Method for generating quasi-orthogonal code and spreader...

H - Electricity – 04 – B

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H04B 7/216 (2006.01) H04B 7/26 (2006.01) H04J 11/00 (2006.01) H04B 1/69 (2006.01) H04J 13/02 (2006.01) H04Q 7/36 (2006.01)

Patent

CA 2298690

A device for generating quasi-orthogonal codes which allow the minimum interference with orthogonal codes in a mobile communication system using the orthogonal codes. The device includes a first spreader for spreading at least one input signal with quasi-orthogonal codes, a second spreader for spreading another input signal with Walsh codes, and a PN (Pseudo-Noise) spreader for complex-spreading output signals of the first and second spreaders with PN sequences. The quasi-orthogonal codes are characterized in that a partial correlation value with the Walsh codes does not exceed a lowest partial correlation limit value.

Cette invention concerne un dispositif permettant de générer des codes quasi-orthogonaux qui assurent une interférence minimale avec les codes orthogonaux dans un système de communications mobile utilisant ces derniers. Ce dispositif comprend un premier étaleur qui va étaler au moins un signal d'entrée à l'aide des codes quasi-orthogonaux, un deuxième étaleur qui va étaler un autre signal d'entrée à l'aide de codes de Walsh et, enfin, un étaleur à pseudo-bruit qui va effectuer un étalement complexe des signaux de sortie provenant des premier et second étaleurs à l'aide de séquences de pseudo-bruit. Les codes quasi-orthogonaux se caractérisent en ce que la valeur de corrélation partielle avec les codes de Walsh ne dépasse pas une valeur limite et inférieure de corrélation partielle.

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