LTE系统中小区搜索定时同步算法研究

Research of cell search timing synchronization algorithm in LTE system

介绍了LTE系统主同步信号的产生,提出了一种新的符号定时同步算法。利用主同步信号在时域具有镜像对称的特性,结合分段相关同步算法的优点,以及对接收端信号进行累积处理的方法,有效地提高了算法的抗频偏性能和同步性能。同时,将3组本地PSS序列相加后在与接收信号序列进行互相关,有效地减小了算法的运算量并能快速实现下行定时同步。理论分析和仿真实验结果表明,所提出的算法在AWGN信道下具有良好的性能,能够满足LTE系统对同步性能的要求。

This paper introduced the production of the LTE system primary synchronization signal,and proposed a new symbol timing synchronization algorithm. Use primary synchronization signal＇s mirror symmetry characteristics in time domain, combined with the advantages of partial correlation synchronization algorithm, and the receiving signal accumulation processing methods, the algorithm performance of anti frequency offset and synchronization are improved effectively. At the same time, add up three groups of local PSS sequence and doing correlation with receive signal sequence can reduce the calculation of algorithm effectively and realize the downlink timing synchronization fast. Both the theory analysis and simulation results show that the proposed algorithm has good performance in AWGN channel, and can satisfy the synchronization performance demand by cell search in LTE system.