DAB接收机中载波频偏估计

Estimation of frequency offset in DAB receiver

同步系统是 DAB 接收机的关键之一,针对其中的载波同步算法进行了分析。在理论分析载波频率偏差对 DAB 系统性能影响的基础上,介绍了2种分别用于载波粗频偏估计和细频偏估计的算法。粗频偏估计算法基于 DAB 信号所特有的相位参考符号(PRS),细频偏估计算法基于 OFDM 信号所特有的循环前缀(CP),对其它采用 OFDM 技术的系统具有很好的通用性。仿真结果表明这2种算法估计性能良好。

Synchronization is one of the key problems in the design of DAB receiver. The frequency synchronization algorithm is anylized. Based on the analysis of the affection of carrier frequency offset on the performance of DAB system, we introduce two frequency synchronization algorithms respectively for cartier frequency offset coarse estimation and fine estimation. The algorithm for coarse estimation is based on the PRS that is only contained in DAB signal, while the algorithm for fine estimation is based on CP, which could also be used in other OFDM systems. Our simulation result shows that these two carrier frequency synchronization algorithms have good performance.