A Practical Pilot for Channel Estimation of OTFS
Citation:
Sanoopkumar, P.S., Farhang, A., A Practical Pilot for Channel Estimation of OTFS, IEEE International Conference on Communications, Rome, Italy, 28 May - 01 June, 2023Download Item:
Abstract:
The widely used embedded impulse pilot for channel estimation of orthogonal time frequency space modulation
(OTFS) has a prohibitively large peak to average power ratio
(PAPR). Hence, in this paper, we propose a novel embedded
pilot with cyclic prefix (PCP) that has a significantly reduced
PAPR compared to the impulse pilot. This is achieved by
spreading the pilot power along the delay dimension using a
constant amplitude Zadoff-Chu (ZC) sequence with a cyclic prefix
(CP). We analytically derive upper bound PAPR expressions
for the impulse pilot and the proposed PCP. Together with our
numerical results, these upper bounds attest the significant PAPR
improvement that is achieved by PCP. We also develop a two-
stage channel estimation technique with a superior performance
to the threshold-based channel estimation for the impulse pilot.
At the first stage, the channel is estimated by a linear estimator
under the assumption of the channel being locally linear time
invariant over each time-slot within the OTFS block. Taking
advantage of the benefits that are offered by the CP in our
proposed pilot structure, we develop a low complexity least
squares based estimator for implementation of the first stage.
At the second stage, we use the channel estimate from the first
stage and the generalized complex exponential basis expansion
model (GCE-BEM) to accurately estimate the full channel.
Finally, we numerically analyse and show the superior estimation
performance of our proposed channel estimator for PCP to the
threshold-based estimator for the impulse pilot.
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 availableSubject (TCD):
Telecommunications , DIGITAL SIGNAL PROCESSING , ELECTRONICS , Signal processingDOI:
http://dx.doi.org/10.36227/techrxiv.21594162Metadata
Show full item recordLicences: