Data-Driven OTFS Channel Estimation Based on Gated Recurrent Convolutional Autoencoder

Considering the traffic environment with highmoving vehicles, orthogonal time frequency space (OTFS) has become an emerging technology to handle the rapid timevarying channels via vehicular communications. Due to sparse representation of the delay-Doppler (DD) domain, the related channel information...

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Published in:International Symposium on Communications and Information Technologies (Online) pp. 7 - 12
Main Authors: Chen, Junshen, Yuan, Qihao, Zhang, Shiyao, Liu, Chang
Format: Conference Proceeding
Language:English
Published: IEEE 16.10.2023
Subjects:
Channel estimation
Convolution
gated recurrent convolutional autoencoder
Noise reduction
orthogonal time frequency space
Simulation
System performance
Time-frequency analysis
Uncertainty
ISSN:2643-6175
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Abstract Considering the traffic environment with highmoving vehicles, orthogonal time frequency space (OTFS) has become an emerging technology to handle the rapid timevarying channels via vehicular communications. Due to sparse representation of the delay-Doppler (DD) domain, the related channel information can be estimated by means of the embedded pilot technique. However, the uncertainties of unknown and burst noise can incur system performance degradation issues. To tackle this problem, in this paper, we propose a novel gated recurrent convolutional autoencoder (GRCAE) model to denoise the complex noise for channel estimation in OTFS systems. Specifically, the proposed model can distinguish and retain the significant features of the signal during the denoising process through the gated recurrent unit (GRU) network. Meanwhile, the convolutional autoencoder can better capture the local spatial features of the signal and reconstruct them to obtain a denoised signal. The parallel procedure further improves the denoising accuracy and robustness. Our simulation results demonstrate that the proposed GRCAEbased approach present satisfactory performance in various noise scenarios.
AbstractList Considering the traffic environment with highmoving vehicles, orthogonal time frequency space (OTFS) has become an emerging technology to handle the rapid timevarying channels via vehicular communications. Due to sparse representation of the delay-Doppler (DD) domain, the related channel information can be estimated by means of the embedded pilot technique. However, the uncertainties of unknown and burst noise can incur system performance degradation issues. To tackle this problem, in this paper, we propose a novel gated recurrent convolutional autoencoder (GRCAE) model to denoise the complex noise for channel estimation in OTFS systems. Specifically, the proposed model can distinguish and retain the significant features of the signal during the denoising process through the gated recurrent unit (GRU) network. Meanwhile, the convolutional autoencoder can better capture the local spatial features of the signal and reconstruct them to obtain a denoised signal. The parallel procedure further improves the denoising accuracy and robustness. Our simulation results demonstrate that the proposed GRCAEbased approach present satisfactory performance in various noise scenarios.
Author Chen, Junshen
Zhang, Shiyao
Yuan, Qihao
Liu, Chang
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  givenname: Junshen
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  givenname: Qihao
  surname: Yuan
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  givenname: Shiyao
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  organization: Southern University of Science and Technology,Shenzhen,China
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  givenname: Chang
  surname: Liu
  fullname: Liu, Chang
  email: changwcom.liu@polyu.edu.hk
  organization: The Hong Kong Polytechnic University,Hong Kong SAR,China
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Snippet Considering the traffic environment with highmoving vehicles, orthogonal time frequency space (OTFS) has become an emerging technology to handle the rapid...
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StartPage 7
SubjectTerms Channel estimation
Convolution
gated recurrent convolutional autoencoder
Noise reduction
orthogonal time frequency space
Simulation
System performance
Time-frequency analysis
Uncertainty
Title Data-Driven OTFS Channel Estimation Based on Gated Recurrent Convolutional Autoencoder
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