MOHAMED Sahed

Mohamed DJABALLAH

Analysis of Smallest-Of Cell Averaging CFAR Detection in Homogeneous Gamma-Distributed Background

Radjaa NOUIBAT

Conception et analyse d’antennes à résonateur diélectrique pour les applications sans fil

Chayma Salhi , Essaadia Herizi

Extraction d’électrocardiogramme foetal (f-ECG) à l’aide de techniques de séparation de sources aveugles

REZGUI Yamina Nour elhouda

Cell planning and optimization for 4G and 5G mobile networks

Zakarya MENOUAR , Mokrane BELFERROUM

Assessing the Performance of Mean-Level CFAR Detectors in Gamma-Distributed Radar Clutter

Abir DAIRA , Fadwa BENMEBAREK

Analysis of Some CFAR Processors for High-Resolution Radar Systems

HADJI Abdallah , HABACI Imadeddine

Etude et conception d’une antenne MIMO avec des structures EBG pour les applications mobiles modernes

Mohammed Nizar BOUNIF , Toufik BEN RAYA

Optimization of Transmission Channel in a GSM Telecommunications Network

Rania BENHAMED , Selma BOUNIF

Étude et Analyse des Détecteurs Adaptatifs CFAR de Cibles Radar Noyées dans un Milieu Non Gaussien

M’HAMDI Ali , CHABANI Mouna

Performance du détecteur GM-CFAR avec intégration non-cohérente en milieux côtiers Pareto distribués

LAROUUSI Souhil , MOUSSAOUI Walid, DAOUDI Fateh

Réalisation d’un Système d’irrigation automatique à base de carte Arduino

ABDELKEBIR Chafika , BEN TAYEB Selwa

Réalisation d’un distributeur d’eau automatique à base de carte Arduino

SAFER Manel , SAADI Amina

Serrure électronique codée à base d’une carte Arduino UNO

Bensalem Akram , Djouilem Abou Bakr, Ben Tahar Adel

Etude d’un système de détection de gaz toxiques à base d’une carte Arduino UNO Rev3

SACI Yassine , LOGMA Mohcen, DECHOUCHA Ahlem

Réalisation d’un détecteur de Gaz à base de PIC16F877A

GUENDOUZ Cheima , CHEBABHI Hala

Conception et réalisation d’un détecteur de métaux à induction pulsée

CHOUIREB Elmahdi , BARKATI Badreddine, BOUGOUTTAYA Salahedine

Réalisation d’un détecteur de gaz à base du microcontrôleur ATMega328

This conference paper presents a comprehensive performance semi-analysis of the parameter-free Geometric Mean Constant False Alarm Rate (GM-CFAR) Type 2 detector in the context of multipulse radar detection within Pareto-distributed clutter. Unlike traditional CFAR detectors that rely on prior knowledge of clutter parameters, the GM-CFAR Type 2 uses the GM and the minimum order statistics to achieve robust detection without such dependencies. The study extends the monopulse GM-CFAR framework to the multipulse scenario, deriving a novel analytical expression for the probability of false alarm (PFA). However, due to the complex properties of clutter plus target statistics, the probability of detection (PD) is evaluated, here, using Monte Carlo simulations. The performance of the GM-CFAR Type 2 detector is then examined and compared against the existing parameter-dependent GM-, Smallest-Of (SO-) and Greatest-Of (GO-CFAR) Type 1 detectors, for both monopulse and multipulse scenarios. Results demonstrate that multipulse transimission significantly enhances detection performance, with the GM-CFAR Type 2 consistently outperforming its competitors, which highlights also its robustness and efficacy in challenging non-Gaussian clutter environments.

Citation

Mohamed SAHED , ,(2025-12-11), Noncoherent Parameter-Free GM-CFAR Processor for Multipulse Detection in Heavy-Tailed Pareto-Distributed Clutter,2025 2nd International Conference of Advanced Technology in Electronic and Electrical Engineering (ICATEEE),University of M'Sila, Algeria

In this conference paper, a new ranked data CFAR detector acting over a clutter following a Pareto distribution is developed. This detector, called PQRS-CFAR, is mainly based on the product of quotients of any two consecutively ranked samples within the detection window, hence the abbreviation PQRS. It is designed to work effectively in more realistic environments, where prior information about clutter parameters is no longer required. This makes it more suitable for practical scenarios. The authors provide here a semi-complete performance study of the proposed detection scheme in uniform clutter and in the presence of interferers within the sample window. Under uniform clutter assumption, an exact analytical expression for the false alarm probability of the introduced PQRS-CFAR is provided as well. The capabilities of the PQRS-CFAR detections are explored and evaluated against a number of existing CFAR competitors via numerical simulations.

