Abstract
Background & Objective: In this research work, the basic digital communication system
with frequency shift keying modulation technique has been implemented in MATLAB.
Methods: The same sinusoidal signal in audio frequency range has been transmitted and reconstructed
with the different number of quantization level and sampling rate, where sampling frequency has been
taken according to the Nyquist theorem. It has been seen that reconstructed signal at low data rate has
appeared with better resolution compared with the reconstructed signal at the high data rate.
Results and Conclusion: In this regard, it is evident that the resolution of a reconstructed signal not
only depends on data rate but it also depends on the ratio of sampling rate to quantization level. So it
is required to optimize the ratio of sampling rate to quantization level before transmitting audio signal.
Keywords:
Analog to digital converter, digital to analog converter, frequency shift keying, quantization
level, reconstructed signal, sampling rate.
Graphical Abstract
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