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.
通过在目标函数中增加先验知识约束，我们可以解决波阻抗反演的病态问题及带限问题。
By introducing the prior information constraint in the objective function, we can solve the ill-posed problem and band-limited problem for the impedance inversion.
拓展了带限信号一步外推算法，使之能够适用于带通信号的情况。
The one-step extrapolation procedure for low-pass signal was extended to the band-pass case.
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