen de codes d'étalement fondés sur des nombres entiers réels ou complexes de longueur comprise entre SF et SF¿max? bribes. Au moins un des codes est sous la forme j?n¿ . v[n], v[n] étant un code d'étalement. La rotation complexe du code d'étalement réduit le rapport puissance de crête/puissance moyenne lorsque les codes sont totalisés pour la transmission. L'invention concerne une séparation d'abonné améliorée au moyen de plusieurs codes d'étalement.

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