Preamble for the assessment of channel impulse response in a...

Details Preamble for the assessment of channel impulse response in a... Preamble for the assessment of channel impulse response in a...

H - Electricity

04

L

H04L 1/02 (2006.01) H04B 7/08 (2006.01) H04L 7/04 (2006.01) H04L 25/02 (2006.01)

Patent

CA 2264789

A preamble in a digital signal transmission system characterized by several different bit sequences (m1-m5) which are suited for packet synchronization and channel assessment. M-sequences with a length of, for instance, 31 bits are used advantageously and repeated three times. This enables antenna selection in a receiver. In addition the frequency offset can be determined on the basis of two sequences (54, 55) captured within a specific time period.

Dans un système numérique de transmission de signaux, un préambule est caractérisé par plusieurs séquences binaires différentes (m1-m5), qui conviennent aussi bien pour la synchronisation des paquets que pour l'évaluation des canaux. Avantageusement, le système utilise m séquences d'une longueur de 31 bits par exemple, répétées trois fois. Ceci permet de sélectionner une antenne au niveau d'un récepteur, ainsi que, sur la base de deux séquences (S4, S5) sélectionnées dans un intervalle fixe, de transmettre le décalage de fréquence.

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