A method for assigning spreading codes

H - Electricity – 04 – B

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H04B 7/26 (2006.01) H04J 11/00 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2299297

The present invention relates to methods for assigning spreading codes to forward-link connections with variable bit-rate in DS-CDMA communication systems. A first connection is assigned a first number of codes (x) from a first set (S1) of orthogonal codes. A second connection is assigned a second number of codes (y). A first part (y-k1) of the second number of codes (y) is taken from the first set (S1) of orthogonal codes. A second part (k1) of the second number of codes (y) is taken from a second set (S2) of orthogonal codes which is non-orthogonal to the first set (S1).

Cette invention se rapporte à des procédés servant à attribuer des codes d'étalement à des connexions de liaison aval avec des débits binaires variables dans des systèmes de communication DS-CDMA. A une première connexion est attribué un premier nombre de codes (x) pris dans un premier ensemble (S1) de codes orthogonaux. A une seconde connexion est attribué un second nombre de codes (y). Une première partie (y-k¿1?) du second nombre de codes (y) est prélevée dans le premier ensemble (S1) de codes orthogonaux. Une seconde partie (k¿1?) du second nombre de codes (y) est prélevée dans un second ensemble (S2) de codes orthogonaux, qui n'est pas orthogonal par rapport au premier ensemble (S1).

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