DFT-Spread Orthogonal Time Frequency Space Modulation Design for Terahertz Communications
Yongzhi Wu, Chong Han, Tao Yang
Abstract
Terahertz (THz) band communication is a promising pillar technology to satisfy the demands of intelligent information society. The ultra-broad bandwidth in the THz band provides a great potential of a plethora of applications and services. However, THz wireless communication systems encounter stringent challenges, including more severe Doppler effects and more strict peak-to-average power ratio (PAPR) requirements. In this work, a discrete Fourier transform spread orthogonal time frequency space (DFT-s-OTFS) modulation scheme is proposed to address these issues of THz communications. The proposed DFT-s-OTFS can improve the bit error rate (BER) performance by two orders of magnitude compared to orthogonal frequency division multiplexing (OFDM) in presence of high Doppler spread, and reduce the PAPR by approximately 3 dB in contrast with OTFS.