Citation

Mohamed SAHED , ,(2024-12-14), Enhancing CFAR Detection Performance In Pareto Distributed Radar Clutter Using Product of Ranked Data Ratios,2024 International Conference on Telecommunications and Intelligent Systems (ICTIS),University of Djelfa, Algeria

This work presents a simple stacked rectangular dielectric resonator antenna (RDRA), which is dedicated for ISM band applications. To design this RDRA antenna, an EM simulator has been used. The proposed structure consists of a dielectric resonator, which is mounted on plastic substrate. This resonator is fed using a simple aperture-coupled feed line over a rectangular feeding slot made on a copper ground plane. The substrate has a relative permittivity 𝜀𝜀𝑟𝑟 of 2.65 and tan 𝛿𝛿 0.025. The proposed antenna has a compact size of 49.5x49.5x1.6𝑚𝑚𝑚𝑚3. The physical dimensions of the dielectric resonator are 30mm, 30mm, and 35mm for the length, width, and height, respectively. The dielectric resonator of the pro posed stacked RDRA has two layers. The first layer is constructed using plastic dielectric, which is used for the construction of our substrate. However, the sec ond layer is fabricated using FR-4, which has a relative permittivity 𝜀𝜀𝑟𝑟 of 4.4 and tan 𝛿𝛿 0.025. Due to the using of the second layer in our proposed stacked RDRA, an enhancement in the gain has been obtained, with a peak gain up to 5 dB and an efficiency up to 95% over the desired ISM band. In Addition, the obtained radiation pattern presents high stability over the operating frequency band.

Citation

Rania GUERNINE , ELhadi KENANE , Mohamed SAHED , Amal SILA , Rima SEGHIOUR , ,(2024-11-20), Tunable DRA with parasitic elements for ISM band applications,6th International Conference on Electrical engineering and control applications,Khenchela, Algeria.

In this paper, a novel and exact mathematical formulation of three mean level constant false alarm rate (CFAR) detectors has been developed considering a homogeneous gamma-distributed (GM) clutter. These detectors include the cell averaging (CA), the greatest-of (GO), and the smallest-of (SO)-CFAR detection schemes. To do so, we derived closed-form expressions for the probability density function (pdf), and the cumulative distribution function (cdf) of the sum of an exponential fluctuating target submerged in gamma-distributed sea clutter. Then, we developed exact and explicit expressions for the probability of false alarm (Pfa) and probability of detection (Pd) of the optimal fixed threshold detector and the three considered CFAR detectors. The correctness of our expressions is then examined and validated via numerical simulations. Assuming a homogeneous GM background, the detection performance of these three detectors is carried out, discussed, and compared with that of the optimal detector. Experimental results with Sentinel-1 synthetic aperture radar (SAR) data demonstrate the effectiveness of the proposed closed-form expressions and show that the considered CFAR schemes are efficient for ship detection in sea clutter backgrounds.

Citation

Mohamed SAHED , ELhadi KENANE , Ali KHALFA , , (2024-09-18), Performance analysis of mean level CFAR detectors in homogeneous gamma-distributed radar clutter, International Journal of Remote Sensing, Vol:45, Issue:24, pages:9338-9358, Taylor & Francis

