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Article · DOAJ · April 1, 2017

Development and Study of Demodulation Techniques for Frequency Manipulated Signals

Dmitrii Kaplun, Vyacheslav V. Gulvanskiy, Ivan I. Kanatov, Dmitry M. Klionskiy, V. F. Lapizkiy, V. I. Bobrovskiy

Dmitry Kaplun
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Abstract

The goal of our research is development and study of different demodulation techniques for a frequency shift keyed signals. The signal under study is a frequency-shift keyed (FSK) signal when the information signal regulates the carrier frequency. We consider a model imitating data transmission channels and allowing us to perform error counting. The data transmission channels have ideal synchronization. Several techniques of demodulator design are introduced for demodulating frequency-shift keyed (FSK) signal and we compare the techniques using the criterion of error number of a demodulated signal relative to a signal prior to modulation for different signal-to-noise ratio. Signal-to-noise ratio is calculated as a ratio of the energy of the information symbol to the noise power spectral density. We have tested different demodulation techniques with different signal-to-noise ratio and produced a table containing information on demodulation accuracy for different techniques. Overall, we have simulated 100 sec. of continuous bit packages. We indicate that the best results for signal-to-noise ratio exceeding 5 dB are provided with the technique based on double correlation, and for signal-to-noise ratio less than 5 dB - with the technique based on the fast Fourier transform.

Advanced Signal Processing TechniquesAdvanced Wireless Communication TechniquesWireless Signal Modulation Classificationfrequency shift keyingFSK demodulationdemodulator design

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