Method for deriving interference signals from modulated...

H - Electricity – 04 – B

Patent

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H04B 1/10 (2006.01)

Patent

CA 2660808

The invention relates to a method for deriving interference signals from modulated, digital signals. The receiver end then reconstructs the modulated digital signals sent by a transmitter. These reconstructed modulated digital signals are then subtracted from the received modulated digital signals, and the result of the subtraction is used to estimate the interference signals without influence by prior filtering at the receiver end. By way of example, it is possible to demodulate the interference signals estimated at the receiver end in order to ascertain possible unauthorized carrier frequencies which disturb the regular carrier frequencies, even if the interference signals are not completely in the bandwidth of the regular carrier frequency or carrier frequencies.

L'invention concerne un procédé pour dériver des signaux parasites à partir de signaux numériques modulés. Les signaux numériques modulés émis par un émetteur sont alors reconstruits du côté du récepteur. Ces signaux numériques modulés reconstruits sont alors soustraits des signaux numériques modulés reçus et les signaux parasites sont estimés du côté du récepteur à partir du résultat de la soustraction sans influence par le filtrage précédent. Les signaux parasites estimés du côté du récepteur permettent de déterminer, par exemple par démodulation, les éventuelles fréquences porteuses non autorisées qui viennent perturber les fréquences porteuses normales, même lorsque les signaux parasites ne se trouvent pas entièrement dans la bande passante de la ou des fréquences porteuses normales.

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