Method of transmission and device to carry out said method

H - Electricity – 04 – L

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Details

H04L 27/18 (2006.01) H04L 27/10 (2006.01) H04B 1/69 (2006.01)

Patent

CA 2269788

Transmission method in which angle-modulated pulses with temporally opposite angle modulation are generated in the receiver during the duration of the pulse, which pulses are superimposed by means of a first superimposing element (8, 9), in each case in pairs, into a folded pulse, whereby the folded pulses transmitted to the receiver, after a modulation process, carry information impressed upon them, and these folded pulses are filtered at the receiver through two parallel- connected, complementary dispersion filters with frequency-dependent group delay characteristics, whereby the frequency-dependent group delay characteristics of the two dispersion filters are matched to the angle-modulation, in each case, of one of the two pulses forming in their superposition the folded pulse, in such a way that at the output of the dispersion filter, in each case, a combined signal appears that consists of one compressed pulse with increased amplitude and one expanded pulse with decreased amplitude, whereby the signals at the outputs of both dispersion filters at the receiver are combined by means of a second superimposing element.

L'invention concerne un procédé de transmission selon lequel un émetteur émet des impulsions dont la modulation angulaire est effectuée de façon chronologiquement inversée pendant leur durée. Ces impulsions sont superposées respectivement par paires au moyen d'un premier élément de superposition (8, 9) pour former une impulsion repliée. Ces impulsions repliées, transmises au récepteur, portent une information qui leur a été attribuée par modulation. Ces impulsions repliées sont filtrées dans le récepteur par deux filtres de dispersion complémentaires, montés en parallèle et dont la caractéristique de temps de transit en groupe est fonction de la fréquence, cette caractéristique de temps de transit en groupe est fonction de la fréquence, cette caractéristique des deux filtres de dispersion étant adaptée à la modulation angulaire respectivement de l'une des deux impulsions formant, par superposition, l'impulsion repliée, de telle manière qu'à la sortie des filtres de dispersion, soit respectivement émis un signal combiné composé d'une impulsion comprimée d'amplitude élevée et d'une impulsion ayant subi une expansion d'amplitude réduite. A la sortie des deux filtres de dispersion placés à l'intérieur du récepteur, les signaux sont réunis au moyen d'un second élément de superposition.

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