QAM是Quadrature Amplitude Modulation的缩写，中文译名为“正交振幅调制”，其幅度和相位同时变化，属于非恒包络二维调制。QAM是正交载波调制技术与多电平振幅键控的结合 。-QAM is Quadrature Amplitude Modulation acronym Chinese translation for　quadrature amplitude modulation , the amplitude and phase changes at the same time, a non-constant envelope modulation dimensional. QAM is a combination of orthogonal carrier modulation technology and multi-level amplitude keyed.