TY  - JOUR
T1  - Data Sequence Mapping and Substitution for PAPR Reduction in OTFS
AU  - Park, Sangwook 
AU  - Lee, Hyeongwon 
AU  - Ryu, Kwanwoong 
AU  - Choi, Kwonhue 
JO  - The Journal of Korean Institute of Communications and Information Sciences
PY  - 2025
DA  - 2025/1/1
DO  - 10.7840/kics.2025.50.10.1545
KW  - OTFS
KW  - PAPR
KW  - IDFT
KW  - Delay-Doppler
AB  - Multicarrier systems, such as Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Time Frequency Space (OTFS), suffer from high Peak-to-Average Power Ratio (PAPR), which degrades the efficiency of high-power amplifiers. To address the PAPR issue in OTFS, Discrete Fourier Transform spread OTFS (DFT- s-OTFS) has been proposed, which reduces PAPR through DFT precoding. However, this process leads to bit error rate (BER) performance degradation in high-speed mobile environments due to diversity loss.
In this paper, we propose a PAPR reduction scheme that effectively lowers the PAPR while preserving the diversity of OTFS by substituting high-PAPR data sequences with low-PAPR ones. To this end, the Hungarian algorithm is employed to establish optimal mapping relationships between data sequences, which are then used for substitution. Simulation results demonstrate that the proposed scheme achieves lower PAPR and improved BER performance compared to conventional OTFS and DFT-s-OTFS.