Timing synchronization algorithm of OFDM symbols for mine through-the-earth communication system

In view of problem that existing timing synchronization algorithm of OFDM symbols has training sequence with complex structure and low timing accuracy, a timing synchronization algorithm based on linear frequency modulation sequence was proposed. The algorithm uses linear frequency modulation sequence and its negative conjugate sequence to constitute frames structure of sequence, so as to achieve the OFDM symbols timing synchronization. Matlab simulation results show that the synchronization algorithm has training sequence with sharper correlation peak, and can determine starting position of OFDM symbols more accurately. Finally, DSP chip was used to design a simple OFDM baseband communications system, and correction of the proposed synchronization algorithm was verified by consistency of sending data and receiving data.