Informatics Publishing Limited

Kohio Niessan ¹, Kagone Abdoul Karim ¹, Koalaga Zacharie ¹, Zougmore Francois ¹, Njomo Donatien ²

Affiliations
1 Universite de Ouagadougou, Burkina Faso, BF
2 Universite de Yaounde, CM

Abstract

In this paper we calculate the transport coefficients of plasmas formed by air and water vapor mixtures. The calculation, which assume local thermodynamic equilibrium (LTE) are performed in the temperature range from 500 to 12000 K. We use the Gibbs free energy minimization method to determine the equilibrium composition of the plasmas, which is necessary to calculate the transport coefficients. We use the Chapman-Enskog method to calculate the transport coefficients. The results are presented and discussed according to the rate of water vapor. The results of the total thermal conductivity and electrical conductivity show in particular that the increasing of the rate of water vapor in air can be interesting for power cut. This could be improve the performance of plasma during current breaking in air contaminate by the water vapor.

Keywords

Plasma, Equilibrium Composition, Transport Coefficients.

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Sanou Serge Roland ¹, Zougmore Francois ¹, Kebre Marcel ¹, Koalaga Zacharie ¹, Doumounia Ali ¹

Affiliations
1 Laboratoire de Materiaux et Environnement (LAME), UFR-SEA, Universite de Ouagadougou, Ouagadougou, BF

Abstract

This paper presents a comparison of the performances of coded OFDM (Orthogonal Frequency Division Multiplexing) for optical broadband transmission using Random Neural Network (RNN), a variant of RNN, Soft Decision Decoding (SDD) and LDPC channel decoding techniques. The performance evaluation is based firstly on the Error Vector Magnitude (EVM) to assess the effects of imperfections in the optical channel, and secondly on the estimated Bit Error Rate (BER) based on OSNR. The simulations are performed at a rate of 10Gb/s over 1000 km using VPI software co-simulation environment. The results show that the error correcting codes, particularly LDPC codes, are well suited and efficient for broadband.These codes provide satisfactory solutions for OFDM, reducing the effects of chromatic dispersion (CD), polarization mode dispersion (PMD), Intersymbol Interference(ISI) and non-linearities.

Keywords

OFDM, BER, EVM, Optical Fiber, Decoder, Neural Network, SDD, LDPC, Broadband.

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