Hedi Sakli - Academia.edu (original) (raw)

Papers by Hedi Sakli

2022 19th International Multi-Conference on Systems, Signals & Devices (SSD)

Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Mar 29, 2021

Le but de l'ECG est de fournir une représentation de l'activité cardiaque d'un patient. Les signa... more Le but de l'ECG est de fournir une représentation de l'activité cardiaque d'un patient. Les signaux desélectrodes sont combinés pour fournir un signal unidimensionnel qui peutêtre analysé par le praticien. Les diagnostics de maladie cardiaque reposent souvent sur l'analyse du complexe QRS, principale cause du rythme cardiaque. Les signaux bruts obtenus sur leś electrodes sont bruyants par différents facteurs: propagation, bruit musculaire, ligne de base dueà la respiration, etc. Nous nous intéressons icià minimiser les perturbations sur les signaux acquis auxélectrodes. Dans ce papier, nous présenterons les différentesétapes du débruitage basé sur un ECG réel et un développement dans Matlab des techniques proposées après son réception et avant de le transmettre au médecin. Les traitements sont réalisés sur l'ECG complet, cependant, dans un souci de lisibilité, seuls des extraits de l'ECG pertinents pour le phénomène illustré seront présentés. De ce fait, les signaux ECG disponibles sont généralement contaminés par des bruits aléatoires, et c'est dans ce contexte que notre contribution interviendra afin de minimiser l'influence de ces bruits sur les signaux ECG. Ainsi dans ce travail, et comme technique de débruitage, nous avons choisi d'utiliser la transformée en ondelettes discrète (DWT) en copies mono et multiples (multi capteurs) et le filtre médian et le filtre S-Golay. Les résultats de la simulation sont présentés puis commentés.

Intelligent Healthcare, 2022

Computational Intelligence and Neuroscience

Blockchain technology is now regarded as one of the most interesting and possibly innovative tech... more Blockchain technology is now regarded as one of the most interesting and possibly innovative technologies. It enables information to be stored and exchanged securely and transparently without the need for a centralized authority to regulate it. Some of the primary benefits of this technology are the atomicity of the stored data. Given its features, this technology has the potential to provide answers to challenges encountered in a very sensitive sector, namely, Internet of Vehicles (IoV). In IoV, vehicles and service providers autonomously capture and produce data without human intervention. This exchanged data must meet certain criteria such as decentralization, automation, security, and stakeholder trust management. To overcome these challenges, the integration of blockchain technology and multi-agent systems is a key solution. Based on smart contracts, the proposed solution consists of exploiting role-based access control (RBAC) and attribute-based access control (ABAC) technique...

Le Centre pour la Communication Scientifique Directe - HAL - Inria, Mar 29, 2021

2021 International Wireless Communications and Mobile Computing (IWCMC)

Internet of Vehicles (IoV), whose basic concepts are like those of the Internet of Things (IoT), ... more Internet of Vehicles (IoV), whose basic concepts are like those of the Internet of Things (IoT), refers to the ability of vehicles to communicate intelligently with each other through the exchange of information. To guarantee the services offered by IoV, it is necessary to consider the exchange of a large amount of information without human intervention and in a decentralized manner. To overcome these challenges, the use of blockchain technology is required. This technology is supported by the concept of smart contracts and implements the notion of decentralized applications (DApp). Our objective is, then, to design a decentralized application that brings together all the services accessible by vehicles. The user, depending on the type of service, can filter the search result and benefit from the appropriate service. Via this paper, we present the basic concepts to be used in the development of our platform such as blockchain, smart contracts, DApp and their relationship with IoV. We model the communication between the different actors of the system as well as the design of the proposed framework.

