Practical Synchronization for OTFS
Citation:
Bayat, M., Sanoopkumar, P. S., Farhang, A., Practical Synchronization for OTFS, IEEE International Conference on Communications, Rome, Italy, 28 May - 01 June 202, 2023Download Item:
Abstract:
In the existing literature on joint timing and frequency synchronization of orthogonal time frequency space
modulation (OTFS), practically infeasible impulse pilot with
large peak-to-average power ratio (PAPR) is deployed. Hence,
in this paper, we propose a timing offset (TO) and carrier
frequency offset (CFO) estimation for OTFS over a linear time-
varying (LTV) channel, using a low PAPR pilot structure. The
proposed technique utilizes the recently proposed practically
feasible pilot structure with a cyclic prefix (PCP). We exploit
the periodic properties of PCP in both delay and time domains
to find the starting point of each OTFS block. Furthermore,
we propose a two-stage CFO estimation technique with over
an order of magnitude higher estimation accuracy than the
existing estimator using the impulse pilot. In the first stage,
a coarse CFO estimate is obtained which is refined in the
second stage, through our proposed maximum likelihood (ML)
based approach. The proposed ML-based approach deploys the
generalized complex exponential basis expansion model (GCE-
BEM) to capture the time variations of the channel, absorb
them into the pilot and provide an accurate CFO estimate.
Since our proposed synchronization technique utilizes the same
pilot deployed for channel estimation, it does not require any
additional overhead. Finally, we evaluate the performance of our
proposed synchronization technique through simulations. We also
compare and show the superior performance of our proposed
technique to the only other existing joint TO and CFO estimation
method in OTFS literature.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
19/FFP/7005(T)
Author's Homepage:
http://people.tcd.ie/afarhangDescription:
PUBLISHEDRome, Italy
Author: Farhang, Arman
Other Titles:
IEEE International Conference on CommunicationsType of material:
Conference PaperAvailability:
Full text availableKeywords:
OTFS, Timing offset estimation, Carrier frequency offset estimation, Maximum likelihood estimationSubject (TCD):
Telecommunications , DIGITAL SIGNAL PROCESSING , ELECTRONICS , Signal processingDOI:
http://dx.doi.org/10.48550/arXiv.2301.10080Metadata
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