2021/11/14 by Simon Tarboush, Hadi Sarieddeen, Tarboush, Simon +5 · 2 citations
Engineering · #Emerging Technologies (cs.ET) #FOS: Computer and information sciences #Information Theory (cs.IT) #Microwave Engineering and Waveguides #Millimeter-Wave Propagation and Modeling #Radio Frequency Integrated Circuit Design
paper · pdf · doi:10.48550/arxiv.2111.07398
openalex publication_date 2021/11/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The prospects of utilizing single-carrier (SC) and multi-carrier (MC)\nwaveforms in future terahertz (THz)-band communication systems remain\nunresolved. On the one hand, the limited multi-path components at high\nfrequencies result in frequency-flat channels that favor low-complexity\nwideband SC systems. On the other hand, frequency-dependent molecular\nabsorption and transceiver characteristics and the existence of multi-path\ncomponents in indoor sub-THz systems can still result in frequency-selective\nchannels, favoring off-the-shelf MC schemes such as orthogonal\nfrequency-division multiplexing (OFDM). Variations of SC/MC designs result in\ndifferent THz spectrum utilization, but spectral efficiency is not the primary\nconcern with substantial available bandwidths; baseband complexity, power\nefficiency, and hardware impairment constraints are predominant. This paper\npresents a comprehensive study of SC/MC modulations for THz communications,\nutilizing an accurate wideband THz channel model and highlighting the various\nperformance and complexity trade-offs of the candidate schemes. Simulations\ndemonstrate that discrete-Fourier-transform spread orthogonal time-frequency\nspace (DFT-s-OTFS) achieves a lower peak-to-average power ratio (PAPR) than\nOFDM and OTFS and enhances immunity to THz impairments and Doppler spreads, but\nat an increased complexity cost. Moreover, DFT-s-OFDM is a promising candidate\nthat increases robustness to THz impairments and phase noise (PHN) at a low\nPAPR and overall complexity.\n