This work proposes a simple rectenna system operating at 2.45 Ghz ISM bands, using the 50Ω antenna impedance followed by matching impedance and a voltage rectifier circuit. An L-section impedance matching circuit has been designed Depend on RF capacitor and inductor.it was placed between the antenna and the rectifier circuit to reduce the mismatch loss and to ensure maximum power transfer to enhance the rectifier efficiency. Then The rectifier circuit is constructed using voltage doubler configuration with Schottky diode SMS7630−005𝐿F. The proposed design has been simulated and optimized in an advanced design system (ADS ) software. It has been seen in the results that: the proposed system is performing very well at 2.45 𝐺Hz. The proposed rectenna is having a maximum efficiency up to 60% at 2.45 𝐺Hz with an input power of 0 𝑑Bm. Furthermore, with variations in the load resistance across a wide range of values from 5 𝑡o 10 𝑘 Ω with low input power equal to 0 𝑑Bm, the rectenna maintains an efficient power conversion. The output voltage value at 0 𝑑Bm is nearly 1.5 𝑉 with an optimum load 𝑅L = 5 𝐾Ω. The implemented system can be used efficiently for the RF energy harvesting applications.

Citation

Mohamed SAHED , ELhadi KENANE , ,(2024-06-30), Design of efficient 2.45GHz single-band rectenna system for ISM applications,International Conference on Applied Sciences (ICAS - 2024),Travnik, Bosnia and Herzegovina

This work proposes a simple rectenna system operating at 2.45 Ghz ISM bands, using the 50Ω antenna impedance followed by matching impedance and a voltage rectifier circuit. An L-section impedance matching circuit has been designed Depend on RF capacitor and inductor.it was placed between the antenna and the rectifier circuit to reduce the mismatch loss and to ensure maximum power transfer to enhance the rectifier efficiency. Then The rectifier circuit is constructed using voltage doubler configuration with Schottky diode SMS7630−005𝐿F. The proposed design has been simulated and optimized in an advanced design system (ADS ) software. It has been seen in the results that: the proposed system is performing very well at 2.45 𝐺Hz. The proposed rectenna is having a maximum efficiency up to 60% at 2.45 𝐺Hz with an input power of 0 𝑑Bm. Furthermore, with variations in the load resistance across a wide range of values from 5 𝑡o 10 𝑘 Ω with low input power equal to 0 𝑑Bm, the rectenna maintains an efficient power conversion. The output voltage value at 0 𝑑Bm is nearly 1.5 𝑉 with an optimum load 𝑅L = 5 𝐾Ω. The implemented system can be used efficiently for the RF energy harvesting applications.

Citation

Rania GUERNINE , ELhadi KENANE , Mohamed SAHED , Amal SILA , Rima SEGHIOUR , ,(2024-05-31), Design of efficient 2.45GHz single-band rectenna system for ISM applications,the International Conference on Applied Sciences (ICAS - 2024),Bosnia and Herzegovina

Due to technological advances, dielectric resonators antennas (DRA) have received an extensive interest for wireless communication applications. In this paper, a simple rectangular dielectric resonator antenna (RDRA) for ISM applications is proposed. The designed DRA operates at ISM frequency band covers the 2.45 𝐺𝐻𝑧. Our RDRA antenna is printed on plastic substrate, which has a thickness of 1.575 𝑚𝑚 with a relative permittivity 𝜀𝑟 of 2.65, and a dielectric loss tangent of 0.025. the proposed RDRA is fed using an aperture-coupled microstrip line. The proposed compact DRA has a size of 49.5 𝑥 49.5 𝑥 1.575 𝑚𝑚3. The dielectric patch has physical dimensions of 30𝑥30𝑥30 𝑚𝑚. The results of the proposed DRA is designed, analyzed and simulated using an EM simulator. The simulated results of indicates that the obtained DRA present a gain of 4.45 𝑑𝐵 and a total efficiency of 93%. In addition, this DRA presents a reflection coefficient S11 less than -10 dB (VSWR<2) over a frequency band of 315.2 𝑀𝐻𝑧 from 2.302 to 2.6171 𝐺𝐻𝑧, which covers the 2.45 𝐺𝐻𝑧 which is dedicated for ISM applications.

