EXPERIMENT ON COMMUNICATION ENGINEERING I

Course No.- EE-3206

Prof. Dr. Md. Rafiqul Islam

Md. Nur Kutubul Alam

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

AM VS FM

AMPLITUDE MODULATION (AM)

Internal source of Base band signal

(Voice band)

External source of Base band signal

(Voice band)

Double side band (DSB) signal generator

Single side band (DSB) signal generator

Amplifier

FREQUENCY MODULATION (FM)

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.

COMMUNICATION USING PULSE

SAMPLING TECHNIQUE Minimum sampling rate

SAMPLED SIGNAL SPECTRUM

SAMPLED PULSES

HOW TO GET PAM SIGNAL

DIGITAL MODULATION

Signal representation point of view Pulse code modulation Delta modulation

Singal transmission point of view ASK FSK PSK

HOW TO GET PCM

DIGITAL MODULATION TECHNIQUES

Delta modulation (DM) Linear delta modulation Adaptive delta modulation

Block diagram of PCM

Antialiasing filter Sampler Quantizer Encoder

Analog signal x(t)

Digital Signal

DELTA MODULATION SYSTEM

DELTA MODULATOR

ANOTHER KIND DELTA MODULATOR

DELTA MODULATION DEMODULATOR

DELTA MODULATED WAVEFORM

DIGITAL MODULATION

(Transmission point of view)

FINALLY

Analog communication AM FM Pulse

Digital communication

Representation of each pulse by 1/0Pulse code modulation (PCM)Delta modulation

Transmission of 1/0

ASKFSKPSK