Two Dimensional Adaptive Multichannel Decision Feedback Equalization for OTFS System

Orthogonal time-frequency-space (OTFS) modulation has shown significant error performance advantages over orthogonal frequency division multiplexing (OFDM) in time-varying channels. However, the symbols in OTFS frames still suffer from inter-Doppler interference (IDI) and inter-symbol interference (...

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Bibliographic Details
Published in:IEEE communications letters 2021-03, Vol.25 (3), p.840-844
Main Authors: Jing, Lianyou, Wang, Han, He, Chengbing, Zhang, Yang, Yin, Hongxi
Format: Article
Language:English
Subjects:
adaptive multichannel decision feedback equalization
Adaptive systems
Channel estimation
Channels
Complexity theory
Decision feedback equalizers
Delays
Equalization
Feedback
Interference
IPNLMS
Least mean squares
Least mean squares algorithm
Modulation
Orthogonal Frequency Division Multiplexing
OTFS
Receivers
two dimensional
Two dimensional displays
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Summary:Orthogonal time-frequency-space (OTFS) modulation has shown significant error performance advantages over orthogonal frequency division multiplexing (OFDM) in time-varying channels. However, the symbols in OTFS frames still suffer from inter-Doppler interference (IDI) and inter-symbol interference (ISI). In this letter, we propose a two dimensional (2D) adaptive multichannel decision feedback equalizer (DFE) to combat the interference. The proposed receiver constructs the input signal and feedback signal of the DFE based on the characteristic of OTFS modulation. Meanwhile, by exploiting the sparsity feature of the channels in delay-Doppler domain, the iterative improved proportionate normalized least mean squares (IPNLMS) algorithm is employed to achieve fast convergence and fast tracking. The simulation results show that the proposed equalizer could achieve satisfied BER performance with lower complexity.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2020.3039982