地面数字视频广播系统中的频偏估计

Frequency Offset Estimation in Terrestrial Digital Video Broadcasting System

提出了适合数字视频广播地面传输系统的频率偏移估计方案,采用频偏捕获和跟踪多级同步策略,研究分析了时域上基于数据保护间隔的粗小数倍频偏估计算法、频域上基于内插导频单元的整数倍频偏估计算法以及小数倍频偏精估计算法,仿真结果表明:此方案具有良好的性能。

In this paper a frequency offset estimation scheme is presented suitable for Terrestrial Digital Video Broadcasting System. A multi-stage synchronization strategy, two acquisition stages followed by tracking, is adopted. It analyzes the coarse fractional frequency offset estimation algorithm based on guard interval data in time domain. And the integer and fine fractional frequency offset estimation algorithms are also studied based on pilot cells in frequency domain. The computer simulation results show the proposed algorithms’ good performance.