This paper gave detailed design for LTE cell search process, including timing synchronization, frequency synchronization, sector ID, and cell group ID detection. Proposed a maximum likehood algorithm based on PSS to provide a precise fractional frequency offset estimation for UE, the algorithm could accurately estimate the fractional frequency offset for frequency synchronization. Theoretical analysis and simulation results show that the performance of the algorithm designed under AWGN and multipath channel is good, with high precision for timing and frequency offset estimation.%设计了详细的LTE系统小区搜索流程,包括定时同步、频率同步、扇区ID和小区纽ID检测等,其中针对频率同步提出了一种基于主同步信号(PSS)的最大似然算法,为用户终端(UE)提供了精确的小数倍频偏估计.该算法能准确估计出频率同步时小数倍频率偏移.理论分析与仿真结果表明,该算法在AWGN和多径信道下性能良好,具有较高的定时和频偏估计精度.
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