经过限带滤波后的QDPS K信号的码元波形可分为稳定区与过渡区，根据这一特点可以利用DFT方法来实现信号的解调和位同步。
After a bandpass filter, QDPSK signal's symbol can be divided into steady section and transition section, so the demodulation and synchronization for the signal can be realized with DFT.
用束团同步信号触发波形发生器，生成窄脉冲；
Triggered by the in-phase signal, the waveform generator outputs a pulse burst.
传统信号发生器产生信号但无法同步显示输出信号波形及相应参数。
The traditional signal generator only can generate signals but can not display the output waveforms and the corresponding parameters synchronously.
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