État académique
Thèse soutenue
Titulaire d'une HDR (ou équivalent) 2002-03-29
Laboratoire: personnel permanent
Direction de thèses (depuis 2007)
Propositions de sujets de thèse
Ellipse bleue: doctorant, ellipse jaune: docteur, rectangle vert: permanent, rectangle jaune: HDR. Trait vert: encadrant de thèse, trait bleu: directeur de thèse, pointillé: jury d'évaluation à mi-parcours ou jury de thèse.
Productions scientifiques
A Wideband Channel Model for Intravehicular Nomadic Systems
International audience
The increase in electronic entertainment equipments within vehicles has rendered the idea of replacing the wired links with intra-vehicle personal area networks. Ultra-wideband (UWB) seems an appropriate candidate technology to meet the required data rates for interconnecting such devices. In particular, the multiband OFDM (MB-OFDM) is able to provide very high transfer rates (up to 480 MBps) over relatively short distances and low transmit power. In order to evaluate the performances of UWB systems within vehicles, a reliable channel model is needed. In this paper, a nomadic system where a base station placed in the center of the dashboard wants to communicate with fixed devices placed at the rear seat is investigated. A single-input single-output (SISO) channel model for intra-vehicular communication (IVC) systems is proposed, based on reverberation chamber theory. The model is based on measurements conducted in real traffic conditions, with a varying number of passengers in the car. Temporal variations of the wireless channels are also characterized and parametrized. The proposed model is validated by comparing model-independent statistics with the measurements.
ISSN: 1687-5869 EISSN: 1687-5877 International Journal of Antennas and Propagation http://hal.upmc.fr/hal-00601394 International Journal of Antennas and Propagation, Hindawi Publishing Corporation, 2011, 2011, pp.468072. <10.1155/2011/468072>ARRAY(0x7f03ff2ba310) 2011
A Novel Approach for Designing Terahertz Plasmonic Structures
International audience
Conference ISMOT 2011 http://hal.upmc.fr/hal-00601436 Conference ISMOT 2011, Jun 2011, Prague, Czech Republic. 2011ARRAY(0x7f03fef0b8b0) 2011-06-20
New method for determining the complex dielectric function of ultra thin materials
International audience
Conference ETOPIM 2012 http://hal.upmc.fr/hal-00728950 Conference ETOPIM 2012, Sep 2012, Marseille, France. 2012ARRAY(0x7f03ff2a4068) 2012-09-02
Horn antenna design for BAN millimeter wave onbody communication
International audience
In this paper, a 60-GHz H-plane horn antenna is designed and studied in the context of Body Area Network (BAN). Targeting both size reduction and bandwidth widening, we obtain an optimal design that meet a good tradeoff between compactness, matching, bandwidth and multimode propagation. The study of return loss is conducted considering the dimensions of the horn antenna.
International Symposium on Antennas and Propagation and UNSC-URSI Radio Science Meeting Conference IEEE APS 2014 http://hal.upmc.fr/hal-01005423 Conference IEEE APS 2014, Jul 2014, Memphis, United States. pp.204.2, 2014ARRAY(0x7f03ff2ba400) 2014-07-06
Sensitivity Analysis of the Specular and Diffuse Parts of Clusters Multipath on the Exposure of a Child Body Model
International audience
Conference URSI http://hal.upmc.fr/hal-01025699 Conference URSI, Aug 2014, Beijing, China. 2014ARRAY(0x7f03fef0d758) 2014-08-16
Sensitivity of Whole Body Dosimetry to Channel Model Parameters
International audience
Impact of channel model parameters on the wholebody Specific Absorption Rate (SAR) is studied. Closed form expressions are derived for the mean value and the standard deviation of the SAR, taking into account the random nature of the channel parameters. Total sensitivity indices of the SAR with respect to the channel parameters are derived. They are estimated using a Monte-Carlo approach. Non-influential channel parameters are identified. They are then suppressed from channel models for dosimetry purpose.
