2021 - 1ST WORKSHOP ON ORTHOGONAL TIME FREQUENCY SPACE MODULATION (OTFS) FOR 6G AND FUTURE HIGH-MOBILITY COMMUNICATIONS

Future wireless networks are expected to provide high speed and ultra-reliable communications for a wide range of emerging mobile applications, including online gaming, vehicle-to-everything (V2X), and high-speed railway systems. Communications in high mobility scenarios suffer from severe channel Doppler spreads, which deteriorate the performance of the widely adopted orthogonal frequency division multiplexing (OFDM) modulation in the current fourth-generation (4G) and emerging fifth-generation (5G) networks. On the other hand, the spectrum congestion under 6 GHz frequency bands and data hungry applications make communications over high frequency bands desirable, such as millimeter wave (mmWave) bands ranging from 30 GHz to 300 GHz with much wider available bandwidth.
Recently, a new two-dimensional (2D) modulation scheme referred to as orthogonal time frequency space (OTFS) was proposed, where the information symbols are multiplexed in the Delay-Doppler (DD) domain rather than the time-frequency (TF) domain as the traditional modulation techniques. The DD domain multiplexing provides the possibility to embrace the channel impairments, such as delay and Doppler shifts, and to provide the benefits of delay- and Doppler-resilience. More importantly, OTFS enjoys the full time-frequency diversity of the channel, which is the key to provide reliable communications. In addition, OTFS modulation effectively transforms a time-variant channel into an effective 2D time-invariant channel in the DD domain, where attractive properties, such as separability, compactness, stability, and possibly sparsity, exhibit and are potential to be exploited for OTFS system designs.
As existing wireless communication design principles and technologies were mainly for low-mobility channel characteristics at a low carrier frequency, OTFS introduces new critical challenges for transceiver architecture and algorithm designs. To fully unleash the potential of OTFS, challenging fundamental research problems and many practical design issues must be addressed, including channel estimation, detection techniques, and multiple antenna and multiple user systems design. This workshop aims at bringing together academic and industrial researchers in an effort to identify and discuss the major technical challenges, recent breakthroughs, and new applications related to OTFS. Topics of interest include but are not limited to:
Channel measurement and modeling in the DD domain
Fundamental information theoretical limits for OTFS
Capacity scaling of OTFS for multiple antenna and multiuser systems
Signal processing for OTFS transceiver designs
Channel estimation for OTFS
Receiver design for OTFS
Machine learning/AI enhanced OTFS
MIMO and massive MIMO design for OTFS
Multiple access schemes for OTFS
Network architectures and transmission protocols for OTFS
System-level simulation, prototyping, and field-tests for OTFS
Standardization of OTFS
Joint radar and communication via OTFS
DD domain and TF domain filter designs for OTFS
Transmit and receive window designs for OTFS
Coded OTFS system performance analysis
Coexisting of 5G and OTFS signaling
FDD and TDD OTFS systems
OTFS for URLLC
Security and privacy issues in OTFS
The application of OTFS in mmWave and Tera Hertz