Discusses the object synchronization problem of several existing multimedia document models, and analyses mostly the synchronization principle of each multimedia object synchronization model.
针对现有的几种多媒体文件模型中的对象同步问题进行了探讨，主要分析了其中多媒体对象同步模型的同步机理。
The synchronization principle of IRIG-B code is analyzed. When applying IRIG-B code in substation IED, neither communication messages of fieldbus nor multiple pulse signals of GPS are needed.
分析了B码的对时机理，指出变电站的智能设备采用B码对时，就不再需要现场总线的通信报文对时，也不再需要GPS输出大量脉冲接点信号。
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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