Study on OFDM Symbol Timing Synchronization Algorithm

OFDM technology has become the core technology of the next generation mobile communication system because of the high bandwidth efficiency, the strong ability to resist inter-carrier interference and anti-channel interference. However, because OFDM system is a multicarrier modulation system, the system will be very sensitive to its synchronization errors. Synchronization estimation is an important part of the OFDM system. Based on the research of Schmidl & Cox and Minn synchronization algorithms, this paper proposed an improved timing synchronization algorithm which adopted the training sequence, and the timing synchronization estimation function has been optimized for this improved algorithm. The peak platform issue of Schmidl & Cox algorithm, the no sharp peak issue of Minn (1) algorithm and the vice peak issue of Minn (2) algorithm were eliminated based on the improved algorithm. The simulation results showed that the timing judgment curve of the improved algorithm had a very sharp peak at the timing synchronization position. Compared with the conventional algorithm, the timing synchronization performance of the improved algorithm was better. The overall performance of OFDM system was improved.