System and method for detecting presence of digitally...

Details System and method for detecting presence of digitally... System and method for detecting presence of digitally...

2007-12-11

2007-12-11

Kumar, Pankaj (Department: 2611)

Pulse or digital communications

Receivers

Amplitude modulation

Reexamination Certificate

active

10317331

ABSTRACT:
The disclosure is directed to a system for detecting digitally modulated waveforms on a transmission channel. The system includes an amplitude modulation detector configured to detect amplitude variations on the transmission channel. The system also includes a first bandpass filter configured to receive a signal from the amplitude modulation detector monitoring the transmission channel and tuned to a wavelength corresponding to the symbol rate of the digitally modulated waveform to be detected. Further, the system includes a second bandpass filter configured to receive the signal from the amplitude modulation detector monitoring the transmission channel and tuned to a second wavelength. Further still, the system includes a means for comparing the output of the first and second bandpass filters to determine the presence of a digitally modulated waveform.

REFERENCES:
patent: 5640423 (1997-06-01), Archer

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