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。

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The desired user's signal waveform is utilized to ensure optimal recovery of the user's symbol information.

对期望用户信号波形的使用保证了用户符号信息的最优恢复。

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Doppler effect causes not only carrier frequency offset, but also symbol expansion or compression for wideband acoustic communication signal.

多普勒不仅造成宽带水声通信信号的载波频率偏移，而且引起码元符号的展宽或压缩。

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Then through the use of GPS-based reference clocks at each tower (for both time and frequency), the signals are synced so each can emit a perfect copy of both signal and symbol data.

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As an example how the lower risk without sacrificing performance works, with a buy signal on the Transportation sector we bought the iShares Transportation ETF, symbol IYT, in December rather than a selection of individual transportation stocks.

FORBES: Swear Off Individual Stocks For Better Returns