Citation

Mohamed SAHED , ELhadi KENANE , ,(2024-05-16), A novel Design of Dielectric Resonator Antenna at 2.45 Ghz for ISM Applications,3rd International Conference on Engineering, Natural and Social Sciences ICENSOS 2024,Konya, Turkey

Dielectric resonator antennas have become widely used in many applications due to their several advantages such as small size, low profile, low loss, and high gain. This work presents a parametric study of a simple rectangular dielectric resonator antenna (RDRA), which is dedicated for ISM applications. To design this antenna, an EM simulation has been used. The proposed structure consists of plastic substrate and a simple Aperture-coupled feed line over a rectangular feeding slot made at the ground plane. The substrate has a relative permittivity 𝜀𝑟 of 2.65. The proposed antenna has a compact size of 49.5 𝑥 49.5 𝑥 1.6 𝑚𝑚3. During this parametric study, our goal is to show the effect of some DRA parameters on some antenna characteristics in terms of resonance frequency and reflection coefficients. Among the DRA parameters which are used in our parametric study, we can cite the physical dimensions of the resonator and the dimensions of the slot. The physical dimensions of the dielectric patch are 30 𝑚𝑚, 30 𝑚𝑚 and 30 𝑚𝑚 for the length, width, and height, respectively. As a results, the parametric study on the different DRA parameters indicates that the dimension of the dielectric patch and the length of the slot have a considerable effect on the resonance frequency value and the adaptation of the DRA.

Citation

Mohamed SAHED , ELhadi KENANE , ,(2024-05-16), Parametric Study of a Dielectric Resonator Antenna for ISM Applications,3rd International Conference on Engineering, Natural and Social Sciences ICENSOS 2024,Konya, Turkey

Due to technological advances, dielectric resonators antennas (DRA) have received an extensive interest for wireless communication applications. In this paper, a simple rectangular dielectric resonator antenna (RDRA) for ISM applications is proposed. The designed DRA operates at ISM frequency band covers the 2.45 𝐺𝐻𝑧. Our RDRA antenna is printed on plastic substrate, which has a thickness of 1.575 𝑚𝑚 with a relative permittivity 𝜀𝑟 of 2.65, and a dielectric loss tangent of 0.025. the proposed RDRA is fed using an aperture-coupled microstrip line. The proposed compact DRA has a size of 49.5 𝑥 49.5 𝑥 1.575 𝑚𝑚3. The dielectric patch has physical dimensions of 30𝑥30𝑥30 𝑚𝑚. The results of the proposed DRA is designed, analyzed and simulated using an EM simulator. The simulated results of indicates that the obtained DRA present a gain of 4.45 𝑑𝐵 and a total efficiency of 93%. In addition, this DRA presents a reflection coefficient S11 less than -10 dB (VSWR<2) over a frequency band of 315.2 𝑀𝐻𝑧 from 2.302 to 2.6171 𝐺𝐻𝑧, which covers the 2.45 𝐺𝐻𝑧 which is dedicated for ISM applications.

Citation

Rania GUERNINE , ELhadi KENANE , Mohamed SAHED , Amal SILA , Rima SEGHIOUR , ,(2024-05-16), A novel Design of Dielectric Resonator Antenna at 2.45 Ghz for ISM Applications,3rd International Conference on Engineering, Natural and Social Sciences, ICENSOS 2024,Konya Turkey

Dielectric resonator antennas have become widely used in many applications due to their several advantages such as small size, low profile, low loss, and high gain. This work presents a parametric study of a simple rectangular dielectric resonator antenna (RDRA), which is dedicated for ISM applications. To design this antenna, an EM simulation has been used. The proposed structure consists of plastic substrate and a simple Aperture-coupled feed line over a rectangular feeding slot made at the ground plane. The substrate has a relative permittivity 𝜀𝑟 of 2.65. The proposed antenna has a compact size of 49.5 𝑥 49.5 𝑥 1.6 𝑚𝑚3. During this parametric study, our goal is to show the effect of some DRA parameters on some antenna characteristics in terms of resonance frequency and reflection coefficients. Among the DRA parameters which are used in our parametric study, we can cite the physical dimensions of the resonator and the dimensions of the slot. The physical dimensions of the dielectric patch are 30 𝑚𝑚, 30 𝑚𝑚 and 30 𝑚𝑚 for the length, width, and height, respectively. As a results, the parametric study on the different DRA parameters indicates that the dimension of the dielectric patch and the length of the slot have a considerable effect on the resonance frequency value and the adaptation of the DRA.

