Abstract: In wireless environment, the accuracy of timing synchronization in an OFDM system would be affected by multi-path. For the sake of solving this problem, a new method and its improved one based on the cyclic prefix are proposed in this paper, which uses the separate block of the correlation between the cyclic prefix and its duplicated part which is different from the continuous correlation or point correlation in the existing methods. The proposed methods could obtain the time delay and the length of the cyclic prefix, with their deviation and simulation given. It is shown that the proposed methods have higher precision and lower complexity compared with the existing methods. Also, they could obtain the time delay of the channel and the length of the cyclic prefix.

Key words: orthogonal frequency division multiplexing(OFDM), timing synchronization, cyclic prefix, multi-path