四相相移调制是利用载波的四种不同相位差来表征输入的数字信息，是四进制移相键控。

Quadrature phase shift carrier modulation is used to represent the four different phase inputs of digital information, is quaternary phase shift keying.

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四相相移调制是利用载波的四种不同相位差来表征输入的数字信息，是四进制移相键控。

Quadrature phase shift carrier modulation is used to represent the four different phase inputs of digital information, is quaternary phase shift keying.

youdao