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Reference.org
Higher-order modulation
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<p>Higher-order modulation is a type of <a href="/facts/Digital_modulation/aAXPjINv">digital modulation</a> usually with an order of 4 or higher. Examples: <a href="/facts/Quadrature_phase-shift_keying/TFnpYe64">quadrature phase-shift keying</a> (QPSK), and m-ary <a href="/facts/Quadrature_amplitude_modulation/02j52SWG">quadrature amplitude modulation</a> (m-QAM). </p>