A Non-Gaussianity-Aware Receiver for Impulsive Noise Mitigation in Underwater Communications

Impulsive noise significantly deteriorates the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. The pulse blanking (PB) based approach can mitigate the impulsive noise. However, it causes inter-carrier interference (ICI) and sign...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2021-06, Vol.70 (6), p.6018-6028
Main Authors: Li, Hua, Dong, Yuanyuan, Gong, Caihong, Zhang, Zhenyu, Wang, Xiyuan, Dai, Xiaoming
Format: Article
Language:English
Subjects:
Attenuation
AWGN
Blanking
Communications systems
Companding
Impulsive noise
inter-carrier interference (ICI)
Interference
Iterative decoding
Iterative methods
Likelihood ratio
Noise
OFDM
Orthogonal Frequency Division Multiplexing
Performance degradation
pulse blanking (PB)
Receivers
Signal to noise ratio
underwater acoustic (UWA)
Underwater acoustics
Underwater communication
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Summary:Impulsive noise significantly deteriorates the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. The pulse blanking (PB) based approach can mitigate the impulsive noise. However, it causes inter-carrier interference (ICI) and signal attenuation to the receiver. In this work, we first show that the ICI introduces pronounced non-Gaussianity to the receiver chain and leads to significant performance degradation. We then propose a non-Gaussianity-aware iterative ICI cancelation scheme to mitigate the adverse impacts of PB. A companding transformation scheme is incorporated into the soft symbol computation to alleviate the non-Gaussianity of the log-likelihood ratios (LLRs) caused by the residual ICI and impulsive noise. Simulation results illustrate that the proposed non-Gaussianity-aware iterative receiver achieves significant performance gains over the conventional non-Gaussianity-agnostic one with even lower computational complexity.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2021.3079469