This document discusses angle modulation techniques used in communication systems including frequency modulation (FM) and phase modulation (PM). It provides definitions and properties of angle-modulated waves, and notes there is a trade-off between increased transmission bandwidth and improved noise performance when using these modulation methods. The document was produced by AL-Nahrain University student Saeed Jafar for their first semester, third class communication systems course.

1. communication system
Angle modulation: FM & PM &
Spectrum of Angle modulation wave
AL-Nahrain University
Class : third
Semester : first
Name : ‫هللا‬ ‫عبد‬ ‫سعيد‬ ‫جعفر‬

2. Modulation Concept
• Modulation is the process by which a message
or
• information-bearing signal is transformed into
another signal to facilitate transmission over a
communication channel
• – Requires an auxiliary signal called carrier
• – The modulation process is performed to
accomplish several
• Objectives

3. Basic Definitions

7. Properties of Angle-Modulated Waves

9. Trade-OFF of Increased Transmission
Bandwidth for Improved Noise Performance