高速移动环境下OFDM系统载波同步

Carrier Frequency Synchronization for OFDM in High Mobile Environment

在分析OFDM系统载波频偏信号模型的基础上,提出了基于单OFDM前导符号载波同步的高效算法。将基于前导符号相关的方法和基于循环前缀相关的方法融合,应用信道估计和均衡补偿信道中的残留频偏,从链路级研究易于实现的载波同步算法,在高速无线多径Rayleigh信道下,相对频偏ε<±0·5的条件下车速120km/h时获得十分理想的载波同步结果。

Based on analyzing OFDM signal model of carrier frequency offset, an efficient algorithm of carrier frequency synchronization using one OFDM preamble symbol is presented. The cycle prefix correlation is combined with the preamble symbol correlation in the algorithm. The residual cartier frequency offset in the channel is compensated using channel estimation and equalization. This method is investigated into physical link implementation for carrier frequency estimation and synchronization. Simulation results show that the system attains perfect performance in carrier frequency synchronization on wireless multipath Rayleigh channel with vehicle velocity 120 km/h.