Analysis of Adapted Tone Reservation PAPR Reduction Techniques in OTSM System

Orthogonal time sequency multiplexing (OTSM) is one of the novel modulation candidates which has been recently proposed for future 6G wireless communications, as it outper-forms the well-known orthogonal frequency division multiplexing (OFDM) and orthogonal time frequency space (OTFS) systems in terms of bit error rate (BER) and computational complexity, respectively in a high-mobility doubly dispersive wireless channel. However, a current analysis reveals that OTSM suffers from a very high peak-to-average power ratio (PAPR) problem like the conventional OFDM. As a result, this paper takes the initiative of analyzing the efficacy of the adapted versions of the classical tone reservation (TR) PAPR reduction technique in the sequency-delay domain of the new OTSM systems, in terms of PAPR reduction gains, computational complexity and BER performance as currently, none exists in the literature. This research reveals how the TR can be adapted with reserved-tone vectors (RVs) to the new delay-sequency domains and how its PAPR reduction capability and computation complexity vary with each new algorithmic change. The results provide analytical and simulation-wise insights into the newly-adapted TR (A- TR) algorithms in OTSM systems which will prove to be useful for carrying out future research in 6G.