Citation

Rania GUERNINE , ELhadi KENANE , Mohamed SAHED , Amal SILA , Rima SEGHIOUR , ,(2024-05-16), Parametric Study of a Dielectric Resonator Antenna for ISM Applications,3rd International Conference on Engineering, Natural and Social Sciences (ICENSOS 2024),Konya Turkey

This letter presents an analytical study of the performance of the maximum-likelihood gamma constant false alarm rate (MLG-CFAR) detector operating over a homogenous gamma-distributed (GM) clutter. To accomplish this task, a novel closed-form expression for the probability of false alarm and a highly accurate approximation for the probability of detection are derived. Specifically, this proposed approximation is also given in a closed form. These expressions, which can be of great interest to the radar community, are given in terms of the Gauss hypergeometric function and the Tricomi function. Besides, the proposed expressions can be easily implemented and computed using most popular scientific software packages such as MATLAB, Maple, and Mathematica. Our propositions are then tested and validated using numerical computing and Monte Carlo simulations. The obtained results demonstrate a high accuracy and significant computational advantages of the proposed expressions compared to the alternative ones. Moreover, the detection performance of the MLG-CFAR detector is also conducted assuming a homogenous clutter with a known shape parameter.

Citation

Mohamed SAHED , ELhadi KENANE , Ali KHALFA , fdjahli@yahoo.fr, , (2023-08-07), Performance Analysis of the MLG-CFAR Detector in Homogenous Gamma-Distributed Sea Clutter, IEEE Geoscience and Remote Sensing Letters, Vol:20, Issue:2023, pages:1-5, IEEE

In this correspondence, two exact closed-form expressions for the probability of false alarm have been derived assuming a homogeneous Gamma distributed clutter. These expressions concern both the cell averaging CFAR (CA-CFAR) and the greatest of CFAR (GO-CFAR) detectors. As it will be shown, the proposed expressions are given in terms of the Gauss hypergeometric function and the second Appell function. Our expressions are then examined and validated numerically, by comparing them to their counterparts computed using numerical integrals and Monte-Carlo simulations, considering various scenarios.

Citation

ELhadi KENANE , Mohamed SAHED , Ali KHALFA , Farid Djahli, , (2023-08-01), Exact Closed-Form Pfa Expressions for CA- and GO-CFAR Detectors in Gamma-Distributed Radar Clutter, IEEE Transactions on Aerospace and Electronic Systems, Vol:59, Issue:4, pages:4674 - 4679, IEEE

Signal and image separation are extensively used in numerous imaging applications and communication systems. In this paper, a novel Blind Source Separation (BSS) approach, based on the Hybrid Firefly Particle Swarm Optimization (HFPSO), is proposed for separating mixed images. This approach processes the observed source without any prior knowledge about the model and the statistics of the source signal. The proposed method presents high robustness against local minima and converges quickly to the global minimum. Via numerical simulations, the proposed approach is tested and validated in comparison with standard Particle Swarm Optimization (PSO), Robust Independent Component Analysis (RobustICA), and Artificial Bee Colony (ABC) algorithms. The obtained results show that the presented technique outperforms the existing ones in terms of quality of image separation, the Signal-to-Noise Ratio (PSNR), and Structural Similarity Index Measure (SSIM). Moreover, the obtained results demonstrate that our approach provides also promising results in image separation from noisy mixtures.

Citation

Mohamed SAHED , , (2022), A Novel Blind Image Source Separation Using Hybrid Firefly Particle Swarm Optimization Algorithm, Engineering, Technology & Applied Science Research, Vol:12, Issue:6, pages:9680-9686, EOS Association

In this conference paper, the problem of channel optimization in GSM network in the city of M’sila is examined. In fact, this paper is a combination of theoretical study and practical activities which are carried out on site in collaboration with ATM Mobilis maintenance team. The main objective behind this study was made in order to enhance the quality of service of Mobilis cellular network by taking into account different parameters that come into play in the optimization process. We propose an optimization procedure by adding an extra E1 module, in order to overcome the degradation in the performance of GSM network and the bad quality of services (calls set-up problems, calls cuts, … etc). In doing that, we used the WebLCT software developed by Huawei. Obtained results show the efficiency of the proposed procedure and the quality of services is remarkably enhanced.

