We investigate the properties an exotic symbol class of pseudodifferential operators, Sjöstrand’s class, with methods of time-frequency analysis (phase space analysis). Compared to the classical treatment, the time-frequency approach leads to striklingly simple proofs of Sjöstrand’s fundamental results and to far-reaching generalizations.

In this article, we propose a space spreading-assisted framework that leverages either {time or frequency diversity both to reduce interference and signal loss} owing channel impairments facilitate the efficient operation of large-scale dense Internet-of-Things (IoT). Our approach employs dispersion data-streams transmitted from individual IoT devices over indexed space-time (ST), space-frequen...

The first two parts of this tutorial on orthogonal time frequency space (OTFS) modulation have discussed the fundamentals delay-Doppler (DD) domain communications as well some advanced technologies for transceiver design. In letter, we will present an OTFS-based integrated sensing and (ISAC) system, which is regarded enabling technology in next generation wireless communications. particular, il...