Step 1: Understand what modulation means. Modulation is a technique used to encode information onto a carrier signal for transmission.
Step 2: Learn about different modulation techniques. There are several types, including Amplitude Modulation (AM), Frequency Modulation (FM), Phase Shift Keying (PSK), and Quadrature Amplitude Modulation (QAM).
Step 3: Identify the purpose of digital communication systems. These systems need to transmit data efficiently and reliably.
Step 4: Recognize that QAM combines both amplitude and phase variations to transmit data, making it efficient for digital communication.
Step 5: Conclude that QAM is the most commonly used modulation technique in digital communication systems because it can carry more information compared to other methods.
