在地面数字电视系统中，广播信道存在着突发噪声干扰和随机噪声干扰，而且前者的危害甚于后者。

In digital terrestrial television system, there is much burst and random noise in the broadcasting channel, and burst noise is more harmfully than random noise.

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在RAN通过广播信道发给MS的信息中只有系统信息而没有别的信令。

There is no signalling between RAN and the MS except for system information that is sent from RAN on a broadcast channel to the MS.

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分析了中国数字电视地面广播标准中的系统帧结构，并根据信号帧头的循环特性，提出了一种性能较好的信道估计算法；

The frame structure in Chinese DTTB standard is introduced, and a channel estimation algorithm with a better performance is given according to the cycle characteristics of the signal frame head.

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