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

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