V. Mannoni

Université de Reims Champagne-Ardenne, Rheims, Champagne-Ardenne, France

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Publications (5)1.22 Total impact

  • V. Mannoni, G. Gelle, D. Declercq
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    ABSTRACT: This paper deals with optimized channel coding for OFDM transmissions (COFDM) over frequency selective channels using irregular low-density parity-check codes. Firstly, we introduce a new characterization of the LDPC code irregularity called "irregularity profile". Then, using this parameterization, we optimize the LDPC codes using the criterion based on the minimization of the convergence threshold. The optimization of this criterion is done using the Gaussian approximation technique. Simulations illustrate the good performance of our approach for different transmission channels.
    Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st; 01/2005
  • Valérian MANNONI, Guillaume GELLE
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    ABSTRACT: Nous présentons dans cet article une nouvelle méthode d'optimisation des codes correcteurs d'erreurs pour les transmissions OFDM codées sur canal sélectif en fréquence, basée sur l'utilisation des codes LDPC irréguliers. Dans un premier temps, nous introduisons une nouvelle paramétrisation des codes LDPC irréguliers que nous appelons profil d'irrégularité. Ensuite, nous proposons d'utiliser cette paramétrisation pour optimiser les codes LDPC pour les communications OFDM en utilisant comme critère la minimisation du seuil de convergence du code. L'optimisation de ce nouveau critère est ensuite faite par approximation Gaussienne. Des simulations illustrent les performances de notre approche comparativement à celle d'un code optimisé pour canal BABG.
    20° Colloque sur le traitement du signal et des images, 2005 ; p. 341-344. 01/2005;
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    ABSTRACT: A model is proposed to evaluate both the optimum temperature (leading to the maximum degradation of the device) and the degradation induced by high-temperature irradiation at a given dose rate on n-p-n bipolar-junction transistors. Using a genetic algorithm, the model parameters are extracted by fitting experimental curves. The model and experimental results, presented for two different devices, are in good agreement. The fitting procedure is discussed.
    IEEE Transactions on Nuclear Science 01/2003; · 1.22 Impact Factor
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    V. Mannoni, D. Declereq, G. Gelle
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    ABSTRACT: We present an optimized channel coding scheme for OFDM transmitter. Traditional coding methods use regular codes, in the sense that each bit participates in the same way to the channel encoding. Our approach consists in using a priory assumption on the channel available at the transmitter in order to optimize the coding scheme. We have considered the irregular Gallager block codes in our study. Simulations provide evidence of the usefulness of our approach with a gain of 2 dB at a bit error rate equal to 10<sup>-5</sup> for optimized irregular coding scheme compared to regular one.
    Personal, Indoor and Mobile Radio Communications, 2002. The 13th IEEE International Symposium on; 10/2002
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    V. Mannoni, D. Declercq
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    ABSTRACT: We present an optimized channel coding scheme for OFDM transmitter. Traditional coding methods use regular codes, in the sense that each bit participates in the same way to the channel encoding. Our approach consists in using a priory assumption on the channel available at the transmitter in order to optimize the coding scheme. We have considered the irregular Gallager block codes in our study. Simulations provide evidence of the usefulness of our approach with a gain of 2 dB at a bit error rate equal to ## for optimized irregular coding scheme compared to regular one.
    09/2002;