Channel spreading device and method for cdma communication...

Details Channel spreading device and method for cdma communication... Channel spreading device and method for cdma communication...

H - Electricity

04

B

H04B 7/216 (2006.01) H04B 7/26 (2006.01) H04L 27/22 (2006.01) H04J 11/00 (2006.01) H04J 13/02 (2006.01) H04B 1/69 (2006.01) H04Q 7/30 (2006.01) H04Q 7/32 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2349222

A channel spreading device for a base station in a CDMA communication system is described. The device comprises a spreading code generator (911, 913) for generating a real-component spreading code and an imaginary-component spreading code corresponding to a designated channel spreading code index; a circuit receiving a mode control signal, for disabling generating of the imaginary-component spreading code when the received mode control signal indicates a BPSK (Binary Phase Shift Keying) modulation mode; and a complex multiplier (915, 917, 919, 921) receiving a channel signal, for complex multiplying the received channel signal by the spreading codes to spread the channel signal.

L'invention concerne un dispositif d'étalement de voie destiné à une station de base d'un système de communication à accès multiple par code de répartition (AMCR). Ce dispositif comprend un générateur de code d'étalement (911, 913), servant à produire un code d'étalement à composants réels et un code d'étalement à composants imaginaires correspondants à un index de codes d'étalement de voie désigné. L'invention concerne également un circuit de réception d'un signal de commande de mode, destiné à invalider la production du code d'étalement à composants imaginaires lorsque le signal de commande de mode reçu indique un mode de modulation par déplacement binaire de phase ; elle concerne enfin un multiplicateur complexe (915, 917, 919, 921), recevant un signal de voie, et destiné à multiplier de manière complexe le signal de voie reçu par les codes d'étalement, aux fins d'étalement dudit signal.

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