双导频载波恢复算法设计

Algorithm Design of Dual-pilot Carrier Recovery

针对国家地面数字电视标准GB20600-2006,提出一种可应用于单载波模式的双导频载波恢复算法。该算法充分利用了单载波模式下双导频的特点,通过两个独立的锁频锁相环分别完成频偏估计,并采用环路加权求和的方式对抗多径干扰所导致的导频衰落。仿真证明,算法在多径信道条件下具有较好的性能。

A new dual-pilot carrier recovery algorithm, which can be applied to the single-carrier mode in national DTTB （Digital Terresting Television Broadcasting） Standard（GB 20600-2006）, is presented in this paper. The algorithm takes full advantage of dual-pilot under single-carrier mode, and utilizes a couple of absolute FPLL（Frequency and Phase Lock Loop） to estimate frequency offset. Furthermore, this algorithm adopts loop weighted adding to resist pilot fading caused by muhi-path interference. The simulation results prove that the algorithm has good performance in muhi-path channel.