Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform

By Zhiqiang Wei, Weijie Yuan, Shuangyang Li, Jinhong Yuan, G. Bharatula, Ronny Hadani, Lajos Hanzo. IEEE wireless communications, 2021

673 citations recorded by the source corpus.

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.

Subfields: Electrical and Electronic Engineering

View Paper: https://www.semanticscholar.org/paper/136a98b980e7d24f987bb179365380ff959eaa5d

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Electrical and Electronic Engineering

Citations in the corpus

Terahertz Band Communication: An Old Problem Revisited and Research Directions for the Next Decade (2021, methodology): “Third, a new modulation technique named orthogonal time frequency space (OTFS) was recently proposed to address high Doppler spread in doubly selective channels [175].”
Off-grid Channel Estimation with Sparse Bayesian Learning for OTFS Systems (2021, background): “I. INTRODUCTION Future wireless systems are envisioned to enable a wide range of emerging mobile applications, such as low-earth-orbit satellites (LEOS), autonomous cars, in-vehicle infotainment, and unmanned aerial vehicles (UAV) [2].”
Integrated Sensing and Communication-Assisted Orthogonal Time Frequency Space Transmission for Vehicular Networks (2021, methodology): “The coordinates of the vehicles are initialized at [ 30 , 50] T , [20 , 50] T , [5 , 20] T , and [40 , 20] T .”
A Primer on Rate-Splitting Multiple Access: Tutorial, Myths, and Frequently Asked Questions (2022, background): “The DD domain symbol multiplexing enables a direct coupling of the transmitted symbols with the channel’s delay-Doppler spread function, which has nice properties, such as quasi-static, compact, and sparse, to be exploited to achieve a low channel estimation overhead and full channel diversity with ”
A Tutorial on Environment-Aware Communications via Channel Knowledge Map for 6G (2023, background): “For example, to address the inter-carrier interference (ICI) issue suffered by OFDM in high mobility scenarios, orthogonal time frequency space (OTFS) modulation has been recently proposed to modulate information in the delay-Doppler domain [24].”