一种基于训练序列的OFDM时频同步新算法

Novel timing and frequency synchronization algorithm for OFDM systems based on training sequence

针对正交频分复用(orthogonal frequency-division multiplexing,OFDM)系统性能对同步偏差的敏感性,提出了一种新的基于训练序列的OFDM联合定时和频率同步算法。基于新设计的训练序列结构,提出了新的定时度量函数,同时推导了小数倍频偏估计算法。新定时同步算法有效地克服了传统算法中的定时缺陷,新频偏估计算法具有和Schmidl算法相同的估计方差。理论分析与仿真结果表明,新算法在多径信道下具有较好的鲁棒性。

To overcome the serious influence of synchronization offset on OFDM systems, a novel timing and frequency synchronization algorithm for OFDM systems based on training sequence is proposed. The new timing metric and the estimation algorithm of fractional frequency offset are deduced based on the new structure of training sequence. The proposed timing algorithm eliminates the defect in conventional methods effectively, and the proposed method of frequency offset estimation has the same variance as Schmidl algorithm. Theoretical analysis and simulation results show that the proposed algorithm has good performance in both AWGN and multi-path fading channels.