| 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。 |
| 关键词: 卫星通信 5G物理层 时频同步 抗干扰 扩频 |
| DOI：10.20079/j.issn.1001-893x.230511001 |
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| 基金项目: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) |
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| An Anti-amming Time-requency Synchronization Algorithm for Satellite 5G Communication |
| ZHANG Ruixin,CUI Gaofeng,LI Feng,WANG Weidong |
| (1.School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100876,China;2.Systems Engineering Institute of Academy of Military Sciences,Beijing 100166,China) |
| Abstract: |
| In order to improve the anti-amming 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-tep joint anti-amming time-requency 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-imensional 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-o-ignal ratio interference,and their performance is better than that of traditional algorithms under low signal-o-oise ratio. |
| Key words: satellite communications 5G physical layer time-requency synchronization anti-amming spread spectrum |