ISSN: 0018-926X IEEE Transactions on Antennas and Propagation http://hal.upmc.fr/hal-01153808 IEEE Transactions on Antennas and Propagation, Institute of Electrical and Electronics Engineers, 2015, 63 (8), pp.3654 - 3661. <10.1109/TAP.2015.2434399 >ARRAY(0x7f03ff2b2b30) 2015-05-20
Propagation for On-Body Wireless Links at 60 GHz
International audience
A creeping wave model of the propagation of electromagnetic waves around human torso at 60 GHz is presented. The theoretical model should be of interest for Wireless Body Area Networks design at 60 GHz, if the nodes are located on different side of the torso. Both vertical and horizontal polarizations are investigated. Results of a measurement campaign confirm theoretical predictions.
2013 IEEE International Symposium on Antennas and Propagation and USNC-URSI National Radio Science Meeting Conference IEEE 2013 http://hal.upmc.fr/hal-00802789 Conference IEEE 2013, Jul 2013, Orlando (FL), United States. pp.1618 - 1619, 2013, <10.1109/APS.2013.6711468>ARRAY(0x7f03ff2aec10) 2013-07-07
Ranging Error Estimation in Indoor Environment at 10 GHz
International audience
The aim of this paper is to model the radio channel behavior in indoor environment, and evaluate its impact on a ranging system by means of error estimation. The simulations were performed in a tunnel scenario at 10 GHz, and the ray tracing model was adopted to obtain the channel response. In the time-of-arrival based ranging system, the accuracy of distance estimation strongly depends on the system resolution, so we investigate the relationship between the error and the system bandwidth. Moreover, an optimal energy threshold was defined, since the simulated receiver is a non-coherent energy detector.
Conference IPIN 2016 http://hal.upmc.fr/hal-01378458 Conference IPIN 2016, Oct 2016, Alcala de Henares (Madrid), Spain. 2016, 7th International Conference on Indoor Postioning and Indoor NavigationARRAY(0x7f03ff2b4b90) 2016-10-04
TDOA estimation method using 60 GHz OFDM spectrum
International audience
In the field of high data rate wireless communications, localization issues play a key role in achieving energy-efficient communication and geographic routing. time-difference of arrival (TDOA)-based localization methods present numerous advantages. In this paper, a new method of TDOA estimation is proposed. With this method, unlike conventional TDOA measurements, it is possible to perform communication and localization at the same time by using a multi-input single-output system. By transmitting ultra-wide-band orthogonal frequency-division multiplexing signals using spatial diversity, it is possible to extract TDOA from interference patterns in spectral domain. In addition, increasing the precision of localization is also studied using a multi-band approach. This whole study is made within the framework of the WiGig alliance specifications; however, it is compatible with other standards.
ISSN: 1759-0787 EISSN: 1759-0795 International Journal of Microwave and Wireless Technologies http://hal.upmc.fr/hal-00966673 International Journal of Microwave and Wireless Technologies, Cambridge University Press/European Microwave Association 2015, 7 (1), pp.31 - 35. <10.1017/S1759078714000324>ARRAY(0x7f03ff2aedd8) 2015-02-06
Channel Characteristics in Indoor Environment at 10GHz through Ray Tracing Model
International audience
Conference ISICV 2016 http://hal.upmc.fr/hal-01378478 Conference ISICV 2016, Nov 2016, Tunis, Tunisia. 2016, 8th International Symposium on signal, Image, Video and CommunicationsARRAY(0x7f03ff2b2aa0) 2016-11-21
Assessment of on-body skin-confined propagation for Body Area Network,
International audience
This letter assesses the potential of using surface waves to implement secure on-body communications. The propagation medium being the human skin, a transverse resonance method is used to analyze existing modes within the multilayered structure that composes the human tissues. Confinement capabilities as well as propagation losses are investigated for frequency up to 60 GHz. It is shown in particular that the 3-10 GHz band could allow secure communications up to few tens of centimeters. This frequency band is furthermore considered as Ultra Wideband channels in the IEEE 802.15.6 standard dedicated to Body Area Networks.
