在典型的通信系统中，调制过程是数字信号加载在载波的幅度值、载波的频率或者载波的相位上。
In the model communications system, the modulation process also is loaded the digital signal in the carrier scope value, the carrier frequency or on the carrier phase.
CPM信号包含大量的信号形式，它们的共同特点是信号包络恒定、相位连续，尤其适合于无线通信。
CPM consists of a large family of signals that are especially suitable for wireless communication, and the common characteristics of these signals are their constant amplitude and continuous phase.
在实际通信系统中当信号处于深衰落时，最小均方误差(MMSE)检测器经常失去对信号的相位跟踪。
It is noted that the minimum mean square error (MMSE) detector often loses phase to lock a desired signal when the desired signal dips into a deep fade.
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