Method of detecting pilot tones in a noisy signal

Details Method of detecting pilot tones in a noisy signal Method of detecting pilot tones in a noisy signal

H - Electricity

04

B

H04B 10/148 (2006.01)

Patent

CA 2428395

This invention relates to detecting a pilot tone in an optical fiber. In the method described in the invention, computational complexity is reduced significantly by almost completely removing the need to carry out multipli- cations. To calculate certain spectral components of DFT (Discrete Fourier Transform) only a few multiplications are required. The idea is that for de- tecting one pilot tone, it is adequate to calculate one spectral component of DFT if a specific ratio can be chosen between the pilot tone frequency and the sample rate of the receiver.

L'invention concerne la détection d'une fréquence pilote dans une fibre optique. Dans le procédé décrit dans l'invention, la complexité de calcul est réduite de manière significative par le fait que l'on élimine presque entièrement les multiplications. Pour calculer certaines composantes spectrales de TFD (Transformée de Fourier Discrète), seules quelques multiplications sont nécessaires. L'idée est que pour détecter une fréquence pilote, il est approprié de calculer une composante spectrale de TFD si un rapport spécifique peut être choisi entre la fréquence de tonalité pilote et la fréquence d'échantillonnage du récepteur.

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