Method of obtaining spectral voids in the transmission of...

H - Electricity – 04 – B

Patent

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H04B 3/54 (2006.01) H04L 5/26 (2006.01) H04L 27/26 (2006.01)

Patent

CA 2571028

The invention relates to a method of obtaining spectral voids in the transmission of signals over the electric network. The inventive method enables signals to be transmitted over the electric network with a suitable power spectral density, such that said power spectral density is adjusted to existing regulations with the possibility of spectral voids being introduced into the transmission in an efficient manner. The invention is characterised by: the adjustment of the power of one or more OFDM signal carriers for the generation of the aforementioned voids, the use of IDFTs of at least 1024 points (if the IDFT is complex) or at least 2048 points (if the IDFT is real), and the use of a window which multiplies the symbols to be transmitted over time.

L'invention concerne un procédé qui permet de transmettre des signaux via le réseau électrique avec une densité spectrale de puissance appropriée, de sorte que la densité spectrale de puissance soit ajustée à la réglementation en vigueur grâce à l'introduction efficace de vides spectraux dans la transmission. L'invention est caractérisée par l'ajuste de la puissance d'une ou plusieurs porteuses d'un signal de multiplexage fréquentiel optique afin de générer ces vides, par l'utilisation d'une transformée inverse discrète de Fourier d'au moins 1024 points (si la transformée inverse discrète de Fourier est complexe) ou d'au moins 2048 points (si la transformée inverse discrète de Fourier est réelle) et par l'utilisation d'une fenêtre qui multiplie les symboles qui vont être transmis dans le temps.

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