tion, that simultaneously utilizes physical resources in multiple dimensions such as time, frequency, and space to achieve the maximum diversity gains that are inherent to the wireless channels. As explained earlier, OTFS is a novel and fresh approach in waveform design that takes advantage of full channel diversity in multiple dimensions by deploying the delay-Doppler instead of the time-frequency plane to multiplex the transmit data where the time varia- tions of the channel are integrated over time. Hence, the equivalent channel relating the input and output of the system boils down to a sparse and time-invariant one. This is a very important result leading to longer coherence times for the wireless channel. Conse- quently, a much slower channel tracking and much lower reference-signal/training over- heads are required for OTFS compared with its OFDM counterpart with adaptive sub- carrier spacing/symbol duration. Additionally, OTFS can be implemented on the top of any given multicarrier waveform that utilizes the time-frequency grid for data transmis- sion, only with the addition of precoding and post-processing units to the modulator and demodulator, respectively. This makes OTFS attractive especially to industry, as it does not demand fundamental changes to the baseband processing units of the currently existing 3GPP LTE standard and 5G NR. Additionally, as it was shown in the Sections 6.5 and 6.6, OTFS transceiver can be efficiently implemented with significantly lower computa- tional complexity than the existing transceiver structures. Owing to all these benefits, OTFS has gained significant momentum in both industry and academia as a candidate wave- form to deal with TV wireless channel environments that appear in the future wireless networks. 6.7 Recent Results and Potential Research Directions OTFS was first proposed in the landmark paper [4], where a continuous-time for- mulation of a single-antenna system was presented. In [11-13], OTFS was studied and compared with OFDM in mmWave systems, 28 GHz band