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Anghel C.,Graduate School of Engineers in Paris | Chilagani P.,Graduate School of Engineers in Paris | Amara A.,Graduate School of Engineers in Paris | Vladimirescu A.,Graduate School of Engineers in Paris
Applied Physics Letters | Year: 2010

An improved double-gate tunnel field-effect transistor structure with superior performance is proposed. The originality consists in the introduction of a low-k spacer that is combined with a high-k gate dielectric. Numerical simulations demonstrate that the use of the low-k spacer and high-k gate dielectric leads to a high on-current, ION, and reduced subthreshold slope. The proposed structure increases ION by a factor of 3.8 and reduces the subthreshold slope by a factor of 2 compared to other structures described in literature. © 2010 American Institute of Physics.


Trocan M.,Graduate School of Engineers in Paris | Mikovicova B.,Graduate School of Engineers in Paris
ISPA 2011 - 7th International Symposium on Image and Signal Processing and Analysis | Year: 2011

In this paper a smooth motion-compensated approach for video deinterlacing is proposed. The algorithm combines intra-field interpolation with overlapped-block-based motion- compensated inter-field interpolation, alleviating thus the artifacts specific to block-based motion-compensated deinterlacing schemes. Our algorithm takes into account the high-frequency content of an area and adapts the interpolation approach accordingly, such that the contours are preserved in the resulted progressive frame. Moreover, our proposal is optimized to lower heavy computation, which is the main drawback of motion-compensated deinterlacing algorithms. Experiments demonstrate a significant gain in reconstruction quality as compared to other deinterlacing implementations. © 2011 University of Zagreb.


Mroueh L.,Graduate School of Engineers in Paris | Belfiore J.-C.,Telecom ParisTech
IEEE Transactions on Wireless Communications | Year: 2012

In this paper, we study the feasibility of the interference alignment (IA) scheme for the selective fading interference channel with time-frequency selective links. Unlike the frequency selective channel case, we show here that, for the scalar time-frequency (TF) selective underspread channels, there is no need to scale the bandwidth as the number of users. However, a constraint on the delay-Doppler spread of the channel itself is required. A physical interpretation of this condition in the time-frequency domain is provided and is shown to be easily satisfied in practical system. Our results are based on the polynomial channel decomposition that we derive for the TF channel with large signal duration and bandwidth. © 2012 IEEE.


Anghel C.,Graduate School of Engineers in Paris | Hraziia,Graduate School of Engineers in Paris | Gupta A.,Graduate School of Engineers in Paris | Amara A.,Graduate School of Engineers in Paris | Vladimirescu A.,Graduate School of Engineers in Paris
IEEE Transactions on Electron Devices | Year: 2011

This paper presents the optimization of double-gate silicon (Si) tunnel field-effect transistors (TFETs). It shows that, for the heterodielectric structure, the I ON current is boosted by correctly positioning the source with respect to the gate edge. The second booster used in this paper is the Si thickness that is tuned in order to maximize the I ON current. The effects that lead to the performance increase are explained on a physical basis. We also demonstrate that the ambipolar character of the TFET is completely inhibited by using only one spacer of 30-nm length to separate the drain and the gate. © 2011 IEEE.


Mroueh L.,Graduate School of Engineers in Paris
Proceedings - IEEE International Symposium on Circuits and Systems | Year: 2016

In this paper, we propose a space time code construction for the 2 × 2 optical Multiple Input Multiple Output (MIMO) communication systems. The code construction, denoted Golden-Light Code, is compliant with the optical limited range constraints and the requirements of intensity modulation and direct detection. We base our construction on a two-parametric dependent full-rate 2 × 2 MIMO coding scheme with real components that conserves the real symmetrical constellation shape. Then, we show how to optimize the choice of these two parameters to jointly optimize the non-vanishing code determinant, and the bipolar to unipolar attenuation factor. © 2016 IEEE.


