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Synchronization is the field of communication technology ( especially digital communications technology) , an important and difficult problem , more prominent with the rapid development of modern communication and network technology , the importance of synchronization . Many communication technologies and systems, such as spread spectrum communication , CDMA and OFDM, etc. , are required to accurately achieve carrier synchronization , clock synchronization is synchronized with the code sequence , otherwise the performance of the system will not be guaranteed . In this paper, an overview of the synchronization basic principle , the DMR digital private wireless communications protocol physical layer , data link layer , and the call control layer based on , highlighting the the DMR system synchronization , timing issues . The focus of this work is to the DMR system frame synchronization and timing of the design and development of the program , also shows the different types of frame format synchronization and timing design methods . At the end of the article , simulation and testing , performance analysis is made ??of the synchronization and timing .
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