Methods and apparatus for high data rate transmission in...

H - Electricity – 04 – B

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H04B 7/04 (2006.01) H04B 7/06 (2006.01) H04B 7/08 (2006.01)

Patent

CA 2199542

An adaptive high speed data transmission system is described. In one aspect, the transmitter for this system employs a plurality of transmit antennas which have controllable offsets. The tranmsitter also includes signal coding circuitry suitable for use to address transmission impairments due to fast fading in the transmission channel. At the receiver, the received signal is analyzed to determine the fading characteristics of the channel. Where slow fading is detected, the offsets are employed to convert the slow fading into fast fading. The channel characteristics are continually resampled and these characteristics are used to adjust the transmitter and the receiver to achieve optimal transmission speed.

L'invention est un système adaptatif de transmission de données à grand débit. Dans l'une des concrétisations de l'invention, l'émetteur du système utilise une pluralité d'antennes d'émission à décalages contrôlables. L'émetteur comporte également un circuit de codage de signaux servant à prendre en charge les déficiences dans la transmission des adresses résultant des évanouissements rapides dans le canal de transmission. Au récepteur, le signal reçu est analysé pour déterminer les caractéristiques d'évanouissement du canal. Quand un évanouissement lent est détecté, les décalages sont utilisés pour convertir cet évanouissement lent en un évanouissement rapide. Les caractéristiques du canal sont échantillonnés de façon continue et sont utilisées pour ajuster l'émetteur et le récepteur de façon à optimiser le débit de transmission.

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