Citation

Mohamed SAHED , ,(2022), Transmission Channel Optimization of GSM Network in M’Sila City, Algeria,Mohamed SAHED,Unoversité de Ain Témouchent

Signal and image separation are extensively used in numerous imaging applications and communication systems. In this paper, a novel Blind Source Separation (BSS) approach, based on the Hybrid Firefly Particle Swarm Optimization (HFPSO), is proposed for separating mixed images. This approach processes the observed source without any prior knowledge about the model and the statistics of the source signal. The proposed method presents high robustness against local minima and converges quickly to the global minimum. Via numerical simulations, the proposed approach is tested and validated in comparison with standard Particle Swarm Optimization (PSO), Robust Independent Component Analysis (RobustICA), and Artificial Bee Colony (ABC) algorithms. The obtained results show that the presented technique outperforms the existing ones in terms of quality of image separation, the Signal-to-Noise Ratio (PSNR), and Structural Similarity Index Measure (SSIM). Moreover, the obtained results demonstrate that our approach provides also promising results in image separation from noisy mixtures.

Citation

ELhadi KENANE , Ali KHALFA , Mohamed SAHED , Farid Djahli, , (2022), A Novel Blind Image Source Separation Using Hybrid Firefly Particle Swarm Optimization Algorithm, Engineering, Technology & Applied Science Research, Vol:12, Issue:6, pages:9680-9686, ETASR

The Pareto distribution has been validated recently as a new statistical model for radar clutter backscattered from the sea surface for X-band high resolution maritime surveillance radar. Consequently, the derivation of the corresponding detection schemes has become of much interest, for operation under such clutter model, with the constant false alarm rate (CFAR) property. In this paper, a novel order statistic based CFAR detector operating in Pareto distributed clutter is introduced. This detector, which will be referred to us TGMR-CFAR, consists on using the trimmed geometric mean of ratios of consecutive order statistics obtained from samples of the sliding window. It is designed essentially to operate in a more realistic case, where nonhomogeneous clutter is considered. The author provides, here, a complete performance analysis for the TGMR-CFAR processor in homogenous and when interfering targets are present within the reference window. The exact expression of the false alarm probability of the proposed algorithms in a homogenous background is also presented. The detection performance of the TGMR-CFAR detector is investigated and compared with some exciting detectors by means of simulations.

Citation

Mohamed SAHED , ,(2021-08-12), Non-coherent Radar CFAR Detection Based on Ratios of Consecutive Order Statistics for Pareto Distributed Clutter,The First International Conference on Electronics, Artificial Intelligence and New Technologies (ICEAINT’2021),Oum El Bouaghi, Algeria

The interpolation method has been employed in non-integer-order moments estimators obtained in a previous work for the parameters of compound-Gaussian clutter model with inverse Gaussian texture (CGIG). Closed-form parameter estimators for the CGIG distributed clutter are derived with no special functions. These are achieved after a simple combination of three basic expressions: non-integer positive moments, non-integer negative moments and Bessel recurrence relation. Simulation results show that the derived estimators are well suited for multilook data and have a comparable accuracy as well as the numerically solved maximum-likelihood approach, but they are much simpler and faster to compute

Citation

Mohamed SAHED , AMAR Mezache , , (2018), Closed-form estimators of CGIG distributed parameters, Electronics Letters, Vol:54, Issue:2, pages:99-101, IET

In this paper, the problem to estimating the parameters of the K-distributed clutter plus noise is addressed. The existing nonasymptotic z-log-z estimators are only applicable to multiple-pulse data due to the use of the harmonic mean, which is undefined for single-pulse reverberation data. When either single- or multiple-pulse data are used, new closed-form estimators are derived in this work. They combine two interesting statistical ratios based on fractional positive- and negative-order moments so that the hypergemetric functions are absolutely eliminated. For single-pulse transmission, the proposed estimators demonstrate computational advantages compared to the existing approaches. Besides, in the multiple-pulse case, they yield about the same accuracy as the closed-form z-log-z-based estimators obtained in previous work.

