LEO-5G下行时频同步算法研究  

Research on LEO-5G Downlink Time-frequency Synchronization Algorithm

作　　者：汪文军 WANG Wenjun(Gongcheng Management Consulting Co.,Ltd.,Guangzhou 510000,China)

机构地区：[1]公诚管理咨询有限公司,广东广州510000

出　　处：《数字通信世界》2024年第8期61-63,66,共4页Digital Communication World

摘　　要：该文深入探讨了低轨卫星(LEO)与第五代移动通信技术(5G)相结合的下行链路时频同步算法。在分析该融合系统物理广播信道(PBCH)的链路结构以及下行时频同步的整体框架基础上,提出了一项针对主同步信号(PSS)检测的改进算法,旨在实现对粗略频率偏差的估计。随后通过辅同步信号(SSS)的相关性分析以及小区特定参考信号(CRS)的导频序列,进一步细化了频率偏差的估计,并确定了下行时频同步算法。通过仿真实验下行时频同步的FPGA模块成功实现了消息指示块(MIB)的解析,正确率高达83.07%,满足算法设计目标要求。This article delves into the downlink time-frequency synchronization algorithm that combines Low Earth Orbit(LEO)satellites with the fifth generation mobile communication technology(5G).On the basis of analyzing the link structure of the physical broadcast channel(PBCH)of the fusion system and the overall framework of downlink time-frequency synchronization,an improved algorithm for detecting the main synchronization signal(PSS)is proposed,aiming to estimate the rough frequency deviation.Subsequently,the estimation of frequency deviation was further refined through correlation analysis of auxiliary synchronous signals(SSS)and pilot sequences of cell specific reference signals(CRS),and the downlink time-frequency synchronization algorithm was determined.Through simulation experiments,the FPGA module for downlink time-frequency synchronization successfully achieved the parsing of the Message Indication Block(MIB),with an accuracy rate of up to 83.07%,meeting the algorithm design objectives.

关 键 词：低轨卫星通信系统 算法研究 下行时频同步 

分 类 号：TN927.2[电子电信—通信与信息系统]