数字电视广播的单频网实现及场地实验

Implementation and field trials of SFN

为了实现地面数字多媒体/电视广播(DM B-T)方案的单频网(SFN)组网模式,根据DM B-T方案中的数据帧结构与绝对时间同步的特点,提出了一种基于DM B-T方案的单频网实现方法。每隔一个大帧(m ega-fram e)在M PEG-2传输码流(TS)中插入初始化包(M IP),通过检测其中包含的网络延时和时间标识信息,经过简单计算,使网络中所有发射机在时间上实现同步。通过列单频网广播的场地实验证明该方法是可行的。

The single frequency network structure based terrestrial digital multimedia/television broadcasting （DMB-T） was implemented by synchronizing each signal frame in real time. A mega-frame initialization packet （MIP） inserted in the transport stream （TS） every mega-frame contains information on the network delay and synchronization stamp. A simple calculation gives the local additional delay which will allow synchronization of all the transmitters in the network. Field trials of the single frequency network validate the feasibility of scheme based on DMB-T.