联合循环前缀和Pilot的OFDM系统定时同步方法

提出了一种联合循环前缀和Pilot的定时同步方法，并将其用于高速传输的无线移动正交频分复用（OFDM）系统．算法首先利用循环前缀定时函数得到时偏的估计范围，然后在估计范围内利用导频定时函数得到时偏的精确估计．由于不需要加入训练序列，提出的定时同步方法最大限度地节省了系统开销，提高了系统的频带利用率，而且利用导频序列进行定时同步可以有效地克服符号间干扰的影响．仿真结果表明，该算法能够改进时频估计在多径信道下的精度，提高系统在多径衰落信道下的性能．

Combined cyclic prefix and pilot frame synchronization method for OFDM systems

Symbol timing algorithm was proposed by combining cyclic prefix(CP) and Pilot.First,coarse estimation of timing offset was given by CP timing matrix.Then,fine estimation of timing offset was provided by Pilot timing matrix.The proposed algorithm can combat with inter-symbol interference (ISI) introduced by multipath without increasing the overhead.Simulation results show that the proposed algorithm can improve the accuracy of the timing offset estimator and the bandwidth efficiency and enhances performance.