Computers and Electrical Engineering

2020 20th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2020

The rapid development of the Internet of Things (IoT) is affecting several sectors, in particular... more The rapid development of the Internet of Things (IoT) is affecting several sectors, in particular the Vehicular Ad-Hoc Network (VANET). The link between the IoT and VANET is giving rise to the Internet of Vehicles (10V). With the IoV,vehicles are able to communicate with each other and with other connected objects. To ensure the exchange of information flows between the different entities, autonomy, speed and the decentralized concept must be taken into account. Blockchain technology is a distributed register technology. It is the solution to overcome these challenges and to guarantee vehicular communication. This research work deals primarily with this new technology and its applications in IoV.We then present a multi-agent model of vehicle communication based on Blockchain technology and smart contracts.

Wireless Communications and Mobile Computing, 2022

This paper emphasizes the function of the split ring resonator (SRR) within the design of ultra-w... more This paper emphasizes the function of the split ring resonator (SRR) within the design of ultra-wideband (UWB) antennas. We presented an antenna that belongs to the category of UWB antenna with two rejected bands based on square SRR. At first, we presented a UWB antenna. This antenna is designed to operate in the band 2.3–11.5 GHz. Then, with the integration of two SRR cells, we were capable of filtering the bands 3.7–3.9 GHz and 8.7–8.9 GHz without losing the UWB characteristics outside these rejected bands. Next, to ensure the proper performance of the MIMO system, we studied the use of metamaterials in the design of MIMO (Multiple-Input Multiple-Output) antennas for miniaturization and antenna performance.

This paper presents a hybrid system solar cell antenna for 5G mobile communications networks. We ... more This paper presents a hybrid system solar cell antenna for 5G mobile communications networks. We propose here a solar cell antenna with either a front face collection grid or mesh patch. The solar cell antenna of our contribution combines both optical and radiofrequency signals. Thus, we propose two solar cell antenna structures in the frequency bands of future 5G standard respectively in both 2.6 and 3.5 GHz bands. Simulation using the Advanced Design System (ADS) software allows us to analyze and determine the antenna parameters proposed in this work such as the reflection coefficient (S11), gain, directivity and radiated power.

In this paper a rigorous analysis of the Transverse Operator Method (TOM) followed by the applica... more In this paper a rigorous analysis of the Transverse Operator Method (TOM) followed by the application of the Galerkin method, is developed for studying the propagation in a rectangular metal waveguide filled with anisotropic metamaterial. The wave equation and the dispersion relations for guided and evanescent modes in the guide are obtained and analyzed. The higher order modes are exploited. The numerical results are obtained and compared to theoretical predictions. Numerical examples show the validity of this method. Anisotropic metamaterials found important industrial applications such as circulators, isolators, phase shifters and antennas.

Groupe RF & Hyperfréquence-école supérieure d’électronique de l’ouest(ESEO)

2020 20th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2020

The present work proposes a rectifying circuit called rectenna. We propose an optical rectenna ba... more The present work proposes a rectifying circuit called rectenna. We propose an optical rectenna based of solar cell antenna operating at 3.5 GHz for the future 5th generation. This hybrid system solar cell antenna allows energy recovery (DC signal) as well as RF signal for Data Transmission. On the other hand, we have proposed a conversion circuit RF/DC for the unitile RF part. A parametric study has been shown that the efficiency can reach 66.2%.

Wireless Communications and Mobile Computing, 2021

In this paper, we propose a compact Multiple Input Multiple Output (MIMO) antenna system with hig... more In this paper, we propose a compact Multiple Input Multiple Output (MIMO) antenna system with high isolation for wireless applications in 5G connected devices. This MIMO antenna system with the size of 92 × 88 m m 2 consists of two elliptical antennas symmetrically arranged next to each other. Two decoupling methods which are neutralization and Defected Ground Structure (DGS) are applied to ensure diversity of the proposed MIMO antenna. The single and MIMO antennas are simulated and analyzed then fabricated and measured. A good agreement between measurements and simulations is obtained. These configurations, dedicated to covering the 3.4 GHz band -3.8 GHz, have shown very satisfactory performances more than -30 dB in terms of reduction of mutual coupling between the antennas constituting our system. MIMO diversity parameters, such as Envelope Correlation (ECC), Diversity Gain (DG), and total efficiency, are also studied for each proposed MIMO system. Thus, results demonstrate that...

