The paper focus on the research of channel estimation method in OFDM system.

本文的研究重点是OFDM系统的信道估计方法。

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So it is necessary to study the channel estimation method of MIMO-OFDM systems.

因此，有必要对MIMO - OFDM系统的无线信道估计方法进行研究。

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Then, the principle and method of channel pre-estimation is introduced.

接着，说明了信道预估计的原理及方法。

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Then, the principle and method of channel pre-estimation is introduced.

接着，说明了信道预估计的原理及方法。

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