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The current study synchronization algorithm based on cyclic prefix, requirements of cyclic prefix length cannot be greater than OFDM the 1/4 of the symbol timing synchronization, otherwise, the system timing synchronization error will be significant. Aiming at this problem, this paper again by changing the training sequence structure, puts forward the improved synchronization algorithm, consider the impact of the correlation coefficient on timing synchronous, by an estimate of the correlation coefficient, reducing the factors that affect the performance of the ML timing synchronization algorithm; in the frequency offset estimation, using the set of related ideas to eliminate the drawbacks of ML algorithm performance in multipath channel low, through the simulation verified the effectiveness of the algorithm. Keywords-OFDM; synchronization; cyclic prefix I. IN T RODUCTION By using the method of inserting the training sequence, the system t iming synchronization can be achieved very good results. Regardless of the SC algorithm or M inn algorithm and Park algorith m, are increasing at least one data symbol sequence of the same length between the OFDM data symbols and cyclic prefix, broadband and power of the system has a lot of waste, the effectiveness of the system is also affected by a lot (1). If not through the insertion sequence help system to achieve timing synchronization, then only using the cyclic prefix informat ion of symbols information to achieve. The earliest use of cyclic prefix to achieve timing synchronization system is Jan-Jaap van de Beek, he proposed maximu m likelihood estimation(ML algorithm) (2)in 1997, M L algorithm is mainly using OFDM symbol cyclic prefix information and maximu m likelihood estimate method to realize the combination of system synchronization, so there is no need to add any sequence to help. ML algorithm solve the problem of the validity of the system, it has become a classic algorithm based on cyclic prefix algorithm. However, the current study synchronization algorithm based on cyclic prefix, requirements of cyclic prefix length cannot be greater than OFDM the 1/4 of the symbol timing synchronization , otherwise, the system timing synchronization error will be significant. Aiming at this problem, this paper again by changing the training sequence structure, and puts forward the improved synchronization algorith m (3). Solve the problem in improving system performance basis. k k k n s n s

OFDM Synchronization Improved Algorithm Based on Cyclic Prefix