Apparatus and method for generating preamble sequence in an...

H - Electricity – 04 – J

Patent

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H04J 11/00 (2006.01) H04L 27/00 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2468005

Disclosed is an apparatus and a method for generating a preamble sequence in an orthogonal frequency division multiplexing (OFDM) communication system having m subcarriers in a frequency domain. The method comprises grouping the m subcarriers by n subcarriers, where n is less than m,so as to generate p subchannels; and assigning null data to subcarriers except the n subcarriers assigned to the subchannels, assigning data of a given sequence to at least one subchannel selected from the p subchannels, assigning null data to subchannels not selected from the p subchannels, and thereafter performing inverse fast Fourier transform (IFFT) for transforming the data into time- domain data.

L'invention concerne un appareil et un procédé de production d'une séquence préambule dans un système de communication de multiplexage par répartition orthogonale de la fréquence (OFDM) comprenant m sous-porteuses dans une plage de fréquence. Le procédé consiste à grouper les m sous-porteuses en n sous-porteuses, n étant plus petit que m, de façon à produire p sous-canaux, et à attribuer des données zéro aux sous-porteuses excepté aux n sous-porteuses attribuées aux sous-canaux, à attribuer des données d'une séquence donnée à au moins un sous-canal sélectionné parmi les p sous-canaux, à attribuer des données zéro aux sous-canaux non sélectionnés, puis à réaliser une transformée de Fourier inverse rapide (IFFT) afin de transformer les données en données de domaine temporel.

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