Advanced time frequency approaches in SMOTFS and OTFS for wireless system

Abstract: The fifth generation (5G) mobile communication system is looking forward to achieving much better spectral efficiency, higher mobility, and lower end-to-end latency in comparison with the fourth-generation (4G) system. To deal with the influence of the fast time-varying wireless mobile channels, orthogonal time frequency space (OTFS) modulation has been proposed. Orthogonal Time Frequency Space (OTFS) is a 2dimensional (2D) modulation technique designed in the delay-doppler domain which has the strong doppler-resilience over doubly selective channels and SM-OTFS system by the joint design of SM and OTFS modulation and to achieve the improved spectral efficiency and enhanced transmission reliability of the OTFS system when compared to OFDM and OTFS.

Keywords: Orthogonal Time Frequency Space (OTFS), Delay Doppler, spatial modulation-OTFS (SM-OTFS), Orthogonal Frequency Division Multiplexing (OFDM), Sixth generation(6G), Delay doppler domain (DD domain), Time frequency domain (TF domain)