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.
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。
Iron: Metallic chemical element, one of the transition elements, chemical symbol Fe, atomic number 26.
铁：金属化学元素，为过渡元素的一种，化学符号Fe，原子序数26。
Iridium: Metallic chemical element, one of the transition elements, chemical symbol Ir, atomic number 77.
铱：金属化学元素，为过渡元素的一种，化学符号Ir，原子序数77。
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