Orthogonal Time-Frequency Space Modulation: A Promising Next-Generation Waveform

Sixth-generation (6G) wireless networks are envisioned to provide global coverage for the intelligent digital society of near future, ranging from traditional terrestrial non-terrestri-al networks, where reliable communications in high-mobility scenarios at high carrier frequencies would play a vital role. In such scenarios, conventional orthogonal frequency division multiplexing (OFDM) modulation, that has been widely used both fourth-generation (4G) and emerging fifth-generation (5G) cellular systems as well WiFi is vulnerable severe Doppler spread. this context, article aims introduce recently proposed two-dimension-al modulation scheme referred time-frequency space (OTFS) which conveniently accommodates channel dynamics via modulating information delay-Doppler domain. This provides an easy-reading overview OTFS, highlighting its underlying motivation specific features. The critical challenges OTFS our preliminary results presented. We also discuss range promising research opportunities potential applications 6G networks.