卫星5G通信抗干扰时频同步算法  

An Anti-jamming Time-Frequency SynchronizationAlgorithm for Satellite 5G Communication

作　　者：张瑞欣 崔高峰[1] 李峰 王卫东[1] ZHANG Ruixin;CUI Gaofeng;LI Feng;WANG Weidong(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;Systems Engineering Institute of Academy of Military Sciences,Beijing 100166,China)

机构地区：[1]北京邮电大学电子工程学院,北京100876 [2]军事科学院系统工程研究院,北京100166

出　　处：《电讯技术》2024年第6期857-864,共8页Telecommunication Engineering

基　　金：国家自然科学基金资助项目(62171052,61971054);上海市青年科技启明星计划资助项目(20QB1405300)。

摘　　要：为了提高卫星通信系统的抗干扰和抗频偏能力,提出了一种在5G物理层波形中融入扩频技术的传输波形设计方案和辅同步信号(Secondary Synchroniztion Singnal, SSS)辅助主同步信号(Primary Synchronization Signal, PSS)多步联合抗干扰时频同步算法。该算法的实现分为3步:首先采用SSS辅助PSS二维时间同步得到粗同步点;然后根据粗同步点进行整数倍和小数倍频偏估计与补偿,其中小数倍频偏估计分为PSS扫频粗频偏估计和SSS辅助PSS互相关精频偏估计;最后对频偏补偿后的接收序列再次进行精时间同步和频偏补偿。仿真结果表明,所提设计方案和同步算法可以抗干信比为12 dB的干扰,并且在低信噪比下的性能优于传统算法。In order to improve the anti-jamming and frequency offset resistance of satellite communication system,a transmission waveform design scheme incorporating spread spectrum technology into the 5G physical layer waveform and a multi-step joint anti-jamming time-frequency synchronization algorithm with secondary synchronization signal(SSS)auxiliary primary synchronization signal(PSS)are proposed.The implementation of this algorithm is divided into three steps:Firstly,SSS assisted PSS two-dimensional time synchronization is used to obtain coarse synchronization points.Then,according to the coarse synchronization point,integer and decimal frequency offset estimation and compensation are performed.The decimal frequency offset estimation is divided into PSS scanning coarse frequency offset estimation and SSS assisted PSS cross correlation fine frequency offset estimation.Finally,precise time synchronization and frequency offset compensation are performed again on the received sequence after frequency offset compensation.The simulation results show that the proposed design scheme and synchronization algorithm can resist 12 dB jamming-to-signal ratio interference,and their performance is better than that of traditional algorithms under low signal-to-noise ratio.

关 键 词：卫星通信 5G物理层 时频同步 抗干扰 扩频 

分 类 号：TN927.2[电子电信—通信与信息系统]