基于异周期循环前缀的OFDM频偏估计方法

Heter-cycle abutted cyclic prefix based OFDM carrier frequency synchronization

设计了一种具有异周期毗邻结构的新型循环前缀(Heter-cycle abutted CP,HCA-CP),并提出了相应的OFDM频偏估计算法。该异周期毗邻结构循环前缀由CP1和CP2两部分构成,使OFDM符号具有双周期特征。通过引入较短的CP1,牺牲极少的资源,可以有效克服现有频偏估计方法中的固定频偏估计范围的缺陷,同时具有频偏估计范围大,精度高的特点。

This paper proposes a heter-cycle abutted CP structure and designs a two-step OFDM cartier frequency calibration algorithm. The new cyclic prefix is made up of two parts that are replica of the leading and ending part of the OFDM symbol respectively, CP1 and CP2, providing different frequency estimation range and precision. By introducing a short CP1, it proposes algorithm which achieves larger frequency estimation range while obtaining fine frequency calibration.