求翻译：本文依据4FSK、QPSK和QAM信号各自频率、相位和幅度参数的区别，通过提取信号瞬时频率、瞬时相位和瞬时幅度，构造零中心归一化瞬时幅度的谱密度最大值和归一化瞬时频率的方差两个特征参数，是什么意思？

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On the basis of this, QPSK AND QAM 4FSK signal their frequency, phase and amplitude parameters, the distinction between by extracting the signal frequency transient, transient phase and transient amplitude, construct zero center normalized instantaneous amplitude spectral density the maximum value a

This article rests on 4FSK, QPSK and the QAM signal respective frequency, the phase and the scope parameter difference, through extraction signal instantaneous frequency, instantaneous phase and instantaneous scope, structure zero center normalization instant scope spectral density maximum value and

Based 4FSK, QPSK and QAM signal frequency and phase difference and amplitude parameters, through the extraction of instantaneous frequency and instantaneous amplitude and instantaneous phase, constructs zero-Center normalization of instantaneous amplitude spectral density maximum and instantaneous f

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