Orthogonal Time Frequency Space (OTFS) is a 2D modulation technique that transforms the information carried in the Delay-Doppler coordinate system.
The information is transformed in a similar time-frequency domain as utilized by the traditional schemes of modulation such as TDMA, CDMA, and OFDM.
[14][15] Iterative Rake decision feedback equalization achieves equivalent performance to message passing with a much lower complexity that is independent of the modulation size.
[27][28] High mobility scenarios, such as fast-moving vehicles or dynamic wireless networks, introduce severe channel impairments due to rapid time-varying fading, Doppler shift, and time dispersion.
[29][30] OTFS addresses the challenges posed by high mobility scenarios by employing time and frequency transformations.
This transformation turns the time-varying channel into stable flat fading, improving signal reception and reducing packet loss significantly.
The reduced packet loss and improved spectral efficiency in OTFS lead to fewer retransmissions, resulting in lower power consumption and increased battery life in mobile devices.
arXiv:2109.06047. https://amsayeed.files.wordpress.com/2021/09/otfs_vs_stf_gcom21_final.pdf K. Liu, T. Kadous, and A. Sayeed, Orthogonal Time-Frequency Signaling Over Doubly Dispersive Channels, IEEE Transactions on Information Theory, pp.