提出了一種利用PN序列進行OFDM頻率估計的新方法。在多徑信道中，該方法由于利用了多徑信號，提高了頻率估計精度。仿真結果顯示，其頻率估計精度能滿足Rayleigh信道下中低速運動時OFDM系統的要求。優點是，當合適選擇參數，頻率估計范圍可達十幾個子載波間隔，并且頻率同步估計范圍和精度可以調節。
關 鍵 詞 正交頻分復用; 頻率同步; 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