Abstract
Sixth-generation (6G) wireless networks are envisioned to provide global coverage for the intelligent digital society of the near future, ranging from traditional terrestrial to non-terrestri-al 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-dimension-al 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.
| Original language | English |
|---|---|
| Article number | 9508932 |
| Pages (from-to) | 136-144 |
| Number of pages | 9 |
| Journal | IEEE Wireless Communications |
| Volume | 28 |
| Issue number | 4 |
| Early online date | 6 Aug 2021 |
| DOIs | |
| Publication status | Published - Aug 2021 |
| Externally published | Yes |
Bibliographical note
Publisher Copyright:© 2002-2012 IEEE.
Funding
This work was supported in part by the Australian Research Council (ARC) Discovery Projects under Grant DP190101363, and in part by the Linkage Project under Grant LP170101196. L. Hanzo would like to acknowledge the financial support of the European Research Council’s Advanced Fellow Grant QuantCom (Grant No. 789028). The authors would like to thank the support from Telstra Corporation Ltd., particularly Dr. Paul G. Fitzpatrick, Dr. Taka Sakurai, and Mr. Paul Sporton for valuable discussions during this work.