Transmit antenna diversity apparatus and method for a base...

H - Electricity – 04 – B

Patent

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H04B 7/02 (2006.01) H04B 7/06 (2006.01) H04J 11/00 (2006.01) H04B 1/69 (2006.01) H04B 1/707 (2006.01) H04Q 7/30 (2006.01)

Patent

CA 2407560

Disclosed is a base station transmission apparatus in a mobile communication system using transmit antenna diversity. A modulator generates a complex symbol in response to a coded symbol. A first spreader generates a plurality of different complex symbols in response to the complex symbol, and generates a plurality of first spread complex symbols by spreading the generated complex symbols with a first orthogonal code. A second spreader generates a plurality of same complex symbols in response to the complex symbol from the modulator, spreads the same complex symbols with a second orthogonal code, and generates a plurality of second spread complex symbols by multiplying the spread complex symbols by weights based on feedback information. A summer sums up the first complex symbols and the second complex symbols.

L'invention concerne un dispositif d'émission de station de base d'un système de communication mobile faisant appel à une diversité d'antennes émettrices. Un modulateur génère un symbole complexe en réponse à un symbole codé. Une première unité d'étalement génère une pluralité de symboles complexes différents en réponse à ce symbole complexe et génère une pluralité de premiers symboles complexes par l'étalement des symboles complexes au moyen d'un premier code orthogonal. Une seconde unité d'étalement génère une pluralité de symboles complexes similaires en réponse au symbole complexe du modulateur, étale ces symboles complexes similaires au moyen d'un second code orthogonal et génère une pluralité de seconds symboles complexes étalés par la multiplication des symboles complexes étalés avec des coefficients de pondération déterminés en fonction du retour d'information. Un totaliseur additionne les premiers symboles complexes et les seconds symboles complexes.

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