ISSN: 1536-1225 IEEE Antennas and Wireless Propagation Letters http://hal.upmc.fr/hal-01581037 IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2017, PP (99), pp.1 - 1. <10.1109/LAWP.2017.2735631>ARRAY(0x7f03ff2a4248) 2017-08-03
UWB Interferometry TDOA Estimation for 60 GHz OFDM Communication Systems
International audience
A simple technique to estimate the Time Difference of Arrival (TDOA) that necessitates only one reference device to perform 1D positioning of a mobile device is presented. Using a Multiple Input Single Output (MISO) system, this interferometric technique uses ultra wide-band signals and is particularly well suited for 60 GHz OFDM communications. The accuracy of the technique is assessed by simulation, using the IEEE 802.11ad channel, as well as by measurement.
ISSN: 1536-1225 IEEE Antennas and Wireless Propagation Letters http://hal.upmc.fr/hal-01253968 IEEE Antennas and Wireless Propagation Letters, Institute of Electrical and Electronics Engineers, 2015, 15, pp.1438 - 1441. <10.1109/LAWP.2015.2512327>ARRAY(0x7f03ff2ba388) 2015-12-24
Millington Effect and Propagation Enhancement in 60-GHz Body Area Networks
International audience
Millington effect for on-body propagation enhancement is presented in the 60-GHz band. Millington’s equations are developed to describe propagation above a flat inhomogeneous surface. This study focuses on mixed paths (human skin - metallic) for on-body scenarios. It is shown that adding metallic paths on the human skin can improve the power link budget between two nodes placed on the body. Two different schemes are studied experimentally to assess the analytical model using a flat phantom with electric properties of human skin and different lengths of metallic inserts. The first scheme considers a metallic plate between the transmitting and receiving antennas, while the second scheme proposes locating the metallic plates under the antennas. It is shown that the second scheme yields a better link budget than the first one for the same length of metal. Moreover, a numerical study is performed to assess the impact of the following different parameters: the location of the metal plate, size of the plate and the height of the antennas. Excellent agreement between numerical and experimental results has been shown. In the best cases, the presented techniques allow to improve the path loss of 10 to 20 dB.
ISSN: 0018-926X IEEE Transactions on Antennas and Propagation http://hal.upmc.fr/hal-01249928 IEEE Transactions on Antennas and Propagation, Institute of Electrical and Electronics Engineers, 2015, 64 (2), pp.776-781. <10.1109/TAP.2015.2505741>ARRAY(0x7f03ff2aeb20) 2015-12-04
On-body propagation characterization with an H-plane Substrate Integrated Waveguide (SIW) horn antenna at 60 GHz
International audience
A planar end-fire H-plane Substrate Integrated Waveguide (SIW) horn antenna is designed for 60 GHz on-body channel measurements. The proposed antenna radiates with a polarization normal to the human skin, and yet exhibits a low profile. Furthermore, a 6.1 GHz bandwidth (S11 < -10dB) is achieved, which enables wide-band channel characterization. The antenna has been fabricated and its performance is evaluated in the presence of a skin-equivalent phantom. Its suitability to perform on-body channel measurements is then discussed.
Conference EuMW 2015 http://hal.upmc.fr/hal-01202020 Conference EuMW 2015, Sep 2015, Paris (Palais des Congrès), France. 2015, 18th European Microwave Week 2015ARRAY(0x7f03ff2b4e60) 2015-09-06
Information Spatial focusing scheme for UWB Wireless Communications in Smart Environments
International audience
This letter presents an information spatial focusing method for future Smart Environments using UWB Wireless communications. This method allows to send high data rate information at predetermined specific spatial positions without localizing users, thereby protecting their privacy. The proposed approach is a combination of simplified Ultra Wide Band (UWB) Beamforming and signal processing. Compared to classical UWB Beamforming, the proposed method exhibits greater information focusing capabilities by increasing greatly the peak-to-floor ratio between main and side beams.
Antennas and Propagation Society Newsletter, IEEE http://hal.upmc.fr/hal-01069247 Antennas and Propagation Society Newsletter, IEEE, Institute of Electrical and Electronics Engineers, Inc. (IEEE), 2015, 14, pp.20 - 23. <10.1109/LAWP.2014.2354059>ARRAY(0x7f03ff2b4e78) 2015-01-27