Principle of Communication

Introduction

• Concept of Modulation and De- Modulation
• Basic schemes of modern Communication system

Amplitude Modulation

• Expression for A-M , carrier wave, side band and modulation index
• Power distribution in carrier and side band
• DSB, DSB-SC, SSB-SC and VSB

Frequency Modulation

• Expression of Frequency Modulated wave
• Modulating index and Frequency Deviation
• Effect of Noise on FM wave
• Pre-emphasis and De-emphasis
• Narrow band and Wide band FM

Type of AM modulators

• Collector modulators
• Base modulators
• Balance modulators
• PAM, PAW, PPM

Type of FM modulators

• Reactance modulators
• Varactor diode modulator
• Armstrong phase modulator

Demodulation of FM wave

• FM demodulator (Single slope and Dual slope detector)
• Various Type of Detectors