International Journal of Electrical and Computer Engineering, 2021

A novel optical rectenna design is presented in this paper to operate in S-band communication. We... more A novel optical rectenna design is presented in this paper to operate in S-band communication. We propose a new method of combining antennas and solar cells to collect and transmit optical and radio frequency signals respectively. In this work, we determined the electrical power collected, it can be used for the polarization of a diode or a low-noise amplifier in a receiver block thus simulation results provides a gain of 6.74 dBi at 2.9 GHz with an effective return loss of -33.62 dB and radiated power of 7.08 mW. These good results make it possible to use the antenna particularly in point-to-point communication systems. A three topologies of rectifying circuits are proposed in the present work. The parametric study has been shown that the efficiency RF/DC conversion can reach 66% for an input power of 10 dBm and a load resistance of 3 kΩ.

Waveguide Technologies in Photonics and Microwave Engineering [Working Title], 2020

In this chapter, we present an extension of the rigorous analysis of the propagation of electroma... more In this chapter, we present an extension of the rigorous analysis of the propagation of electromagnetic waves in magnetic transverse (TM) and transverse electric (TE) modes in a metallic circular waveguide partially filled with anisotropic metamaterial. In our analysis, the design of waveguide filters with uniaxial discontinuities is based on the determination of the higher-order modes, which have been analyzed and exploited. Below the cutoff frequency, the back backward waves can propagate in an anisotropic material. The numerical results with our MATLAB code for TM and TE modes were compared to theoretical predictions. Good agreements have been obtained. We analyzed a waveguide filters filled with partially anisotropic metamaterial using the mode matching (MM) technique based on the Scattering Matrix Approach (SMA), which, from the decomposition of the modal fields (TE and TM modes), are used to determine the dispersion matrix and thus the characterization of a discontinuity in waveguide. We extended the application of MM technique to the anisotropic material. By using modal analysis, our approach has considerably reduced the computation time compared to High Frequency Structure Simulator (HFSS) software.

Advances in Science, Technology and Engineering Systems Journal, 2017

In this paper, a hybrid system solar cell antenna was studied. Our contribution lies in the combi... more In this paper, a hybrid system solar cell antenna was studied. Our contribution lies in the combination of both optical and radio-frequency signals in a solar cell antenna. Hence, we propose a new method to merge antenna and solar cell. The leaf-shaped patch solar cell antenna was dedicated at a time to the energy harvesting and the RF transmission. A performance analysis of the solar cell antenna was conducted using Advanced Design System (ADS) software. Simulation results showed a resonance at a frequency of 15.77 GHz with an effective return loss of-27.62dB and a gain of 5.77dBi.

International Journal of Microwave and Wireless Technologies, 2017

This paper presents an extension of the formulation of wave propagation in transverse electric (T... more This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes in the case of metallic circular waveguides filled with anisotropic metamaterials. The determined higher-order modes have been analyzed and exploited to the design of filters. Among the particularities of anisotropic material, the backward waves can propagate below the cut-off frequency. The numerical results for TE and TM modes have been compared with theoretical predictions. Good agreements were obtained. We analyzed a periodic structure containing waveguides filled with anisotropic metamaterial using the mode-matching technique. By using modal analysis, our approach reduced considerably the computation time compared to HFSS.

The International Journal on Communications Antenna and Propagation, Jun 30, 2014

In this paper a rigorous analysis of the TE modes is developed for studying the propagation in a ... more In this paper a rigorous analysis of the TE modes is developed for studying the propagation in a rectangular metallic waveguide fully-filled with anisotropic metamaterial. The wave equation and the dispersion relations are obtained and analyzed. The higher order modes are exploited. Among the particularities of this anisotropic material, the backward and forward waves can both propagate below the cutoff frequency in the guide. The numerical results for TEm0 are obtained and compared to theoretical predictions and to those previously published. Numerical examples show the validity of this method. In some cases, it has been found that the propagation constant in a rectangular waveguide metamaterial slab is complex although the media are lossless.

