Shuangyang Li

Shuangyang Li

Ph.D., University of New South Wales (UNSW)

Talks and presentations

Delay-Doppler Domain Communications and Sensing

June 01, 2023

Presentation (together with Prof. Weijie Yuan and Prof. Zhiqiang Wei), IEEE International Communications Conference (ICC), Rome, Italy

Future wireless networks are envisioned to support ubiquitous connectivity to a wide range of emerging applications operating in hostile environments, spanning from autonomous cars to unmanned aerial/underwater vehicles (UAV/UUV), and low-earth-orbit (LEO) satellites, etc. This requires novel wireless technology to provide highly reliable data transmission and highly accurate sensing simultaneously. However, the strong multipath, high delay and Doppler features in those hostile environments can impose great challenges for reliable wireless communications and accurate sensing. Consequently, the conventional orthogonal frequency division multiplexing (OFDM) modulation may fail due to the high dynamical channel fluctuations and complex sensing scenario. The recently proposed orthogonal time frequency space (OTFS) modulation has provided a fundamentally different perspective of waveform design in the delay-Doppler (DD) domain in contrast to the conventional time-frequency (TF) domain designs. The DD domain communications and sensing have shown promising performance over various channels thanks to the intrinsic connections between the two functionalities in the DD domain and its advantages have been widely evident from both academic and industry perspectives. This tutorial aims to provide a comprehensive understanding of the DD domain communications and sensing with specific focuses on its fundamentals, advanced designs, performance analysis, and applications.

Orthogonal Time Frequency Space Modulation: Waveform for Future Wireless Networks

June 19, 2022

Presentation (together with Prof. Weijie Yuan and Prof. Zhiqiang Wei), IEEE Vehicular Technology Conference (VTC) Spring 2022, Helsinki, Finland (virtual)

Future wireless networks are expected to support ubiquitous connectivity to a wide range of emerging applications operating in hostile environments, spanning from autonomous cars to low-earth-orbit satellites, and underwater acoustic communications. The strong multipath, high delay and Doppler features in those hostile environments can impose great challenges for reliable wireless communications. Consequently, the conventional OFDM modulation may fail due to the high dynamical channel fluctuations. Recently proposed orthogonal time frequency space (OTFS) modulation has provided a different perspective of waveform design in contrast to the time-frequency signal processing paradigm. OTFS has shown promising performance over various channels and its advantages has been widely evident from both academic and industry perspectives. This tutorial aims to provide the state-of-art of OTFS with specific focuses on its fundamentals, advanced designs, performance analysis, and applications.

Delay-Doppler Domain Signal Processing for Communication: Why It is Good?

December 14, 2021

Presentation, Southern University of Science and Technology, Shenzhen, China

The recently proposed orthogonal time frequency space (OTFS) modulation has provided a new perspective for communication designs for future wireless systems. In contrast to conventional multi-carrier modulation schemes, OTFS modulation innovatively multiplexes the information data in the delay-Doppler (DD) domain rather than the well-known time-frequency (TF) domain. Thus, it provides many appealing advantages for communication designs, such as potential full-diversity and low-complexity transmitter/receiver implementation. In this talk, we will present the recent advances of DD domain signal processing for communications and discuss the reasons why it is good. In specific, this talk will cover several developments of OTFS modulation from different perspectives, including the achievable rate analysis, channel coding, cross domain detection, multi-user MIMO design, and integrated sensing and communications (ISAC), where important insights on DD domain communication designs will also be highlighted.

Recent Advances on OTFS Modulation: Performance Analysis and Signal Detection

June 04, 2021

Presentation, Xidian University, Xi'an, China

Orthogonal time frequency space (OTFS) modulation has attracted substantial attention recently. It has demonstrated superior performance compared to the conventional orthogonal frequency-division multiplexing (OFDM) modulation in the high-Doppler scenarios. Therefore, it has been widely acknowledged as a potential key enabler for emerging applications, such as unmanned aerial vehicles (UAVs) and low-earth-orbit (LEO) satellites. In this presentation, we will summarize some recent advances on OTFS modulation, with a specific focus on its performance analysis with channel coding and signal detection. In particular, we will unveil the trade-off between the coding gain and diversity gain for OTFS modulation. We will also discuss how the unitary transformations between different domains, such as the time-delay domain and the delay-Doppler domain, can help the signal detection.