FM means variation in the frequency of the carrier according to
the amplitude of the message signal.The FM can be done by simply
multiplying he message signal with carrier .At the demodulation
again carrier will be multipliedwith the modulated signal.In
frequency modulation the instantaneous frequency is linearly
proportional to the magnitude of the modulating wave. Louder tones
with AM mean greater changes in amplitude. Louder tones with FM
mean greater changes in frequency.
Tasks:-1. Generate the waveform message signal. (Sinusoidal,
square
or triangular) code diagram
2. Generate a sinusoidal waveform as carrier which should be of
much higher frequency as compared to the message signal.
code diagram
3. Modulate the message and again observe its spectral
components.
code diagram
4. Demodulate the message signal and again observe its spectral
components.
code diagram
Note:-Briefly explain your understanding of FM with its
mathematical theory. Perform both Frequency modulation and
demodulation and observe their spectral components. After
demodulations observe that the signal is re-translated to original
spectral components.The report should contain the block diagram of
the system with both time domain and frequency domain plots.
COMSATS Institute of Information Technology
Park Road, Islamabad
Department of Electrical Engineering
Course Title: Analog Communications
Course code: EE 352
Semester: 5th.
Course Instructor: Arooj Mubashara
Lab 8
Frequency Modulator and Demodulator in MATLAB
Marks(10,10)
Students Name:
Reg. No
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____________________
( , )
_________________
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Date
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Description:-
FM means variation in the frequency of the carrier according to
the amplitude of the message signal.
The FM can be done by simply multiplying he message signal with
carrier .At the demodulation again carrier will be multiplied with
the modulated signal.
In frequency modulation the instantaneous frequency is linearly
proportional to the magnitude of the modulating wave. Louder tones
with AM mean greater changes in amplitude. Louder tones with FM
mean greater changes in frequency.
Tasks:-
1. Generate the waveform message signal. (Sinusoidal, square or
triangular)
code
diagram
2. Generate a sinusoidal waveform as carrier which should be of
much higher frequency as compared to the message signal.
code
diagram
3. Modulate the message and again observe its spectral
components.
code
diagram
4. Demodulate the message signal and again observe its spectral
components.
code
diagram
Note:-Briefly explain your understanding of FM with its
mathematical theory. Perform both Frequency modulation and
demodulation and observe their spectral components. After
demodulations observe that the signal is re-translated to original
spectral components.The report should contain the block diagram of
the system with both time domain and frequency domain plots.
