一种LTE系统主同步重叠与分段联合检测算法  

A LTE system primary synchronization fast correlation algorithm with the method of combining overlapping and section

作　　者：田增山[1] 徐建[1] 李伟光 

机构地区：[1]重庆邮电大学重庆市移动通信技术重点实验室,重庆400065

出　　处：《电子技术应用》2017年第12期92-95,99,共5页Application of Electronic Technique

基　　金：国家自然科学基金(61301126);重庆市基础与前沿研究计划(cstc2015jcyj BX0065);重庆邮电大学青年科学研究项目(A2013-31)

摘　　要：同步作为小区搜索的重要部分,对小区的选择和响应时延等有着决定性的作用。在长期演进(Long Term Evolution,LTE)系统中主同步直接影响辅同步、全双工模式的识别,以至整个通信系统。结合主同步信号(Primary Synchronization Signal,PSS)良好的互相关性,给出了一种基于FFT快速相关的改进算法,采用重叠和分段联合检测的方式,并且通过数据循环后移保证序列完整性,来实现对半帧数据的快速搜索。理论分析和仿真表明,该算法能够有效降低计算量和同步时间。实验表明,该算法在LTE系统中能够准确高效地实现PSS序列的快速同步。As an important part of cell search, synchronization plays a decisive role to cell selection and time delay of response.In LTE（ Long Term Evolution） system, primary synchronization effects secondary synchronization and the recognition of full duplex mode directly. Combining with the good correlation of primary synchronization signal, this paper presents an improved algorithm based on FFT fast correlation to realize the search for half frame data with the method of combining overlapping and section, and make the data cycle back to guarantee sequence integrity. Theoretical analysis and simulation show that the algorithm can effectively reduce the amount of calculation and the synchronization time. Experiments show that the algorithm can achieve accurate and effi-cient synchronization of PSS sequence in the LTE system.

关 键 词：LTE系统 主同步 FFT快速相关 重叠分段联合 循环后移 

分 类 号：TN929.5[电子电信—通信与信息系统]