users benefit from this multiple access scheme. This is due to the fact that NOMA enables the users with high mobility to spread their transmit data symbols in time-frequency plane while the static users directly deploy time-frequency grid for data transmission. Hence, low mobility or static users can simultaneously access the time-frequency resources that would be exclusive to the high mobility users in OMA sys- tems. This brings improvements in terms of spectral efficiency and latency [31]. Similar to any other multicarrier waveform, OTFS also suffers from large peak-to-average power ratio (PAPR). Thus, the authors in [33] study PAPR performance of OTFS and show its superiority to OFDM and GFDM. In [34], a two-dimensional impulse as an isolated pilot was considered for channel estimation similar to the one that was proposed in [22]. In this work, a trade-off between the power allocated to data symbols and the pilot symbol was reported. The authors also investigated the effect of pilot power on PAPR of the transmit- ted OTFS signal. Moreover, influence of power amplifier (PA) nonlinearity on OTFS was studied and it was observed that PA nonlinearities limit the BER performance of OTFS. OTFS is also analyzed in other communication media than the radio frequency bands, e.g. underwater acoustic channels [35] and optical-wireless communication channels [36]. In References [35], performance of OTFS in underwater acoustic channels in a multiuser massive MIMO setup is analyzed and compared against OFDM. In this study, it is shown that OTFS outper- forms the conventional OFDM systems in terms of BER performance. Inspired by OTFS, the authors in [36] design a 2D modulation scheme with Hermitian symmetry that is similar to OTFS and outperforms OFDM in terms of BER performance. Even though a reasonably large body of literature is formed around the topic of OTFS since its emergence, there is still space for pursuing new lines of research on this topic. Therefore, we close this chapter by itemizing a number of different resea