@article{MBB9D5BAF,
title = "Low PAPR Orthogonal Time Sequency Multiplexing with Selectively Scrambled Walsh-Hadamard Transforms",
journal = "The Journal of Korean Institute of Communications and Information Sciences",
year = "2025",
issn = "1226-4717",
doi = "10.7840/kics.2025.50.12.1884",
author = "Hyungseop Son, Kwonhue Choi",
keywords = "OTSM, OTFS, PAPR, 2-dimensional waveform",
abstract = "We propose a novel technique to generate low Peak-to-Average Power Ratio (PAPR) Orthogonal Time Sequency Multiplexing (OTSM) using a scrambled Walsh-Hadamard transform (S-WHT). While conventional modulation schemes like Orthogonal Time Frequency Space (OTFS) and OTSM are designed to improve performance in high-mobility and multipath channels, they suffer from high PAPR, reducing power amplifier efficiency. Although discrete Fourier transform-spread OTFS (DFT-s-OTFS) has been introduced to reduce PAPR, it compromises diversity and robustness in high-mobility scenarios. Our method addresses this trade-off by selectively applying an S-WHT matrix, reducing PAPR while retaining OTSM's resilience to multipath fading and Doppler effects. We demonstrate through simulations that our technique achieves lower PAPR compared to conventional OTFS, OTSM, and DFT-s-OTFS, while also achieving superior bit error rate (BER)."
}