2022 19th International Multi-Conference on Systems, Signals & Devices (SSD)

Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Mar 29, 2021

Le but de l'ECG est de fournir une représentation de l'activité cardiaque d'un patient. Les signa... more Le but de l'ECG est de fournir une représentation de l'activité cardiaque d'un patient. Les signaux desélectrodes sont combinés pour fournir un signal unidimensionnel qui peutêtre analysé par le praticien. Les diagnostics de maladie cardiaque reposent souvent sur l'analyse du complexe QRS, principale cause du rythme cardiaque. Les signaux bruts obtenus sur leś electrodes sont bruyants par différents facteurs: propagation, bruit musculaire, ligne de base dueà la respiration, etc. Nous nous intéressons icià minimiser les perturbations sur les signaux acquis auxélectrodes. Dans ce papier, nous présenterons les différentesétapes du débruitage basé sur un ECG réel et un développement dans Matlab des techniques proposées après son réception et avant de le transmettre au médecin. Les traitements sont réalisés sur l'ECG complet, cependant, dans un souci de lisibilité, seuls des extraits de l'ECG pertinents pour le phénomène illustré seront présentés. De ce fait, les signaux ECG disponibles sont généralement contaminés par des bruits aléatoires, et c'est dans ce contexte que notre contribution interviendra afin de minimiser l'influence de ces bruits sur les signaux ECG. Ainsi dans ce travail, et comme technique de débruitage, nous avons choisi d'utiliser la transformée en ondelettes discrète (DWT) en copies mono et multiples (multi capteurs) et le filtre médian et le filtre S-Golay. Les résultats de la simulation sont présentés puis commentés.

Intelligent Healthcare, 2022

Computational Intelligence and Neuroscience

Blockchain technology is now regarded as one of the most interesting and possibly innovative tech... more Blockchain technology is now regarded as one of the most interesting and possibly innovative technologies. It enables information to be stored and exchanged securely and transparently without the need for a centralized authority to regulate it. Some of the primary benefits of this technology are the atomicity of the stored data. Given its features, this technology has the potential to provide answers to challenges encountered in a very sensitive sector, namely, Internet of Vehicles (IoV). In IoV, vehicles and service providers autonomously capture and produce data without human intervention. This exchanged data must meet certain criteria such as decentralization, automation, security, and stakeholder trust management. To overcome these challenges, the integration of blockchain technology and multi-agent systems is a key solution. Based on smart contracts, the proposed solution consists of exploiting role-based access control (RBAC) and attribute-based access control (ABAC) technique...

Le Centre pour la Communication Scientifique Directe - HAL - Inria, Mar 29, 2021

2021 International Wireless Communications and Mobile Computing (IWCMC)

Internet of Vehicles (IoV), whose basic concepts are like those of the Internet of Things (IoT), ... more Internet of Vehicles (IoV), whose basic concepts are like those of the Internet of Things (IoT), refers to the ability of vehicles to communicate intelligently with each other through the exchange of information. To guarantee the services offered by IoV, it is necessary to consider the exchange of a large amount of information without human intervention and in a decentralized manner. To overcome these challenges, the use of blockchain technology is required. This technology is supported by the concept of smart contracts and implements the notion of decentralized applications (DApp). Our objective is, then, to design a decentralized application that brings together all the services accessible by vehicles. The user, depending on the type of service, can filter the search result and benefit from the appropriate service. Via this paper, we present the basic concepts to be used in the development of our platform such as blockchain, smart contracts, DApp and their relationship with IoV. We model the communication between the different actors of the system as well as the design of the proposed framework.

Computers and Electrical Engineering

2020 20th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2020

The rapid development of the Internet of Things (IoT) is affecting several sectors, in particular... more The rapid development of the Internet of Things (IoT) is affecting several sectors, in particular the Vehicular Ad-Hoc Network (VANET). The link between the IoT and VANET is giving rise to the Internet of Vehicles (10V). With the IoV,vehicles are able to communicate with each other and with other connected objects. To ensure the exchange of information flows between the different entities, autonomy, speed and the decentralized concept must be taken into account. Blockchain technology is a distributed register technology. It is the solution to overcome these challenges and to guarantee vehicular communication. This research work deals primarily with this new technology and its applications in IoV.We then present a multi-agent model of vehicle communication based on Blockchain technology and smart contracts.

