Channel spreading device and method in cdma communication...

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

H - Electricity

04

J

H04J 11/00 (2006.01) H04Q 7/20 (2006.01) H04B 1/707 (2006.01)

Patent

CA 2316263

A demodulation method in a mobile station having a plurality of channels, for receiving a signal from a base station. In one aspect, the base station has a plurality of channels, a BPSK spreader for orthogonally spreading symbol data of each channel with an assigned orthogonal code, and a QPSK spreader for PN-spreading the orthogonally spread signal with a PN code. In another aspect, the base station has a plurality of channels, a QPSK spreader for spreading symbol data of each channel by the real and imaginary parts of its assigned orthogonal code, and a QPSK spreader for PN-spreading the orthogonally spread signal with a PN code. During the orthogonal despreading, the complex conjugate of the estimated pilot channel value is multiplied by the orthogonally despread signal, for compensation.

L'invention concerne un procédé de démodulation pour station mobile à plusieurs canaux, permettant de recevoir un signal d'une station de base. Dans un mode de réalisation, la station de base comporte plusieurs canaux, un étaleur MDBF permettant d'étaler de manière orthogonale les données de symboles de chaque canal avec un code orthogonal qui lui est affecté, et un étaleur MDPQ permettant un étalement à pseudo-bruit du signal étalé orthogonalement pourvu d'un pseudo-bruit. Dans un autre mode de réalisation, la station de base comporte plusieurs canaux, un étaleur MDPQ permettant d'étaler les données de symboles de chaque canal à l'aide des parties réelle et imaginaire du code orthogonal qui lui est affecté, ainsi qu'un étaleur MDPQ permettant un étalement à pseudo-bruit du signal étalé orthogonalement pourvu d'un pseudo-bruit. Pour compenser, on multiplie, lors du désétalement orthogonal, le conjugué complexe de la valeur estimée du canal pilote par le signal désétalé de manière orthogonale.

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