EXP NO: 3 SSB-SC-AM MODULATION using SCILAB
AIM:
To write a program to perform SSBSC modulation and demodulation using SCI LAB and study its spectral characteristics
EQUIPMENTS REQUIRED
• Computer with i3 Processor
• SCI LAB
Note: Keep all the switch faults in off position
Algorithm
- Define Parameters: • Fs: Sampling frequency. • T: Duration of the signal. • Fc: Carrier frequency. • Fm: Frequency of the message signal. • Amplitude: Maximum amplitude of the message signal.
- Generate Signals: • Message Signal: The baseband signal that will be modulated. • Carrier Signal: A high-frequency signal used for modulation. • Analytic Signal: Constructed using the Hilbert transform to get the in-phase and quadrature components.
- SSBSC Modulation: • Modulated Signal: Create the SSBSC signal using the in-phase and quadrature components, modulated by the carrier.
- SSBSC Demodulation: • Mixing: Multiply the SSBSC signal with the carrier to retrieve the message signal. • Low-pass Filtering: Apply a low-pass filter to remove high-frequency components and recover the original message signal.
- Visualization: • Plot the message signal, carrier signal, SSBSC modulated signal, and the recovered signal after demodulation.
PROCEDURE
• Refer Algorithms and write code for the experiment. • Open SCILAB in System • Type your code in New Editor • Save the file
• Execute the code • If any Error, correct it in code and execute again • Verify the generated waveform using Tabulation and Model Waveform
Model Waveform
Program Am=9.5; Ac=19; fm=709; fc=7090; fs=70900; t=0:1/fs:2/fm; m1=Amcos(23.14fmt); subplot(4,1,1); plot(t,m1); c1=Accos(23.14fct); subplot(4,1,2); plot(t,c1); m2=Amcos(1.57-(23.14fmt)); c2=Accos(1.57-(23.14fct)); s1=m1.*c1; s2=m2.*c2; LSB=s1+s2; subplot(4,1,3); plot(t,LSB); USB=s1-s2; subplot(4,1,4); plot(t,USB);
OUTPUT WAVEFORM
TABULATION
RESULT:
Thus, the SSB-SC-AM Modulation and Demodulation is experimentally done and the output is verified.