Higher-order modulation - AbsoluteAstronomy.com

Higher-order modulation is a type of digital modulation usually with an order of 4 or higher. Examples: quadrature phase shift keying (QPSK), m-ary quadrature amplitude modulation

Quadrature amplitude modulation

Quadrature amplitude modulation is both an analog and a digital modulation scheme. It conveys two analog message signals, or two digital bit streams, by changing the amplitudes of two carrier waves, using the amplitude-shift keying digital modulation scheme or amplitude modulation analog...

(m-QAM), etc.

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