基于训练序列的时域OFDM载波同步算法

在研究单次频偏累积相偏估计的基础上,详细分析了2次独立的频偏累积相偏估计带来的频偏捕获范围的提高.并在此基础上提出一种基于训练序列的载波同步算法.这种算法利用时域2次独立的不同分辨力的相偏估计,解决了单次估计可能存在的相位模糊问题,从而实现了大频偏载波同步.通过理论分析给出了这种算法的性能,并通过仿真进行了验证.由于完全在时域进行估计,和其他大频偏载波同步算法相比,这种算法计算量小,且实现简单.

Training sequence based carrier frequency synchronization method for OFDM system

Based on the study of single estimation of phase-offset induced by frequency offset, two independent phase-offset estimations which could expand the capture range of frequency offset was thoroughly analyzed, and a training sequence based carrier frequency synchronization method for orthogonal frequency division multiplexing(OFDM) system was proposed. The method take the advantage of two independent phase-offset estimations to remove the potential phase ambiguity existed in a phase-offset estimation, so as to recover the carrier frequency in a wide range. Theoretical analysis and simulation tests were provided to evaluate the performance of the method. Since the frequency offset is estimated in time domain, this method is easier to implement with much less complexity comparing with other wide range carrier frequency recovery methods.