摘要
单频网(Single Frequency Network,SFN)的运行对发射机的同步提出极高的技术要求,任何同步误差都可能对网络性能产生不利影响。首先分析SFN中时间、频率和相位同步误差的定义与分类,其次探讨其对关键性能指标的影响机理,并量化同步误差对覆盖范围和信道容量的削弱程度,最后针对同步误差的成因提出提高授时源精度、优化参考时钟选型、改进同步跟踪环路设计及多径信号抑制等策略。
The operation of Single Frequency Network(SFN)puts forward very high technical requirements for the synchronization of transmitters,and any synchronization error may adversely affect the performance of the network.Firstly,the definition and classification of time,frequency and phase synchronization errors in SFN are analyzed.Secondly,the influence mechanism of synchronization errors on key performance indicators is discussed,and the weakening degree of synchronization errors on coverage and channel capacity is quantified.Finally,according to the causes of synchronization errors,strategies such as improving timing source accuracy,optimizing reference clock selection,improving synchronization tracking loop design and multi-path signal suppression are proposed.
作者
林胜威
LIN Shengwei(Guangdong province 903 Television FM Station,Zhongshan 528403,China)
出处
《电视技术》
2025年第7期152-154,共3页
Video Engineering
关键词
数字电视
单频网(SFN)
同步误差
干扰抑制
digital television
Single Frequency Network(SFN)
synchronization error
interference suppression
