Optimization of Turbo Decoding Performance in the Presence of Impulsive Noise Using Soft Limitation at the Receiver Side

Ndo, Gaetan; Siohan, Pierre; Hamon, Marie-Hélène; Horard, J.

doi:10.1109/glocom.2008.ecp.559

Cited by 22 publications

(24 citation statements)

References 9 publications

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“…Inspired by that feasibility, we hereby address the impulsive noise characterized with excessive energy and moderately high probability of occurrence in OFDM system by means of a limiter whose clipping threshold is derived in a frequency-domain perspective based only on the probability of occurrence of impulses. Simulations conducted in compliance with IEEE 1901 reveal that the BER results derived from our clipping threshold are very close to those induced by optimal threshold [8].…”

Section: Introductionsupporting

confidence: 69%

“…Recall that in the context where the OFDM technique can not realize impulsive noise reduction but, by contrast, exacerbates performance degradation, an effective limiter is suggested to be employed [8], [6] with the clipping nonlinearity described below:…”

Section: B Design Of Clipping Thresholdmentioning

confidence: 99%

“…Nevertheless, as was revealed in [4], [6], OFDM system is even outperformed by its single-carrier counterpart in terms of uncoded symbol error probability in the context of excessive impulsive noise energy coupled with moderately high probability of occurrence of impulses. Further, as opposed to its single-carrier counterpart [7], the perfect statistical knowledge of impulsive noise at decoder cannot assure the realization of coding gain in OFDM system under this circumstance [8].…”

Section: Introductionmentioning

confidence: 98%

“…To overcome this devastating impairment mentioned above, a limiter placed in front of the FFT operator is shown to be an effective tool with no intensive complexity involved [6], [8], [9], [10]. Rather than experimentally derived in [9], [10], the clipping threshold for limiter can be devised by taking into account the knowledge of the probability density function (PDF) of the impulsive noise at receiver based on either detection theory [8] or some metric approximation for limiter's nonlinearity behavior [6].…”

Section: Introductionmentioning

confidence: 99%

“…Rather than experimentally derived in [9], [10], the clipping threshold for limiter can be devised by taking into account the knowledge of the probability density function (PDF) of the impulsive noise at receiver based on either detection theory [8] or some metric approximation for limiter's nonlinearity behavior [6]. However, as shown in [11], power line noise behaves signiſcantly different from the conventional white Gaussian noise that is commonly assumed in wireless communication research.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Efficient clipping for broadband power line systems in impulsive noise environment

Tseng

Yang

Tsai

et al. 2012

2012 IEEE International Symposium on Power Line Communications and Its Applications

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For broadband power line communication systems, which may be incorporated with Orthogonal Frequency Division Multiplexing (OFDM) technique, the detrimental effect arising from strong and frequently occurred impulses is paramount as signaling on each subcarrier is simultaneously corrupted thanks to frequencydomain transformation on a per-OFDM symbol basis at the front-end receiver. In this perspective, channel coding epoch on the basis of per-OFDM symbol cannot effect the coding gain. Recently, clipping operation on received samples has been addressed as an effective approach to mitigate this incurring performance loss subject to impulsive noise, given the knowledge of the probability density function (PDF) of impulsive noise at receiver. In this paper, we forgo the a-priori knowledge of the PDF of impulsive noise but devise the threshold to clipping, only relying on the probability of occurrence of impulses. To attest our method, we conduct computer simulations in compliance with the IEEE 1901 standard over commonly adopted memoryless impulsive noise models. Promisingly, the proposed scheme is on par with its counterpart, where the threshold of a limiter is realized by assuming the PDF of impulsive channels perfectly known to receiver. In addition, the devised clipping scheme is shown to be robust against impulses of frequent occurrence characterized by excessively high energy in the signal-to-noise ratio range of interest, regardless of the impulsive noise model assumed.

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Section: Introductionsupporting

confidence: 69%

Section: B Design Of Clipping Thresholdmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Efficient clipping for broadband power line systems in impulsive noise environment

Tseng

Yang

Tsai

et al. 2012

2012 IEEE International Symposium on Power Line Communications and Its Applications

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Parameter estimation of impulsive noise for channel coded communication systems

Chen

Chiu

2020

IET Communications

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In this paper, an impulsive noise estimation algorithm for generating bit log‐likelihood ratios (LLRs) for channel coded systems in impulsive noise environments is proposed. This approach is to design the LLR detector in the maximum‐likelihood (ML) sense, which requires the parameters of the impulsive noise. The expectation‐maximisation (EM) algorithm is utilised to estimate the parameters of the Bernoulli–Gaussian (B–G) impulsive noise model. The estimated parameters is then used to generate the bit LLRs for the soft‐input channel decoder. Simulation results show that over a wide range of impulsive noise power, the proposed algorithm approaches the optimal performance (with ideal estimation) even under Middleton class‐A (M‐CA) impulsive noise models.

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Intermittently Nonlinear Impulsive Noise Mitigation and Doppler Shift Compensation in UWA-OFDM Systems

Barazideh

Niknam²,

Natarajan

et al. 2019

IEEE Access

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Impulsive noise (IN) and Doppler shift can significantly degrade the performance of orthogonal frequency-division multiplexing (OFDM)-based underwater acoustic (UWA) communication systems. In this paper, we propose a receiver structure that deals efficiently with both these channel impairments in a coded OFDM-based UWA system. First, an analog nonlinear preprocessor (ANP) is proposed to efficiently detect and mitigate IN in an analog domain. The proposed ANP exhibits intermittent nonlinearity when there is impulsivity. Next, the impact of IN on a two-step Doppler shift compensation approach is quantified. Specifically, the ability of the ANP to improve the robustness of Doppler shift compensation in the presence of IN is highlighted. The performance improvement of the proposed receiver is due to the fact that unlike the other nonlinear methods, the ANP is implemented in the analog domain where the outliers are still broadband and distinguishable. The simulation results also demonstrate the superior bit-error-rate (BER) performance of our approach relative to classic approaches that use blanking and/or clipping for IN mitigation. INDEX TERMS Impulsive noise (IN), analog nonlinear preprocessor (ANP), orthogonal frequency-division multiplexing (OFDM), Doppler shift, underwater acoustic (UWA).

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Optimization of Turbo Decoding Performance in the Presence of Impulsive Noise Using Soft Limitation at the Receiver Side

Cited by 22 publications

References 9 publications

Efficient clipping for broadband power line systems in impulsive noise environment

Efficient clipping for broadband power line systems in impulsive noise environment

Parameter estimation of impulsive noise for channel coded communication systems

Intermittently Nonlinear Impulsive Noise Mitigation and Doppler Shift Compensation in UWA-OFDM Systems

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