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 inIEEE communications letters Vol. 25; no. 4; pp. 1158 - 1162
Main Authors Jin, Chenxi, Bie, Zhisong, Lin, Xuehong, Xu, Wenjun, Gao, Hui
Format Journal Article
LanguageEnglish
Published New York IEEE 01.04.2021
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
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