Wireless Communications and Mobile Computing, 2022

This paper emphasizes the function of the split ring resonator (SRR) within the design of ultra-w... more This paper emphasizes the function of the split ring resonator (SRR) within the design of ultra-wideband (UWB) antennas. We presented an antenna that belongs to the category of UWB antenna with two rejected bands based on square SRR. At first, we presented a UWB antenna. This antenna is designed to operate in the band 2.3–11.5 GHz. Then, with the integration of two SRR cells, we were capable of filtering the bands 3.7–3.9 GHz and 8.7–8.9 GHz without losing the UWB characteristics outside these rejected bands. Next, to ensure the proper performance of the MIMO system, we studied the use of metamaterials in the design of MIMO (Multiple-Input Multiple-Output) antennas for miniaturization and antenna performance.

This paper presents a hybrid system solar cell antenna for 5G mobile communications networks. We ... more This paper presents a hybrid system solar cell antenna for 5G mobile communications networks. We propose here a solar cell antenna with either a front face collection grid or mesh patch. The solar cell antenna of our contribution combines both optical and radiofrequency signals. Thus, we propose two solar cell antenna structures in the frequency bands of future 5G standard respectively in both 2.6 and 3.5 GHz bands. Simulation using the Advanced Design System (ADS) software allows us to analyze and determine the antenna parameters proposed in this work such as the reflection coefficient (S11), gain, directivity and radiated power.

In this paper a rigorous analysis of the Transverse Operator Method (TOM) followed by the applica... more In this paper a rigorous analysis of the Transverse Operator Method (TOM) followed by the application of the Galerkin method, is developed for studying the propagation in a rectangular metal waveguide filled with anisotropic metamaterial. The wave equation and the dispersion relations for guided and evanescent modes in the guide are obtained and analyzed. The higher order modes are exploited. The numerical results are obtained and compared to theoretical predictions. Numerical examples show the validity of this method. Anisotropic metamaterials found important industrial applications such as circulators, isolators, phase shifters and antennas.

Groupe RF & Hyperfréquence-école supérieure d’électronique de l’ouest(ESEO)

2020 20th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA), 2020

The present work proposes a rectifying circuit called rectenna. We propose an optical rectenna ba... more The present work proposes a rectifying circuit called rectenna. We propose an optical rectenna based of solar cell antenna operating at 3.5 GHz for the future 5th generation. This hybrid system solar cell antenna allows energy recovery (DC signal) as well as RF signal for Data Transmission. On the other hand, we have proposed a conversion circuit RF/DC for the unitile RF part. A parametric study has been shown that the efficiency can reach 66.2%.

Wireless Communications and Mobile Computing, 2021

In this paper, we propose a compact Multiple Input Multiple Output (MIMO) antenna system with hig... more In this paper, we propose a compact Multiple Input Multiple Output (MIMO) antenna system with high isolation for wireless applications in 5G connected devices. This MIMO antenna system with the size of 92 × 88 m m 2 consists of two elliptical antennas symmetrically arranged next to each other. Two decoupling methods which are neutralization and Defected Ground Structure (DGS) are applied to ensure diversity of the proposed MIMO antenna. The single and MIMO antennas are simulated and analyzed then fabricated and measured. A good agreement between measurements and simulations is obtained. These configurations, dedicated to covering the 3.4 GHz band -3.8 GHz, have shown very satisfactory performances more than -30 dB in terms of reduction of mutual coupling between the antennas constituting our system. MIMO diversity parameters, such as Envelope Correlation (ECC), Diversity Gain (DG), and total efficiency, are also studied for each proposed MIMO system. Thus, results demonstrate that...

