（中国科学技术大学，中国 合肥 230026 ）
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