基于时延-多普勒域信号稀疏性的OTFS帧同步算法  

Frame synchronization algorithm based on delay-Doppler domain signal sparsity for OTFS system

作　　者：陈杨 杨海艳 程恺英 刘恒[2] 马征[2] CHEN Yang;YANG Haiyan;CHENG Kaiying;LIU Heng;MA Zheng(Southwest China Institute of Electronic Technology,Chengdu 610036,China;Key Lab of Information Coding and Transmission,Southwest Jiaotong University,Chengdu 610031,China;Unit 93216 of PLA,Beijing 100085,China)

机构地区：[1]中国西南电子技术研究所,四川成都610036 [2]西南交通大学信息编码与传输实验室,四川成都610031 [3]中国人民解放军93216部队,北京100085

出　　处：《电信科学》2024年第5期49-61,共13页Telecommunications Science

摘　　要：针对单导频结构的正交时频空(orthogonal time frequency and space,OTFS)调制系统接收信号特性,提出了一种基于时延-多普勒域的帧同步算法,该算法无须在发送信号中插入前导码,而是利用单导频OTFS帧结构特征,通过计算接收信号在时延-多普勒域的稀疏度并结合单导频位置的变化对帧同步位置进行判断。仿真实验结果表明,所提方案在高信噪比下有一定性能优势,且随着移动速度的增加,所提方案相较于对比方案的性能优势更加明显,因此,更适合应用于高速甚至超高速移动通信场景中。A frame synchronization algorithm based on delay-Doppler domain was proposed for orthogonal time frequency and space(OTFS)modulation systems with a single pilot structure.The signal sparsity and the relative position change of the pilot in the delay-Doppler domain of the received OTFS signals were utilized to identify the frame synchronization location.Simulation results were presented to demonstrate that the proposed scheme outperformed the classic synchronization scheme based on the preamble,which was commonly used in orthogonal frequency division multiplexing(OFDM)systems,in terms of lower synchronization failure rate under high signal-to-noise ratio(SNR)regions.Additionally,the proposed scheme exhibited greater performance advantages over the preamble-based scheme as the moving speed increases,making it a more suitable option for high-speed or even ultra-high-speed mobile communication scenarios.

关 键 词：正交时频空调制 单导频结构 稀疏性 帧同步 

分 类 号：TN92[电子电信—通信与信息系统]