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Bouderraoui H.,INPT | Chami M.,INPT
SITA 2016 - 11th International Conference on Intelligent Systems: Theories and Applications | Year: 2016

Smart grid is considered as the next generation power grid by using new information and communication technologies as well as ensuring better sources' energy management and control. In order to test and validate new smart grid concepts and approaches, simulation has become a vital and suitable tool for the future grid research. Our Smart Grid Simulator (SGS) is designed to provide fine grained information on different power grid components such as energy consumption and production, time-use of appliances, time varying electricity prices, etc. In this paper several household's profiles has been set in order to model and emulate a wide range of different users. The architecture that supports our SGS concept is presented, as well as a preliminary test results of emulating different household's profiles in term of power consumption. The behavior of different appliances considered in each profile has been modeled in order to be as close as possible to real world model. © 2016 IEEE.

Bedoussac L.,INPT | Justes E.,French National Institute for Agricultural Research
Plant and Soil | Year: 2010

In a previous paper [Bedoussac L, Justes E (2009) Plant Soil, doi: 10.1007/s11104-009-0082-2, we showed that intercropping of durum wheat and winter pea increased the yield and protein concentration of durum wheat when early N availability was less than 120 kg N ha-1. The aim of the present work was to understand these results by analysing intercrop species dynamics for growth, light and N acquisition. A 2-year field experiment was carried out in southwest France with different fertilizer-N levels in order to compare wheat (Triticum turgidum L.) and pea (Pisum sativum L.) grown as sole crops and as an intercrop in a row substitutive design. The advantages of intercropping in low N conditions were due mainly to: (1) better light use (up to 10%), thanks to species dynamic complementarity for leaf area index and height; (2) growth complementarity over time (higher growth rate of wheat until pea flowering and then of pea until wheat flowering); and (3) dynamic complementary N acquisition associated with better wheat N status throughout growth. Disadvantages, underlining poorer complementarity within the intercrop stand, were observed with ample available N in early growth. This induced higher cereal growth during winter, which led to increase interspecies competition by reducing pea light absorption and, consequently, its biomass production. © Springer Science+Business Media B.V. 2010.

Hyadi A.,King Abdullah University of Science and Technology | Benjillali M.,INPT | Alouini M.-S.,King Abdullah University of Science and Technology | Da Costa D.B.,Federal University of Ceará
IEEE Transactions on Wireless Communications | Year: 2013

Multihop relaying is an efficient strategy to improve the connectivity and extend the coverage area of secondary networks in underlay cognitive systems. In this work, we provide a comprehensive performance study of cognitive multihop regenerative relaying systems in an underlay spectrum sharing scenario with the presence of multiple primary receivers. Both interference power and peak power constraints are taken into account. In our analysis, all the links are subject to independent, non-identically distributed Nakagami-m fading. We derive closed-form expressions for the outage probability, high-order amount of fading, bit error rate, symbol error rate, and ergodic capacity. Different scenarios are presented to illustrate the obtained results and Monte Carlo simulations confirm the accuracy of our analytical derivations. © 2013 IEEE.

Naamane F.E.,National School in Computer Science | Et-Tolba M.,INPT | Belkasmi M.,Mohammed V University
IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, PIMRC | Year: 2013

This paper deals with the bit error rate (BER) semi-analytical prediction in a turbo coded digital communication system. We propose a new prediction method which is based on the kernel estimator of the probability density function (pdf). We assume that no knowledge on the distribution of the received soft samples is available. In the proposed method, we derived a new expression of the smoothing parameter which takes into account of the soft samples at the detector output. In this paper, we use the cross validation (CV) criterion for selecting the optimal smoothing parameter. We prove that the proposed method outperform MISE (mean integrated squared error) criterion in terms of squared error. After, application to BPSK modulation and coded SC-FDMA (Single carrier frequency division multiple access) system; Simulation results, shows that the BER obtained with the proposed method are close to that measured using Monte-Carlo method. Moreover, the use of cross validation criterion decreases the squared error between the true pdf and the estimated one. © 2013 IEEE.

