Analogue & Digital Modulation Techniques

Modulation encodes baseband information onto an RF carrier by varying its amplitude, frequency, or phase. This module covers analogue schemes (AM/FM), digital keying techniques (ASK/FSK/PSK), and quadrature modulation (I/Q, QAM) — the foundation of all modern wireless communication systems.

Key Concepts

Modulation encodes information onto a carrier by varying amplitude, frequency, or phase
AM and FM are analogue schemes used in broadcasting; FM has better noise immunity
Digital modulation (ASK/FSK/PSK/QAM) encodes bits for high-speed data systems
I/Q representation decomposes any signal into two quadrature components
QAM combines amplitude and phase to achieve high spectral efficiency
Constellation diagrams visualise digital modulation scheme performance

Visual Reference

Time Domain Signal

Frequency: 1 Hz, Amplitude: 50

Amplitude

Time →

See how carrier waves change with AM and FM modulation

Prerequisites

sine-wavesfrequency-concepts

Professional

Approach

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