Quadrature Amplitude Modulation (QAM)
Quadrature amplitude modulation is a way of encoding data by varying both the amplitude and the phase of a carrier signal.
What is Quadrature Amplitude Modulation (QAM)?
QAM schemes are named after the number of distinct symbols they use, such as 16-QAM, 64-QAM or 256-QAM. Higher orders carry more bits per symbol but need better signal quality. QAM is used in mobile, Wi-Fi, cable and DSL systems.