Experiment on Communication Engineering I

1. Experiment on Communication Engineering I Course No.- EE-3206 Prof. Dr. Md. Rafiqul Islam Md. Nur Kutubul Alam

2. Name of the Experiment Analog: • Amplitude modulation (AM) • Frequency modulation (FM) • Communication using Pulse PAM (Pulse Amplitude modulation) PWM PCM Digital: • Analog to digital conversion by PCM system • Study on delta modulation • Digital signal transmission by ASK, FSK, and PSK modulations

3. AM vs FM

4. Amplitude modulation (AM) Internal source of Base band signal (Voice band) Double side band (DSB) signal generator Amplifier External source of Base band signal (Voice band) Single side band (DSB) signal generator

5. Frequency modulation (FM)

6. Analog communication using Pulse In this communication technique, some samples of original signal is transmitted. Each of the sample of original signal looks like a pulse. • Pulse Amplitude modulation (PAM) • Pulse width modulation (PWM) • Pulse position modulation (PPM) This process increases the capacity of the system.

7. Communication using pulse

8. Sampling technique • Minimum sampling rate

9. Sampled Signal Spectrum

10. Sampled pulses

11. How to get PAM signal

12. Digital modulation • Signal representation point of view • Pulse code modulation • Delta modulation • Singal transmission point of view • ASK • FSK • PSK

13. How to get PCM

14. Block diagram of PCM Digital Signal Antialiasing filter Quantizer Encoder Sampler Analog signal x(t) Digital modulation techniques Delta modulation (DM) • Linear delta modulation • Adaptive delta modulation

15. Delta modulation system

16. Delta modulator

17. Another kind delta modulator

18. Delta modulation demodulator

19. Delta modulated waveform

20. Digital modulation (Transmission point of view)

21. Finally • Analog communication • AM • FM • Pulse Digital communication • Representation of each pulse by 1/0 • Pulse code modulation (PCM) • Delta modulation • Transmission of 1/0 • ASK • FSK • PSK