高清晰度数字电视中的符号定时检测算法

Algorithm for symbol timing detection in HDTV

分析研究了欧洲数字视频地面广播 (DVB T)系统 ,提出了基于FPGA的COFDM接收机同步解决方案 ,对该方案中的符号定时同步、频率同步和采样钟同步作了简要阐述 ;经大量的同步算法仿真分析 ,提出一种新的符号定时检测算法 :通过设置门限、保持窗宽和相应时延可准确估计符号起始位置及频偏 ,相应的FPGA硬件电路经高清晰度数字电视功能样机调试证明 。

This paper presented a synchronization scheme for COFDM receiver easy to be implemented with FPGA by analyzing the European Digital Video Broadcasting system. The symbol timing recovery, frequency and sample clock synchronization in this scheme were described. A new symbol timing detection algorithm was proposed through lots of computer simulation results. Symbol initial position and frequency offset can be estimated in high accuracy by setting the gate value, remaining the window width and the corresponding time delay. FPGA hardware circuit of this algorithm in the functional HDTV testing process shows its low complexity and excellent performance.