OFDM系统中基于时域过采样的频率同步算法

The Frequency Synchronization Algorithm Based on the Time Domain Oversampling in OFDM System

针对正交频分复用OFDM(Orthogonal Frequency Division Multiplexing)系统对频率偏移极其敏感的问题,研究了基于训练序列的Schmidl频偏估计算法,提出了一种基于时域过采样的频率同步算法。通过软件仿真,得出结论,提出的算法在信噪比高的情况下能基本不失真的复原发端数据,在信噪比低的情况下优势非常明显,发送端发送的原始数据能够被很好地复原出来,同时该算法在频率资源利用率方面,在信号传输速率方面,都比原有算法有所提高,在现实中实现方便。

In order to solve the problem that Orthogonal Frequency Division Multiplexing(OFDM)is sensitive to frequency offset,after studying the Schmidl frequency offset estimation algorithm based on training sequence,the frequency synchronization algorithm based on time-domain oversampling is proposed in this paper.The simulation results show that the proposed algorithm can recover the original data of the sender in the case of low SNR.And the algorithm not only can improve the utilization rate of the frequency resource and signal transmission rate,but also it is easy to implement.