An Anti-Interference Synchronization for OFDM Systems Based on Scrambling Sequence

To improve the performance of the synchronization in OFDM systems in the presence of interference, a new synchronization algorithm based on scrambling sequence is proposed in this paper, which redesigns the training sequence with the constant amplitude zero auto-correlation (CAZAC) sequence and an extra scrambling operation. Compared with the traditional scrambling sequence-based algorithm, the simulations carried out both in AWGN and COST 207 4-path rural area (RA) channel show that the proposed synchronization algorithm can still maintain the sharper correlation peak, and achieve accurate symbol timing estimation and carrier frequency offset (CFO) estimation in the interference environment, with a lower out-of-band energy of the spectrum due to a new scrambling sequence. Furthermore, owing to the particularity of the component elements from the scrambling sequence, a low complexity implementation structure is presented here to realize the correlation function of the proposed algorithm with fewer hardware resources.