A Time Frequency Synchronization Approach for OFDM Short Burst Signals

The orthogonality of sub-carriers is often destroyed by the deviation of both timing and carrier synchronization, which affects the quality and efficiency of wireless communication. In this paper, we propose a time-frequency synchronization approach for short-burst orthogonal frequency division multiplexing (OFDM) systems. Firstly, a training sequence based on Zadoff-Chu sequence is constructed, which effectively eliminates the sub-peak interference and improves the timing synchronization performance in low signal-to-noise ratio and multipath channels. then, a timing synchronization algorithm and frequency offset estimation algorithm based on double Zadoff-Chu sequence are proposed. Finally, simulations demonstrate that the proposed approach achieves accurate timing synchronization and frequency offset estimation, and has better performance than the state-of-the-art methods in the fast synchronization of short-burst OFDM signals.