With the introduction of domestic freshwater liner shipping, the shipping channel status of Yangtzi's mainline is showed.

在介绍国内内河班轮运输状况的同时，对长江干线航道状况分段进行分析介绍。

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Beginning with brief introduction for the basic principle of OFDM, this paper establishes the system simulation model and thereafter analyzes the synchronization and channel estimation.

文章首先简要介绍了OFDM的基本原理，建立了系统仿真模型，对系统的同步和信道估计进行了分析。

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Because of the introduction of additional poles to the system by acoustic feedback channel, there exists the possibility of unstability of ANC system.

由于声反馈通道向ANC系统引入了新的极点，导致系统有失稳的可能性。

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