Reflections on OTFS and delay-Doppler Communications and Sensing

Orthogonal time frequency space (OTFS) modulation was presented by Hadani et al. in 2017. Since then, its significant advantages over OFDM in doubly dispersive channels for high-mobility wireless communications have been well documented in the literature. The key idea of OTFS is to model mobile wireless channels in the delay Doppler domain, where the sparse geometry of the reflectors in the channel is captured. This talk will introduce the general notion of delay-Doppler communications and sensing, starting from the fundamentals of high-mobility wireless channels, followed by the transceiver architecture for channel estimation, and finally discuss some implementation complexity trade-offs and future applications.