Time and Frequency Synchronization for Multiuser OTFS in Uplink
Mohsen Bayat, Sanoopkumar P.S., and Arman Farhang

TL;DR
This paper introduces novel time and frequency synchronization techniques for uplink multiuser OTFS systems in high-mobility scenarios, improving accuracy and efficiency in estimating timing and carrier frequency offsets.
Contribution
It proposes new pilot structures and correlation-based methods for TO estimation, and a reduced-complexity CFO estimation technique using CPF-BEM for multiuser OTFS uplink.
Findings
Enhanced TO estimation accuracy with correlation-based techniques.
Reduced complexity in CFO estimation via CPF-BEM.
Effective separation of multiuser signals in high-mobility environments.
Abstract
In this paper, we propose time and frequency synchronization techniques for uplink multiuser OTFS (MU-OTFS) systems in high-mobility scenarios. This work focuses on accurately estimating and correcting timing offsets (TOs) and carrier frequency offsets (CFOs). Specifically, TO estimation is essential for locating users' pilots on the delay-time plane, while CFO estimation enhances channel estimation accuracy. First, we propose a TO estimation technique for an existing multiuser pilot structure in MU-OTFS. We replace the impulse pilot (IMP) in this pilot structure with a more practical pilot with a cyclic prefix (PCP), referred to as single-user-inspired PCP (SU-PCP). This structure employs different Zadoff-Chu (ZC) sequences, which enables pilot separation via correlation at the receiver side. Consequently, we introduce a correlation-based TO estimation technique for uplink MU-OTFS…
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Taxonomy
TopicsPAPR reduction in OFDM · Network Time Synchronization Technologies · Power Line Communications and Noise
