Development and Study of Demodulation Techniques for Frequency Manipulated Signals

The goal of our research is development and study of different demodulation techniques for a frequency shift keyed sig-nals. The signal under study is a frequency-shift keyed (FSK) signal when the information signal regulates the carrier fre-quency. 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 demodu-lating frequency-shift keyed (FSK) signal and we compare the techniques using the criterion of error number of a demodu-lated 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 demodu-lation techniques with different signal-to-noise ratio and produced a table containing information on demodulation ac-curacy 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.

Authors: D.I.Kaplun, V.V.Gulvanskiy, I.I.Kanatov, D.M.Klionskiy, V.F.Lapizkiy, V.I.Bobrovskiy, K.V.Frolov, A.K.Skvortzov

Direction: Радиотехнические средства передачи, приема и обработки сигналов

Keywords: Demodulation, Frequency-Shift Keyed Signals, Fast Fourier Transform, Autocorrelation Function, Double Correlation

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