Citation

Mohamed SAHED , AMAR Mezache , , (2017), Closed-form fractional-moment-based estimators for K-distributed clutter-plus-noise parameters, IEEE Transactions on Aerospace and Electronic Systems, Vol:53, Issue:4, pages:2094-2100, IEEE

In this study, closed-form expressions of the parameters estimators for Pareto distributed clutter plus noise are derived. To achieve this, the authors combine two statistical ratios based principally on non-integer positive and negative order moments. This allows absolute elimination of all related special functions contained in some existing estimators. For realistic applications, the proposed non-integer positive and negative order moments based estimators are suited to single-look and multi-look data. Simulation results show that the new estimators not only substantially reduce the computational requirements, but also yield accurate and lower variances parameters compared with the methods of moments and z log z obtained in previous works especially in the situations of heavy-tailed clutter.

Citation

Mohamed SAHED , AMAR Mezache , Faouzi Soltani, , (2017), Closed-form estimators for the Pareto clutter plus noise parameters based on non-integer positive and negative order moments, IET Radar, Sonar & Navigation, Vol:11, Issue:2, pages:359-369, IET

This study deals with the estimation problem of the inverse-Gaussian (IG)–compound-Gaussian (CG) distributed clutter parameters. Under the assumption of the absence of thermal noise, non-integer moments, log-moments and maximum-likelihood-based approaches are employed for model parameter estimation in the cases of single pulse and non-coherent integration of N pulses. The forms of the non-integer-order moments estimator and the [z log(z)] estimator are derived in terms of the Bessel and the exponential–integral functions, respectively. These formulas maintain monotonic nature over all values of the ratio between the shape parameter and the mean clutter power. For a single look data, the ML estimate combined with the mean clutter power is constructed in one dimension search for the shape parameter. By accommodating the mean square error metric, the estimation assessments are investigated via simulated and real data. Authors’ results illustrate that the derived non-integer-order moments estimator is asymptotically efficient for the IG–CG distributed clutter parameters particularly in heavy tailed clutter situations.

Citation

AMAR Mezache , Mohamed SAHED , Ahmed Bentoumi, , (2017), Parameter estimation for compound-Gaussian clutter with inverse-Gaussian texture, IET Radar, Sonar & Navigation, Vol:11, Issue:4, pages:586-596, IET

In this work, we extend the performance analysis of some single-pulse transmission signal processors that produce CFAR under the assumption of Pareto distributed clutter for more realistic approach where non coherent integrated pulses are transmitted. A logarithmic transformation approach, that enables true Gaussian CFAR processes to be translated for target detection in Pareto clutter scenario, is used. Consequently, the resulting CFAR processes depend all explicitly on the Pareto scale parameter. Thus, it will be assumed that this parameter is fully known. In the case of multi looks case, analytic expressions for the false alarm probability of the Geometric Mean (GM)-, Greatest Of (GO)- and Smallest Of (SO)-CFAR schemes are derived. Through simulated data, we evaluate the superiority of these developed CFAR detectors against the existing single-pulse CFAR detectors.

Citation

Mohamed SAHED , AMAR Mezache , ,(2015), Analysis of CFAR detection with multiple pulses transmission case in Pareto distributed clutter,2015 4th International Conference on Electrical Engineering (ICEE),Boumerdes, Algeria

In this paper, we present a novel [z log(z)]-based approach to the evaluation of estimators of the K-distributed clutter plus thermal noise parameters. In doing this, we start by deriving expressions of log-based moments of the received data, i.e., means of [log(z)] and [z log(z)], which are related to the parameters of the K plus noise distribution, the digamma, and the hypergeometric functions. Then, by accommodating a single pulse and noncoherent integration of N pulses, respectively, we first determine the new estimators in terms of log-based moments and first- and second-order moments. As the computation of these nonlinear estimates requires the use of numerical routines, we resort to the inverse of the harmonic mean of the received data to get equivalent but more interesting estimates in which expressions are independent of the confluent hypergeometric functions. Monte Carlo simulations show that the proposed estimators are more efficient than existing methods for various clutter plus noise situations.

