The sixth-generation (6G) wireless networks are envisioned to provide a global coverage for the intelligent digital society of the near future, ranging from traditional terrestrial to non-terrestrial networks, where reliable communications in high-mobility scenarios at high carrier frequencies would play a vital role. In such scenarios, the conventional orthogonal frequency division multiplexing (OFDM) modulation, that has been widely used in both the fourth-generation (4G) and the emerging fifth-generation (5G) cellular systems as well as in WiFi networks, is vulnerable to severe Doppler spread. In this context, this article aims to introduce a recently proposed two-dimensional modulation scheme referred to as orthogonal time-frequency space (OTFS) modulation, which conveniently accommodates the channel dynamics via modulating information in the delay-Doppler domain. This article provides an easy-reading overview of OTFS, highlighting its underlying motivation and specific features. The critical challenges of OTFS and our preliminary results are presented. We also discuss a range of promising research opportunities and potential applications of OTFS in 6G wireless networks.
@article{arxiv.2010.03344,
title = {Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform},
author = {Zhiqiang Wei and Weijie Yuan and Shuangyang Li and Jinhong Yuan and Ganesh Bharatula and Ronny Hadani and Lajos Hanzo},
journal= {arXiv preprint arXiv:2010.03344},
year = {2021}
}
Comments
9 pages, 6 figures, submitted to the possible magazine