Spread-response precoding system for wireless transmission

Details Spread-response precoding system for wireless transmission Spread-response precoding system for wireless transmission

H - Electricity

03

M

H03M 7/00 (2006.01) H04B 7/02 (2006.01) H04B 7/216 (2006.01) H04L 1/00 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2156757

Method and apparatus for preparing a message stream of symbols for wireless transmission by pre-coding it through convolution with a characteristic "signature" of predetermined symbols identifying a particular user of the message system. The time duration of the signature should exceed the inter-symbol interval of the message stream in order to reduce the likelihood of error caused by fading in the transmission channel.

L'invention est constituée par une méthode et un appareil servant à préparer une chaîne de symboles faisant partie d'un message en vue d'une transmission sans fil en la précodant au moyen d'une convolution utilisant une « signature » caractéristique de symboles prédéterminés identifiant un utilisateur du système de transmission de messages. La durée de la signature doit être supérieure à l'intervalle intersymbole de la chaîne afin de réduire la probabilité des erreurs résultant d'un évanouissement dans le canal de transmission.

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