OFDM系统中帧同步技术研究

在分析S＆C算法的基础上，提出一种基于新训练序列的改进的正交频分复用（OFDM）同步方法。改进后的算法仍使用两个训练符号，以训练符号本身的强自相关性来消除定时同步中的峰值平台问题，并将训练符号的循环前缀（CP）置为0，以尽量消除CP对定时同步的影响。新的训练符号可直接在时域估计出栽波频偏。改进后的算法在定时同步的准确性...

Study of frame synchronization technology in OFDM system

On the basis of the study of the S＆C algorithm, an advanced OFDM synchronization algorithm based on a new training sequence is proposed. The advanced algorithm still uses two training sequences, and can eliminate the plateau of correlation peak in the timing synchronization by the strong autocorrelation character of training sequence. Since the timing metric function is usually affected by the cyclic prefix, CP is set to 0. The new training sequence is proposed to estimate the timing and the frequency offset error jointly in time domain. It is much better than the S＆C algorithm in timing synchronization correction. Simulation result is also given in the MATLAB environment by using Monte Carlo. The simulation result shows that in the Ganssian white noise and multi-path channel, the algorithm of the strong correlation can achieve more precise synchronization, the false alarm rate is less than 5‰.