1.1 Explain the difference between electronic communication and communication systems.
The Fourier transform of a rectangular pulse is given by:
The frequency deviation is given by:
2.1 Find the Fourier transform of a rectangular pulse.
Solution:
3.1 An AM signal has a carrier frequency of 100 kHz and a modulating signal of 5 kHz. Calculate the sideband frequencies.
Solution:
5.1 Explain the difference between coherent and noncoherent digital modulation.
The power spectral density (PSD) of a random signal is given by:
Solution:
Coherent digital modulation uses a reference carrier signal at the receiver to detect the transmitted signal, while noncoherent digital modulation does not use a reference carrier signal.