Jandhyala S.,Indian Institute of Science | Kashyap R.,Graduate School of Engineers in Paris | Anghel C.,Graduate School of Engineers in Paris | Mahapatra S.,Indian Institute of Science
IEEE Transactions on Electron Devices | Year: 2012

Surface-potential-based compact charge models for symmetric double-gate metal-oxide-semiconductor field-effect transistors (SDG-MOSFETs) are based on the fundamental assumption of having equal oxide thicknesses for both gates. However, for practical devices, there will always be some amount of asymmetry between the gate oxide thicknesses due to process variations and uncertainties, which can affect device performance significantly. In this paper, we propose a simple surface-potential-based charge model, which is applicable for tied double-gate MOSFETs having same gate work function but could have any difference in gate oxide thickness. The proposed model utilizes the unique so-far-unexplored quasi-linear relationship between the surface potentials along the channel. In this model, the terminal charges could be computed by basic arithmetic operations from the surface potentials and applied biases, and thus, it could be implemented in any circuit simulator very easily and extendable to short-channel devices. We also propose a simple physics-based perturbation technique by which the surface potentials of an asymmetric device could be obtained just by solving the input voltage equation of SDG devices for small asymmetry cases. The proposed model, which shows excellent agreement with numerical and TCAD simulations, is implemented in a professional circuit simulator through the Verilog-A interface and demonstrated for a 101-stage ring oscillator simulation. It is also shown that the proposed model preserves the source/drain symmetry, which is essential for RF circuit design. © 2006 IEEE.


Trocan M.,Graduate School of Engineers in Paris | Tramel E.W.,Mississippi State University | Fowler J.E.,Mississippi State University
Proceedings - International Conference on Image Processing, ICIP | Year: 2010

Compressed sensing is applied to multiview image sets and interimage disparity compensation is incorporated into image reconstruction in order to take advantage of the high degree of interimage correlation common to multiview scenarios. Instead of recovering images in the set independently from one another, two neighboring images are used to calculate a prediction of a target image, and the difference between the original measurements and the compressed-sensing projection of the prediction is then reconstructed as a residual and added back to the prediction in an iterated fashion. The proposed method shows large gains in performance over straightforward, independent compressed-sensing recovery. Additionally, projection and recovery are block-based to significantly reduce computation time. © 2010 IEEE.


Trocan M.,Graduate School of Engineers in Paris
International Journal of Intelligent Information and Database Systems | Year: 2014

Interlaced video acquisition and transmission, used as a simple way of increasing motion quality in video sequences, all by respecting the bandwidth constraints of progressive format representation, has been extensively used by analogue transmission systems. However, considering that nowadays the television sets and the flat screens can display only progressive format input, ensuring a smooth and high quality interlaced to progressive format conversion represents a challenging task. If till present, interpolation-based like solutions have been preferred for performing this conversion, in this paper we use an inverse problem formulation for video deinterlacing and propose a motion-compensated total-variation-minimisation-based reconstruction algorithm for solving it. A first recovery of the progressive frame is obtained using a contour-preserving interpolation method and further used for triggering a bidirectional motion-compensated prediction for the current field. A motion-compensated residual is calculated as difference between the current field and the projection of its temporal prediction using the same parity sampling matrix. This field residual is further reconstructed using a total-variation regularisation method and added back to the motion-compensated prediction to form the final progressive frame. As shown by the experimental results, the proposed deinterlacing method presents high quality progressive frame reconstructions compared to classical deinterlacing approaches. Copyright © 2014 Inderscience Enterprises Ltd.


Itoh K.,Graduate School of Engineers in Paris | Shaik K.A.,Graduate School of Engineers in Paris | Amara A.,Graduate School of Engineers in Paris
Proceedings - IEEE International Symposium on Circuits and Systems | Year: 2015

To achieve 0.5-V high-speed SRAMs, two proposals are demonstrated. One is a multi-power-supply five-transistor cell (5T cell), combined with a boosted word-line voltage and a mid-point sensing enabled by precharging bit-lines to VDD/2. The other is a partial activation of a multi-divided open-bit-line array without significant area penalty. Layout and postlayout simulation with a 28-nm fully-depleted planar-logic SOI MOSFET reveal that a 5T-cell 4-kb array in a 128-kb SRAM core is able to achieve x6 faster and x14 lower power than the counterpart 6T-cell array, suggesting a possibility of a 540-ps cycle time at 0.5 V. © 2015 IEEE.


Trocan M.,Graduate School of Engineers in Paris
Advances in Intelligent Systems and Computing | Year: 2013

With the apparition of digital television and flat displays, interlaced to progressive frame format conversion represents an importantant video systems feature. In this chapter, we use an inverse problem formulation for video deinterlacing and propose a two-step sparse-reconstruction algorithm for solving it. Firstly, an edge-preserving approximation of the progressive frame is obtained and used for triggering a bidirectional motion-compensated prediction for the current field. In a second step, a sparse residual is calculated as difference between the current field and the projection of its temporal prediction using the same parity sampling matrix. This field residual is further reconstructed using a total-variation regularization method and added back to the motion-compensated prediction to form the final progressive frame. The proposed deinterlacing method presents high quality results compared to other deinterlacing approaches.

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