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.

WSJ: Holy Melancholy, 'Batman'!

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

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From a gory opening sequence of North Korean commandos slicing up death-row prisoners as part of their training, the film sketches a love story between a slinky agent from the North (Korean-American actress Kim Yun Jin) and the dashing South Korean spy (local superstar Han Suk Kyu) assigned to track her down.

CNN: ASIANOW - TIME Asia