Signals and Systems

Chapter 11

Amplitude Modulation

Chapter Objectives

• Learn the significance of and the need for modulation in analog and digital communication systems.
• Understand amplitude modulation as one method of embedding an information bearing signal into a high frequency sinusoidal carrier.
• Explore time- and frequency-domain characteristics of amplitude modulated signals. Understand variants of amplitude modulation (DSB and SSB).
• Study techniques for obtaining modulated signals as well as extracting information bearing signals from modulated signals.

11.1 Introduction

The main purpose of any communication system is to facilitate the transfer of an information bearing signal from one point in space to another, with an acceptable level of quality.

Consider, ...