Jabi M.,INRS EMT | Szczecinski L.,INRS EMT | Benjillali M.,INPT
IEEE Communications Letters | Year: 2012

We propose a simple and accurate approximation of the outage probability at the output of L-branch diversity combining receivers with arbitrarily fading channels. The method is based on the saddlepoint approximation, which only requires the knowledge of the moment generating functions of the signal-to-noise ratio at the output of each diversity branch. In many particular cases of practical interest, the outage approximation is obtained in closed-form expressions. Numerical results illustrate the accuracy of the proposed method for practical outage values in a variety of fading scenarios. © 2012 IEEE.

Rees D.A.S.,University of Bath | Mojtabi A.,INPT
Transport in Porous Media | Year: 2011

We consider convection in a uniform fluid-saturated porous layer which is bounded by conducting plates and heated from below. The primary aim is to determine the identity of the postcritical convection planform as a function of the thicknesses and conductivities of the bounding plates relative to that of the porous layer. This work complements and extends an early paper by Riahi (J Fluid Mech 129:153-171, 1983) who considered a situation where the porous layer is bounded by infinitely thick conducting media. We present regions in parameter space wherein convection in the form of rolls is unstable and within which cells with square planform form the preferred pattern. © 2011 Springer Science+Business Media B.V.

Bahja F.,Laboratoire LRIT Unite Associee Au CNRST | Ibn Elhaj E.H.,INPT | Di Martino J.,University of Lorraine
Proceedings of 2012 International Conference on Multimedia Computing and Systems, ICMCS 2012 | Year: 2012

In the current paper, we propose a new pitch tracking technique based on a wavelet transform in the temporal domain. Our algorithm is designed to determine the pitch frequency of the speech signal using a simple voicing decision algorithm. The pitch period is extracted from the cepstrum excitation signal processed by a wavelet transform; then the pitch contour is refined by thresholding and correction algorithms without any post-processing. The results obtained show that the proposed algorithm provides very good pitch contours compared to those furnished by the Bagshaw database. © 2012 IEEE.

Girard C.,INPT | Zugari A.,Abdelmalek Essaadi University | Raveu N.,INPT
Progress In Electromagnetics Research B | Year: 2013

This article focuses on the 2D hybrid technique between the Frequency Domain Transmission Line Matrix Method (FDTLM) and the Wave Concept Iterative Procedure (WCIP). 3D hybridization has already been studied, but results may be improved through a better knowledge of method order. Consequently, developing 2D hybridization aims at understanding the hybridization in simplest problems, especially because Transverse Electric (TE) and Transverse Magnetic (TM) are uncoupled. Our study dwells on accuracy and convergence order of the 2D hybrid method, which will help for 3D mesh use. In this perspective, the scattering nodes and electromagnetic fields expressions are established in the 2D general case with anisotropic materials. As a result, validation examples are presented to check the approach.

Bensaid H.,INPT | Peltier N.,LIG
Journal of Automated Reasoning | Year: 2014

The superposition calculus (Bachmair and Ganzinger, J. Log Comput. 3(4), 217–247, 1994; Nieuwenhuis and Rubio 1994) is the state-of-the-art inference system used in saturation-based theorem proving for first-order logic with equality.We present an extension of this calculus that permits us to reason on formulae built on primal grammars (Hermann and Galbavý, Theor. Comput. Sci. 176(1–2), 111–158, 1997) a schematization language that has been devised to denote infinite sequences of structurally similar terms, defined by primitive recursion. We prove that the calculus is sound and refutationally complete. © 2014, Springer Science+Business Media Dordrecht.

Ait-Idir T.,INPT | Ait-Idir T.,Orange Group | Chafnaji H.,INPT | Chafnaji H.,Orange Group | And 2 more authors.
IEEE Transactions on Wireless Communications | Year: 2010

In this paper, efficient turbo packet combining for single carrier (SC) broadband multiple-input-multiple-output (MIMO) hybrid-automatic repeat request (ARQ) transmission with unknown co-channel interference (CCI) is studied. We propose a new frequency domain soft minimum mean square error (MMSE)-based signal level combining technique where received signals and channel frequency responses (CFR)s corresponding to all retransmissions are used to decode the data packet. We provide a recursive implementation algorithm for the introduced scheme, and show that both its computational complexity and memory requirements are quite insensitive to the ARQ delay, i.e., maximum number of ARQ rounds. Furthermore, we analyze the asymptotic performance, and show that under a sum-rank condition on the CCI MIMO ARQ channel, the proposed packet combining scheme is not interference-limited. Simulation results are provided to demonstrate the gains offered by the proposed technique. © 2006 IEEE.

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