摘要
符号定时同步是5G系统初始小区搜索的关键步骤,针对传统定时同步算法抗频偏性能差、计算复杂度高的问题,提出一种适用于5G系统的主同步信号(PSS)定时同步改进算法。在分段相关算法的基础上,对PSS序列预置归一化频偏,利用PSS序列的共轭对称特性将其分段处理后预存于终端,结合卷积和重叠保留分块方法实现各分段相关窗的快速相关,并对分段相关值作时延累加后进行门限判决,从而完成定时同步和粗频偏的联合检测。仿真结果表明,与差分相关算法、分段相关算法相比,该算法能够有效提升系统的抗频偏性能,降低计算复杂度,满足5G系统对定时同步的要求。
Symbol timing synchronization is a key step in the initial cell search of 5G systems.To address the poor frequency offset resistance and high calculation complexity of traditional timing synchronization algorithms,this paper proposes an improved timing synchronization algorithm based on Primary Synchronization Signal(PSS)for 5G systems.Based on the piecewise correlation algorithm,the proposed algorithm presets the normalized frequency offset for the PSS sequence,and utilizes the conjugate symmetry characteristic of the PSS sequence to pre-store it in the terminal after piecewise processing.In addition,the algorithm combines the convolution and overlap-preserving blocking methods to achieve fast correlation of the correlation windows of each segment,and then makes a threshold judgment after accumulating correlation value delays to complete the joint detection of timing synchronization and coarse frequency offset estimation.Simulation results show that,compared with the differential correlation algorithm and the piecewise correlation algorithm,the proposed algorithm effectively improves the anti-frequency offset performance of the system,reduces the computational complexity,and meets the timing synchronization requirements of 5G systems.
作者
王宗伟
石晶林
冯雪林
勾志杭
WANG Zongwei;SHI Jinglin;FENG Xuelin;GOU Zhihang(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Beijing Key Laboratory of Mobile Computing and Pervasive Device,Beijing 100190,China;Wireless Communication Technology Research Center,Institute of Computing Technology,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100190,China)
出处
《计算机工程》
CAS
CSCD
北大核心
2020年第12期27-35,共9页
Computer Engineering
基金
中科院弘光专项“空天地一体化网络卫星移动通信终端芯片研发及产业化”(KFJ-HGZX-002)。
关键词
5G系统
定时同步
分段相关算法
频偏预置
重叠保留
5G systems
timing synchronization
segment correlation algorithm
frequency offset presetting
overlapping reservation
