Process for transmitting data in packets on a linearly...

Details Process for transmitting data in packets on a linearly... Process for transmitting data in packets on a linearly...

H - Electricity

04

L

H04L 27/00 (2006.01) H04J 13/02 (2006.01) H04L 27/26 (2006.01) H04J 13/00 (2006.01)

Patent

CA 2267799

The invention concerns the transmission of data packets consisting of a heading followed by a data field. The method consists in transmitting the data of the field by groups of symbols, in generating (5), according to the OFDM technique, subcarriers modulated by the groups, and producing with the set of modulated subcarriers a frequency modulation (8) of a carrier signal delivered by a linear ramp generator (9). When the signal is received, a mixing (11) with a linear ramp (12) results in obtaining the subcarriers which are separated (13) then demodulated (14) for supplying the data. The invention is useful for transmitting data packets, particularly in wide band networks.

L'invention concerne la transmission de données par paquets formés d'un en-tête suivi d'un champ d'informations. Le procédé consiste à transmettre les données du champ par groupes de symboles, à générer (5), selon la technique OFDM, des sous-porteuses modulées par les groupes, et à effectuer avec l'ensemble des sous-porteuses modulées une modulation en fréquence (8) d'un signal porteur délivré par un générateur de rampe linéaire (9). A la réception un mélange (11) avec une rampe linéaire (12) permet d'obtenir les sous-porteuses qui sont séparées (13) puis demodulées (14) pour fournir les données. Application à la transmission par paquets, en particulier dans les réseaux à large bande.

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