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该算法通过联合多个正交频分复用(OFDM)符号对定时同步参数进行估计。该算法不需要额外的数据辅助,主要利用接收信号循环前缀的相关性,通过计算接收信号的联合相关函数,并利用搜索其峰值来实现OFDM信号的定时同步。该算法分为定时粗估计和定时细估计,利用定时细估计能精确进行OFDM信号的定时同步。仿真结果表明该算法在低信噪情况下估计精度较高,适合实际信号的应用。
The algorithm estimates the timing synchronization parameters by combining multiple orthogonal frequency division multiplexing (OFDM) symbols. The algorithm does not require additional data aided mainly by the correlation of the received signal cyclic prefix, by calculating the joint correlation function of the received signal, and using the peak search to achieve the OFDM signal timing synchronization. The algorithm is divided into coarse timing estimation and fine timing estimation, and the timing fine estimation can accurately carry out the timing synchronization of OFDM signals. The simulation results show that the proposed algorithm has high estimation accuracy under low signal-noise conditions and is suitable for the application of real signal.