A Simple Two-Stage Equalizer for OTFS With Rectangular Windows

Orthogonal time-frequency space (OTFS) bears the potential to achieve excellent performance in high mobility scenarios. However, conventional linear equalizer performs poorly. In this letter, we propose a novel two-stage equalizer, wherein received signals are judiciously processed in two domains. F...

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Bibliographic Details
Published in:IEEE communications letters 2021-04, Vol.25 (4), p.1158-1162
Main Authors: Jin, Chenxi, Bie, Zhisong, Lin, Xuehong, Xu, Wenjun, Gao, Hui
Format: Article
Language:English
Subjects:
Channel estimation
Complexity theory
delay-Doppler channel
Doppler effect
Equalizers
Interference
OTFS
Signal processing
Sparse matrices
Time-frequency analysis
two-stage equalizer
Windows (intervals)
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Summary:Orthogonal time-frequency space (OTFS) bears the potential to achieve excellent performance in high mobility scenarios. However, conventional linear equalizer performs poorly. In this letter, we propose a novel two-stage equalizer, wherein received signals are judiciously processed in two domains. First, in the time-frequency domain, a sliding window-assisted minimum mean square error (SW-MMSE) equalizer is proposed to restrict the inter-carrier interference effectively. Then in the second stage, a delay-doppler domain equalizer further mitigates the residual inter-symbol interference of the first stage. Our proposed two-stage equalizer enjoys low implementation complexity, and simulation validates its performance advantage over the conventional one-stage MMSE equalizer.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2020.3043841