中文摘要：

新一代地面数字电视广播（DTTB）系统需要快速稳健的系统同步和对多种工作模式的自适应支持与可靠识别。针对新一代DTTB系统中的符号定时同步和载波同步问题，介绍了利用正交频分复用（OFDM）前导实现同步方法的发展，详细分析了欧洲第二代地面数字电视标准（DVB—T2）与中国的地面数字电视广播传输演进系统（DTMB—A）中前导结构的设计，论述了两种前导符号的特点，并仿真分析比较了两种结构的同步检测方法与性能。

英文摘要：

The second generation digital terrestrial television broadcasting （DTTB） systems should support fast and robust system synchronization and have the reliable detection ability of multiple working service modes. In this paper, the preamble design used in the second generation DTTB systems based on OFDM technology is analyzed. The preamble structure adopted in European DVB-T2 standard and Chinese DTMB-A systems are detailed introduced. Simulation results of these two preambles are also provided for the performance comparison.