Orthogonal Time Frequency Space Modulation-Part III: ISAC and Potential Applications

The first two parts of this tutorial on orthogonal time frequency space (OTFS) modulation have discussed the fundamentals of delay-Doppler (DD) domain communications as well as some advanced technologies for transceiver design. In this letter, we will present an OTFS-based integrated sensing and communications (ISAC) system, which is regarded as an enabling technology in next generation wireless communications. In particular, we illustrate the sensing as well as the communication models for OTFS-ISAC systems. Next, we show that benefiting from time-invariant DD channels, the sensing parameters can be used for inferring the communication channels, leading to an efficient transmission scheme. As both functionalities are realized in the same DD domain, we briefly discuss several promising benefits of OTFS-based ISAC systems, which have not been completely unveiled yet. Finally, a range of potential applications of OTFS for the future wireless networks will be highlighted.

Automated summary

The first two parts of this tutorial on orthogonal time frequency space (OTFS) modulation have discussed the fundamentals of delay-Doppler (DD) domain communications as well as some advanced technologies for transceiver design. In this letter, we present an OTFS-based integrated sensing and communications (ISAC) system, which is an enabling technology in next generation wireless communications. We describe the sensing and communication models for OTFS-ISAC systems, and show that the sensing parameters can be used to infer the communication channels in time-invariant DD channels, leading to an efficient transmission scheme. We also discuss the promising benefits of OTFS-based ISAC systems and highlight potential applications of OTFS for future wireless networks.