Improved Algorithm for Timing Synchronization of OFDM Systems Based on ZC Sequences

Synchronization technique is the key to determine the performance of OFDM (Orthogonal Frequency Division Multiplexing) system, the wrong timing synchronization point will lead to serious inter symbol interference (ISI) and inter carrier interference (ICI) in OFDM system. In this paper, we analyze three traditional classical algorithms for timing synchronization based on cyclic prefixes, and design an improved Park algorithm for the higher sub-peaks in the Park algorithm. The training sequence in Park's algorithm is constructed with a ZC (Zadoff-Chu) sequence with better autocorrelation, and the autocorrelation function is divided into two parts by using the weighting property to increase the weights of each part, and finally the peaks of the timing metric function are captured. Theoretical analysis and simulation results show that compared with the traditional Park algorithm, the algorithm proposed in this paper has higher timing synchronization accuracy and better synchronization effect.