Improved Initial Time Synchronization for OTFS
Journal
IEEE Vehicular Technology Conference
Start Page
1
End Page
7
ISBN (of the container)
979-833150320-8
Date Issued
2026-01-06
Author(s)
Abstract
Initial time synchronization (ITS) is essential for the coherent demodulation in orthogonal time frequency space systems operating over the linear time-varying multipath (LTV) channels. Previous studies have developed efficacious preamble-frame-based ITS approaches using various select-the-largest identification rules to estimate the leading channel path delay over LTV channels exhibiting a strong leading path. However, such ITS approaches provide noticeable estimation inaccuracy under LTV channels without a strong leading path. In this paper, a comb-type preamble-frame (CPF)-based ITS system adopting discrete-time oversampling and a new select-the-leading-peak identification rule is proposed to provide improved ITS performance. Particularly, whether LTV channels exhibit a strong leading path or not, the improved CPF-based ITS system outperforms existing preamble-frame-based ITS systems significantly in estimation accuracy and robustness against Doppler spread.
Event(s)
2025 IEEE 102nd Vehicular Technology Conference, VTC 2025
Subjects
comb-type preamble frame waveform
initial time synchronization
linear time-varying multipath channel
Orthogonal time frequency space
Publisher
IEEE
Type
conference paper