Citation

Mohamed SAHED , AMAR Mezache , Toufik Laroussi, , (2015), A novel [z log (z)]-based closed form approach to parameter estimation of K-distributed clutter plus noise for radar detection, IEEE Transactions on Aerospace and Electronic Systems, Vol:51, Issue:1, pages:492-505, IEEE

In this study, the authors present two novel methods to estimate the parameters of the compound K-clutter in presence of additive thermal noise. Based on the parametric fitting to the tail of the clutter distribution, the first method estimates simultaneously the unknown parameters. This is achieved by comparing the experimental cumulative distribution function, drawn from the recorded data intensity, to a set of curves derived from the mathematical model. To this effect, a multidimensional unconstraint non-linear algorithm; namely the Nelder–Mead method is used to minimise the residuals between the real data and the fitted curve with unknown parameters. Considering always the presence of thermal noise and based on the neuronal approaches and fuzzy inference systems, the second method also yields an accurate estimation and guarantees an inexpensive computation of the unknown parameters when the clutter-to-noise ratio (CNR), is known a priori. To assess the obtained results, the authors illustrate the effectiveness of these new methods through Monte-Carlo simulations.

Citation

Mohamed SAHED , AMAR Mezache , Toufik Laroussi, Djamel Chikouche, , (2011), Two novel methods for estimating the compound K-clutter parameters in presence of thermal nois, IET radar, sonar & navigation, Vol:5, Issue:9, pages:934-942, IET

In this paper, we have introduced a method for estimating the parameters of the sea clutter compound K-distribution in presence of thermal noise by using the artificial neural networks (ANN) and the fuzzy neural networks (FNN) multi inputs/ single outputs (MISO) approaches. In order to accurate more the estimation, the FNN multi inputs/ multi outputs (MIMO) is also considered in this work to estimate simultaneously the shape and the scale parameters of the compound K-distribution. Using the back propagation (BP) algorithm and the genetic learning algorithm (GA), the proposed estimation procedures are trained based on the moments and the ratio of arithmetic and geometric means of the samples. However, the estimation accuracy obtained by these techniques are validated and compared for various values of the shape parameter with different sample sizes.

Citation

AMAR Mezache , Mohamed SAHED , , (2010), Parameter Estimation in K-Distributed Clutter with Noise using Nonlinear Networks, Journal of Automation & Systems Engineering, Vol:4, Issue:1, pages:1-12, JASE

In this paper, we propose an efficient approach to the estimation of the compound K-distribution parameters in presence of additive thermal noise. This is acquired by means of a multidimensional unconstrained nonlinear minimization algorithm based upon the Nelder-Mead direct search method. In doing this, we minimize the sum of squared residuals. The best fit is simply achieved by a direct comparison of the experimentally measured cumulative distribution function (CDF) of the recorded data with the set of curves derived from the model of interest. A good minimization can be reached only if the real CDF is accurately estimated. We show, particularly, that the new approach yields the best spiky clutter parameter estimation. The proposed estimator is more efficient than existing estimation methods.

Citation

AMAR Mezache , Mohamed SAHED , ,(2009), K-distribution parameters estimation based on the Nelder-Mead algorithm in presence of thermal noise,2009 International Conference on Advances in Computational Tools for Engineering Applications,Zouk Mosbeh, Lebanon

This paper investigates a new technique for estimating the shape parameter of a K-distribution based on fuzzy neural network (FNN). In order to improve the estimation accuracy with inexpensive computational requirement, the FNN estimator is used to accurate the solutions of the nonlinear equations and the inverse functions (g k (nucirc))of the Raghavanpsilas and ML/MOM (Maximum-Likelihood and Method Of Moments)methods respectively. A long this line, the estimated arithmetic and geometric means of data and the estimated function g k (nucirc) of the two estimators are combined and modeled by the FNN shape parameter estimator where an off-line optimization of their weights via genetic algorithms (GA) is considered. The simulation results are carried out to demonstrate the validity of the approach as well as the successfulness of the FNN estimator for low mean square error (MSE) of parameter estimates when compared with existing Raghavanpsilas, HOFM (Higher Order and Fractional Moments), ML/MOM and [(z)log(z)] estimators. Additionally, the FNN method yields parameter estimates with lower computational complexity which allows rapid calculation in real time implementation.

Citation

AMAR Mezache , Mohamed SAHED , ,(2008), A Method for Estimating the Parameters of the K-Distribution Using a Nonlinear Network Based on Fuzzy System and Neural Networks,2008 2nd International Conference on Signals, Circuits and Systems,Monastir, Tunisia