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

2006-09-19

2006-09-19

Mai, Tan V. (Department: 2193)

Electrical computers: arithmetic processing and calculating

Electrical digital calculating computer

Particular function performed

Reexamination Certificate

active

07111030

ABSTRACT:
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.

REFERENCES:
patent: 6940843 (2005-09-01), Goodall et al.
patent: 6985548 (2006-01-01), Jabbar et al.
patent: 2002/0048063 (2002-04-01), Jung et al.
patent: 2004/0184484 (2004-09-01), Marchok et al.
patent: 0 876 025 (1998-11-01), None
patent: 0 939 527 (1999-09-01), None
patent: WO 98/10548 (1998-03-01), None

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