Quadrature Amplitude Modulation
Quadrature Amplitude Modulation (QAM) is a digital modulation scheme used in telecommunications to transmit data by varying both the amplitude and phase of two carrier waves that are 90 degrees out of phase with each other. It combines amplitude-shift keying (ASK) and phase-shift keying (PSK) to encode multiple bits per symbol, enabling high data rates in bandwidth-limited channels. QAM is widely used in modern communication systems such as Wi-Fi, cable modems, and digital television.
Developers should learn QAM when working on digital communication systems, signal processing, or wireless technologies, as it is fundamental for achieving efficient data transmission in constrained bandwidths. It is essential for implementing protocols like 802.11 (Wi-Fi), DOCSIS (cable internet), and 5G, where high spectral efficiency is required to support high-speed data and multimedia services.