International Journal of Electrical and Computer Engineering, 2021

A novel optical rectenna design is presented in this paper to operate in S-band communication. We... more A novel optical rectenna design is presented in this paper to operate in S-band communication. We propose a new method of combining antennas and solar cells to collect and transmit optical and radio frequency signals respectively. In this work, we determined the electrical power collected, it can be used for the polarization of a diode or a low-noise amplifier in a receiver block thus simulation results provides a gain of 6.74 dBi at 2.9 GHz with an effective return loss of -33.62 dB and radiated power of 7.08 mW. These good results make it possible to use the antenna particularly in point-to-point communication systems. A three topologies of rectifying circuits are proposed in the present work. The parametric study has been shown that the efficiency RF/DC conversion can reach 66% for an input power of 10 dBm and a load resistance of 3 kΩ.

Waveguide Technologies in Photonics and Microwave Engineering [Working Title], 2020

In this chapter, we present an extension of the rigorous analysis of the propagation of electroma... more In this chapter, we present an extension of the rigorous analysis of the propagation of electromagnetic waves in magnetic transverse (TM) and transverse electric (TE) modes in a metallic circular waveguide partially filled with anisotropic metamaterial. In our analysis, the design of waveguide filters with uniaxial discontinuities is based on the determination of the higher-order modes, which have been analyzed and exploited. Below the cutoff frequency, the back backward waves can propagate in an anisotropic material. The numerical results with our MATLAB code for TM and TE modes were compared to theoretical predictions. Good agreements have been obtained. We analyzed a waveguide filters filled with partially anisotropic metamaterial using the mode matching (MM) technique based on the Scattering Matrix Approach (SMA), which, from the decomposition of the modal fields (TE and TM modes), are used to determine the dispersion matrix and thus the characterization of a discontinuity in waveguide. We extended the application of MM technique to the anisotropic material. By using modal analysis, our approach has considerably reduced the computation time compared to High Frequency Structure Simulator (HFSS) software.

Advances in Science, Technology and Engineering Systems Journal, 2017

In this paper, a hybrid system solar cell antenna was studied. Our contribution lies in the combi... more In this paper, a hybrid system solar cell antenna was studied. Our contribution lies in the combination of both optical and radio-frequency signals in a solar cell antenna. Hence, we propose a new method to merge antenna and solar cell. The leaf-shaped patch solar cell antenna was dedicated at a time to the energy harvesting and the RF transmission. A performance analysis of the solar cell antenna was conducted using Advanced Design System (ADS) software. Simulation results showed a resonance at a frequency of 15.77 GHz with an effective return loss of-27.62dB and a gain of 5.77dBi.

International Journal of Microwave and Wireless Technologies, 2017

This paper presents an extension of the formulation of wave propagation in transverse electric (T... more This paper presents an extension of the formulation of wave propagation in transverse electric (TE) and transverse magnetic (TM) modes in the case of metallic circular waveguides filled with anisotropic metamaterials. The determined higher-order modes have been analyzed and exploited to the design of filters. Among the particularities of anisotropic material, the backward waves can propagate below the cut-off frequency. The numerical results for TE and TM modes have been compared with theoretical predictions. Good agreements were obtained. We analyzed a periodic structure containing waveguides filled with anisotropic metamaterial using the mode-matching technique. By using modal analysis, our approach reduced considerably the computation time compared to HFSS.

The International Journal on Communications Antenna and Propagation, Jun 30, 2014

In this paper a rigorous analysis of the TE modes is developed for studying the propagation in a ... more In this paper a rigorous analysis of the TE modes is developed for studying the propagation in a rectangular metallic waveguide fully-filled with anisotropic metamaterial. The wave equation and the dispersion relations are obtained and analyzed. The higher order modes are exploited. Among the particularities of this anisotropic material, the backward and forward waves can both propagate below the cutoff frequency in the guide. The numerical results for TEm0 are obtained and compared to theoretical predictions and to those previously published. Numerical examples show the validity of this method. In some cases, it has been found that the propagation constant in a rectangular waveguide metamaterial slab is complex although the media are lossless.