关键词: 循环前缀, 符号同步, 连续导频, 散布导频

Abstract: The influence of symbol synchronization on receiver performance is analyzed and a synchronization algorithm of improving Inter-Symbol-Interference（ISI） caused by multi-path effects is proposed.By shortening the length of correlating operation and adding the number of received OFDM symbols，it ensures the symbol time that is located in the middle of the maximal multi-path delay and the symbol time.For the rotation gene caused by symbol time errors，its estimation is given by pilot sequence.The simulation results in the mode of DVB-SH 2K show that the proposed method can precisely estimate the symbol time.

Key words: cyclic prefix, symbol synchronization, continual pilot, scattered pilot