求翻译：本文针对4FSK、QPSK和QAM信号调制方式识别问题，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，基于PowerPC平台，实现了针对4FSK、QPSK和QAM调制方式的识别处理。是什么意思？

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This article is targeted, QPSK and QAM 4FSK signal modulation methods to identify issues in accordance with 4FSK, QPSK and QAM SIGNAL their frequency, phase and amplitude parameters, the distinction between by extracting the signal frequency transient, transient phase and transient amplitude, constr

This article in view of 4FSK, QPSK and the QAM signal modulation way recognition question, rests on 4FSK, QPSK and the QAM signal respective frequency, the phase and the scope parameter difference, through the extraction signal instantaneous frequency, the instantaneous phase and the instantaneous s

Paper for 4FSK, and QPSK and QAM signal modulation way recognition problem, according to 4FSK, and QPSK and QAM signal their frequency, and phase and range parameter of difference, through extraction signal instantaneous frequency, and instantaneous phase and instantaneous range, structure zero Cent

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