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Cognitive radio (CR) is a form of wireless communication in which a transceiver can wisely detect communication channels that are in use and those which are not, and immediately move into vacant channels while avoiding occupied ones. In such systems, spectrum sensing (SS) is a crucial operation. It consists to detect the available frequency bands. Many spectrum sensing techniques are presented in...
In this paper, we focus our attention on the detection and tracking feature points algorithm for video sequence environment. For face image extraction, modified face detector based on Haar-like features is used. For feature points detection, we develop a new method based on the wavelet decomposition. For more accuracy, good features can be identified using Shi and Thomasi alogorithm around the detected...
In this paper, we provide two algorithms for blind equalization in a bounded noise environment of a Single Input Single Output (SISO) channel. These approaches are based an Optimal Bounding Ellipsoid (OBE) algorithms. This class is among the set Membership identification methods. The aim of these algorithms is to force the equalizer output constellation to match the input constellation by estimating...
Cylindrical and conical ultra-wideband (UWB) dielectric resonator antennas are presented in this paper. The first part of this work is a parametric study of cylindrical and conical dielectric resonator antennas for Ultra-Large Band applications ranging from 3.1GHz to 10.6GHz. The second part of the work consists of creating a reconfigurable rejection band inside this UWB in order to minimize interference...
Prostate cancer is becoming a threat to humanity. Today, the diagnosis of diseases is still be realized mostly by manual methods. Nevertheless, this traditional process is inefficient and not accurate. Its precision depends on the operator's expertise. Thus, applying machine learning algorithms for malignant cells detection and counting remains a significant purpose in medical image analysis research...
In this paper, we present a study and modeling of a wind system based on Doubly-Fed Induction Generator (DFIG), whose stator is directly connected to the grid in contrast to the rotor which is linked via power converters. The objective of this modeling is to improve the performance of the wind system by applying direct and indirect field oriented control to control the active and reactive power exchanged...
This paper presents a robust sensorless control technique for Permanent Magnet Synchronous Generator-wind Turbine (PMSG-WT). This strategy is based on Adaptive sliding interconnected observer to estimate the stator currents, the rotor speed and and the stator resistance. The vector control is applied to the control of the PMSG. The stability analysis of the applied observer is provided using the Lyapunov...
This study aims to apply the ripple correlation current (RCC) approach, which is an MPPT search algorithm used in photovoltaic systems. To extract the maximum power, a wind conversion structure based on a permanent magnet synchronous generator (PMSG), a three-phase rectifier and a boost converter is used. The choice of this structure is justified by the reliability, simplicity of implementation and...
In order to provide a testing for Wind Energy Conversion Systems (WECS) control strategies, a Wind Turbine Emulator (WTE) was designed and realized. The experimental implementation of the WTE for WECS consists of permanent magnet DC motor controlled by Pulse-Width Modulated (PWM). A DC motor is used to generate speed and torque required by the aero generator (PMSG) for producing electrical power....
This article presents a comparative study between the indirect field-oriented control (IFOC) with Proportional-Integral controller (PI) and the sliding mode control of a doubly fed induction machine (DFIG), dedicated to the production of the electrical energy in a wind system. Both types of control are presented in this paper to compare their performances in terms of follow-up of deposits and robustness...
This paper presents the design of an intelligent wind turbine pitch control of a permanent magnet synchronous generator (PMSG), used to regulate the DC bus voltage controller, output of the converter for a 150V pumping load, Where a fuzzy inference mechanism is used to estimate the upper limit of uncertainties. In addition, fuzzy inference makes it possible to adjust the output voltage, obtain greater...
Designing unknown input observers for integer-order systems has been subject to numerous and various research works. However, dealing with the fractional-order calculus, the literature lacks of such results. Indeed, only very few attempts have been done to design unknown input observers for linear fractional-order systems and Lipschitz nonlinear fractional-order systems. By this paper, a first solution...
This paper describes a method of Sensor Fault Detection, Isolation (FDI) and fault-tolerant control (FTC) architecture for vehicle lateral dynamics represented by the Takagi-Sugeno (TS) fuzzy model. Using the LMI formulation, the TS fuzzy model of the vehicle nonlinear dynamics is used to design an observer based controller, a method based on observer bank is then investigated for detection and isolation...
An existing method for tuning a generalized predictive control (GPC) law using desired closed-loop transfer functions is applied to preview systems. In the context of preview systems, it is supposed that future values of the reference signal are available a number of time steps ahead. This information can be used to reduce the error between the reference signal and the measured output by adding an...
Terrestrial Digital Video Broadcasting (DVB-T) is considered as one of the main two popular broadcasting standards, which facilitates the transmission of digital television in handheld receivers. In this work, a comparison will be held to enhance the mobile communications performance. This work aims to reduces the effect of a major problem found in the Orthogonal Frequency Division Multiplexing (OFDM)...
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