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Cui H.,South China University of Technology | Cui H.,Guangzhou University | Wei G.,South China University of Technology | Wang Y.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique
IEEE Transactions on Vehicular Technology | Year: 2011

This paper addresses issues on the assessment of the performance degradation caused by decreasing channel state information (CSI) of cooperative communication systems that employ opportunistic decode-and-forward (DF) relay under Nakagami-m fading conditions. Exact closed-form performance expressions are derived for the end-to-end average symbol error probability (ASEP) for both partial- and full-CSI relaying schemes over a sufficiently wide range of signal-to-noise ratio (SNR) regions. Finally, the performances of the two schemes in terms of ASEP are compared, and the system performance degradation caused by decreasing CSI is investigated through both analysis and simulations. © 2011 IEEE. Source


Bouzidi A.,University of Abderrahmane Mira de Bejaia | Maouche B.,University of Abderrahmane Mira de Bejaia | Feliachi M.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique
IEEE Transactions on Magnetics | Year: 2015

This paper describes a pulsed eddy current nondestructive evaluation of an annular groove dimensions using a simplex inversion method associated with a semianalytical direct model, in axisymmetric case. The proposed semianalytical formulation, used for direct calculations, is developed from coupled electric circuits modeling. It uses the current excitation allowing the determination of the sensor voltage. The feature of the variation of voltage provides information on the electromagnetic and geometrical properties of the device. The transient sensor voltage is then calculated, allowing the evaluation of the groove dimensions of the considered work piece. The peak's amplitude and the zero and peak crossing times are used to determine these properties. © 2015 IEEE. Source


Auger F.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique | Auger F.,Institut Universitaire de France
IEEE Transactions on Circuits and Systems II: Express Briefs | Year: 2010

This brief refocuses on three classes of s-to-z transforms. For each class, a closed-form expression is proposed, and a particular element, having an imaginary part of its frequency response very close to the ideal value, is presented. These s-to-z transforms are then related to all-pass infinite-impulse-response fractional delay filters, allowing another way to choose their degree of freedom. © 2010 IEEE. Source


Chanet B.,French Natural History Museum | Guintard C.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique
Comptes Rendus - Biologies | Year: 2012

Magnetic resonance imaging (MRI) examinations for anatomical studies on collection specimens are becoming more and more frequent. As the presence of metallic objects within the specimens can disturb the acquisition of images and damage both specimens and materials, a simple protocol using radiographs is here proposed to detect these objects in collection specimens before conducting an MRI examination. © 2011 Académie des sciences. Source


Bouhamame M.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique | Lo Coco L.,NXP Semiconductors | Amiot S.,NXP Semiconductors | Toutain S.,Institute of Recherche en Electronique et Electrotechnique de Nantes Atlantique
IEEE Transactions on Circuits and Systems I: Regular Papers | Year: 2012

A harmonic rejection mixer has been designed for DVB-T reception in VHFIII frequency band. It exhibits 21.3 dB noise figure, 29 dBm input IP3, and 67 dBm input IP2 over the 48-300 MHz frequency range. The third and fifth harmonics are suppressed by more than 60 dB thanks to phase error calibration. The 0.39 mm2 active die is fabricated in 40-GHz fT Bi-CMOS process consuming 38 mA from a 3.3 V supply including the LO chain. © 2011 IEEE. Source

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