Simple time synchronization algorithm based on IEEE 802.11a standard

OFDM;  training sequences;  Time synchronization

Time synchronization is one of the key technologies of 0FDM system, based on the training sequence structure of IEEE 802.11a standard, a simple correlation time synchronization algorithm is proposed by improving the correlation function and decision conditions. After the improvement of the autocorrelation function, the fluctuation range of the autocorrelation function value is significantly reduced, which provides a possibility for the selection of the best decision threshold. At the same time, by increasing the judgment width, the relevant algorithm can also achieve good results when the frequency offset is large. The simulation results show that when the frame detection probability is 90% and the frequency offset is 200 kHz, the SNR of the proposed algorithm is improved by 8 dB compared with the traditional correlation algorithm.