在未来的通信网络中,被广泛期待的第6代移动通信系统(The Sixth Generation of Mobile Communica-tions System,6G)技术将面临诸多挑战,其中包括在高速移动场景下的超高可靠通信问题.正交时频空间(Ortho-gonal Time Frequency Space,OTFS)调制技术克服了传统通信系统在高速移动环境下多径和多普勒效应的影响,为实现 6G 超高可靠通信提供了新的可能性.该文首先介绍了OTFS的基本原理、数学模型、干扰与优势分析.然后,归纳分析了OTFS技术在同步、信道估计、信号检测技术上的研究现状.接着,从车联网、无人机、卫星通信、海洋通信4个典型应用场景分析了OTFS的应用趋势.最后,从降低多维匹配滤波器、相位解调和信道估计、硬件实现的复杂度和提高对时频资源的高度利用4个角度探讨了未来研究OTFS需要克服的困难和挑战.
6G New Time-delay Doppler Communication Paradigm:Technical Advantages,Design Challenges,Applications and Prospects of OTFS
In the future communication network,the sixth generation mobile communication system technology(6G),which is widely expected,will face many challenges,including the issue of ultra-reliable communication in high-speed mobile scenarios.Orthogonal Time Frequency Space(OTFS)modulation technology overcomes the multi-path and Doppler effects of traditional communication systems in high-speed mobile environments,and provides a new possibility for realizing 6G ultra-reliable communication.This paper first introduces the basic principle,mathematical model,interference and advantage analysis of OTFS.Then,the research status of OTFS technology in synchronization,channel estimation and signal detection is summarized and analyzed.Subsequently,the application trend of OTFS is analyzed from four typical application scenarios of vehicle networking,unmanned aerial vehicle,satellite communication and marine communication.Finally,the difficulties and challenges to be overcome in future OTFS research are discussed from four aspects:reducing multi-dimensional matching filter,phase demodulation and channel estimation,hardware implementation complexity and improving the high utilization of time-frequency resources.
The sixth generation of mobile communications systemOrthogonal Time Frequency Space(OTFS)Delay-doppler domainSynchronizationChannel estimationSignal detection
万方数据
维普
