刘梦晓，周晶，张文逸
（中国科学技术大学，中国 合肥 230026 ）
摘要：分析了正交时频空（OTFS）调制的关键问题和研究进展，探讨了基于多载波体制的OTFS与正交频分复用（OFDM）的关系，并在超高移动性信道中仿真比较了二者的性能。数值结果表明，OTFS对信道时变引入的强多普勒效应展现了良好的性能稳健性，相比于OFDM能够更直接地获取分集增益。因此，OTFS有望在支持超高移动性信道可靠通信方面发挥重要作用。
关键词：OTFS；延迟-多普勒信道；OFDM；超高移动性；分集增益
Orthogonal Time Frequency Space Modulation for Channels with Very High Mobility
LIU Mengxiao, ZHOU Jing, ZHANG Wenyi
(University of Science and Technology of China, Hefei 230026, China)
Abstract: The key issues and research progress of orthogonal time frequency space (OTFS) are introduced. The relationship between multicarrier-based OTFS and orthogonal frequency division multiplexing (OFDM) is analyzed, and their performances over very high mobility channels are compared via simulation. Numerical results demonstrate that the robustness of the performance of OTFS under strong Doppler effects in time-varying channels, and the diversity gain can be obtained more directly than the OFDM. Therefore, OTFS has the potential of playing an important role in achieving reliable communications under very high mobility.
Keywords: OTFS; Delay-Doppler channel; OFDM; very high mobility; diversity gain
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