The training sequence of channel estimation in frequency domain should have flat spectrum, which can estimate channel fast and exactly.

作为频域信道估计的训练序列要求具有平坦的频谱特性，可以快速准确地对信道进行估计。

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Base on structure characteristics of the training sequence, a quite accurate frequency offset can be obtained through a data correlation operation.

通过数据相关运算，结合构造训练序列的特点，得出比较准确的频率偏移值。

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Then basing on the LS estimation, the paper researches the best design methods of the training sequence including the orthogonal training and shift orthogonal training sequences.

然后重点研究LS估计下的最优训练序列设计方法，包括正交训练序列设计和移相正交训练序列设计。

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At least the training sequence involves some action.

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"The helicopter sequence was shot the previous week during a training exercise, " he said.

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