一种利用PN序列的OFDM频率同步

提出了一种利用PN序列进行OFDM频率估计的新方法。在多径信道中，该方法由于利用了多径信号，提高了频率估计精度。仿真结果显示，其频率估计精度能满足Rayleigh信道下中低速运动时OFDM系统的要求。优点是，当合适选择参数，频率估计范围可达十几个子载波间隔，并且频率同步估计范围和精度可以调节。
关 键 词 正交频分复用; 频率同步; PN序列; 衰落信道

Abstract In this paper we proposed a new OFDM frequency synchronization method by using PN sequence. In multi-path channel, the frequency estimation precision of this method is better than conventional method for it using multi-path signals. The simulation indicates the proposed method can satisfy the demand of OFDM system at moderate moving rate in Rayleigh channel. One of the advantages of this method is that its frequency estimation range can be dozens of subcarrier spacing when the parameters are properly designed. And the frequency estimation range and precision can be adjusted.
Key words orthogonal frequency division multiplexing; frequency synchronization; PN sequence; fading channel