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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

Decoding unstable FSK modulated signals.

H Richner1, P D Phillips

  • 1Federal Institute of Technology, Laboratory for Atmospheric Physics, CH-8093 Zurich, Switzerland.

The Review of Scientific Instruments
|August 1, 1978
PubMed
Summary
This summary is machine-generated.

A nonstandard circuit enhances phase locked loops (PLLs) for decoding frequency shift keying (FSK) signals. This improves decoding accuracy for distorted or poorly modulated FSK transmissions.

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Area of Science:

  • Electrical Engineering
  • Signal Processing

Background:

  • Phase locked loops (PLLs) are commonly used for demodulating frequency shift keying (FSK) signals.
  • Standard PLLs exhibit high sensitivity to minor frequency variations in FSK 'mark' and 'space' tones, impacting decoding accuracy.

Purpose of the Study:

  • To investigate methods for improving the robustness of PLL-based FSK decoding.
  • To enhance the ability of PLLs to accurately decode distorted or poorly modulated FSK signals.

Main Methods:

  • Implementation of a nonstandard auxiliary circuit integrated with a standard phase locked loop (PLL).
  • Testing the modified PLL system with various simulated distorted and poorly modulated FSK signals.

Main Results:

  • The nonstandard circuit significantly improved the PLL's output stability and accuracy.
  • The enhanced PLL demonstrated superior performance in decoding FSK signals with frequency deviations and modulation imperfections.

Conclusions:

  • A nonstandard circuit effectively enhances PLL performance for FSK signal decoding.
  • This approach offers a practical solution for improving FSK demodulation in challenging signal conditions.