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For linear plants, IMC have been shown good robustness properties against disturbances and model mismatches. However, when uncertain processes are concerned, the original IMC structure cannot be directly used for control system implementation. In this paper, an internal multiple model control (IMMC) based on linear model's library is introduced. This approach supposes the definition of a set of local...
The objective of this work is the hardware and software conception of an electronic controller system based on PIC16F877A microcontroller. The algorithm implemented is a discrete-time sliding mode control and it is applied on a nominal second order system. The simulation of the electronic system is performed in the PROTEUS environment. The validations of the hardware and software design of the controller...
This paper reviews an approach for the automatic orthogonal frequency division multiplexing (OFDM)signals classification for the cognitive radio applied to the standard IEEE 802.11 (the WiFi: Wireless Fidelity system) identification. Detected transmissions are classified as single-carrier or multi-carrier. In the case of multi-carrier transmission, different parameters may be used to ensure the identification...
In order to minimize the size and improve the efficiency of power consumption, most of wireless implantable Microsystems use Amplitude Shift Keying (ASK) modulator to transmit, through a RF link, data and energy to the internal implants. In this paper, we propose a new structure of wireless data and clock recovery dedicated for biomedical implants. It consists in a fully integrated ASK demodulator...
The aim of this work is to determine the frequency of an UWB (Ultra Wind Band) wave at which the wave can cross the biological tissue with limited losses and deformation. The biological tissue which is characterized by its thickness, its relative dielectric constant and its conductivity, is a sample of fat, localized at a distance of the antenna source which guarantees the inexistence of the attenuation...
This paper provides some new developments in the design of robust local unknown input observers for nonlinear systems based on first order Taylor approximation. The necessary and sufficient conditions for the existence of the observer are given. A numerical example is given to illustrate the attractiveness and the simplicity of the new design procedure.
Correlation power analysis is the well-known attack against cryptographic modules. An attacker exploits the correlation between the power consumed by a device and the data being processed. In the present paper, we present the experimental procedure of correlation power analysis using three different devices: FPGA, ASIC and a microcontroller. Results show that the power model used to calculate hypothetical...
Strain gauges and Wheatstone bridges constitute the basic instrumentation for electrical measurement of non-electrical quantities. After presenting the fundamental properties of the resistive strain gauge and the (un)balanced Wheatstone bridge, a significant diversity of measurement techniques and means are described, typical for the present-day worldwide instrumentation. Among them: classical (metallic)...
For a wireless sensor node of an overhead power line monitoring system a power module was developed using the electrostatic field around the conductor to supply the sensor system. Special requirements in functionality, reliability and the limited accessibility at the power line result in the development of a specific energy management strategy. First prototypes of the power module were realized and...
This article describes the prototype of the digital communication system based on the XBee module. It consists on a universal system that transmits all type of data including the medical information such as Electrocardiogram (ECG). To validate this system, we have chosen to transmit the ECG from a computer to another through the XBee modules just to evaluate the quality of the wireless communication...
Image denoising is an important pre-processing step for many image analysis and computer vision system. It refers to the task of recovering a good estimate of the true image from a degraded observation without altering and changing useful structure in the image such as discontinuities and edges. In this paper, we propose a new approach for image denoising based on the combination of two non linear...
The actuator fault estimation and a fault tolerant control (FTC) for delayed system are proposed in this paper. The estimation of actuator fault is realized by using the Luen-berger observer, and the fault tolerant control is obtained by adding an additive control law to the nominal one. The nominal control of delayed system is designed by using the Lambert-W function. finally, a simulation example...
As the complexity and operating frequency of integrated transceivers continue to increase accompanied with higher process variation, their calibration and characterization has become a considerable challenge to test engineers. In order to provide an efficient calibration method for 865-870 MHz low noise amplifier (LNA), which constitutes a mixed-signal circuit, a novel method is developed. This technique...
This paper presents a thermal circuit model to simulate the behaviour of an electric motor during the transient duty leading to steady-state operation under rated load. The proposed model allows the calculation of the temperature distribution in the radial direction of the electric motor, from the shaft inside to the motor frame surface. Several heat sources inside the motor as well as the heat conduction...
The production and deformation of perforated sheets introduces high levels of mechanical stress into the material. In a significant fraction, such stress levels lead to crack formation in the processed sheets. Additionally, the material might be thinned and weakened in the exposed areas; these areas tend to crack at any later dates. Currently no measuring device for the detection of such material...
In this paper we present an observer based synchronization method to synchronize chaotic systems with unknown linearity and fractional order chaotic systems. Our method consists in designing a Luenberger like observer appended with an estimator of the unknown nonlinear function is slowly varying and that the observer converges quickly and uses the backward difference formula to approximate the state...
In this paper, we propose a new approach for Arabic on-line handwriting segmentation via perceptual codes. To identify patterns, our human perceptual system is based on basic features called perceptual codes. Analysing handwriting, we notice the existance of elementary and global ones. Perceptual organization of the elementary perceptual codes in various constraints we obtain global ones, and to obtain...
In this work, we study speech analysis techniques to classify phoneme using a method of fuzzy logic. The used techniques are Mel Frequency Cepstral Coefficient (MFCC), Perceptual Linear Prediction (PLP) and RelAtive SpecTrAl-Perceptual Linear Prediction (RASTA-PLP). The fuzzy logic method is characterized by three fuzzy reference vectors: the maximal vector, the mean vector and the minimal vector...
Motion Estimation (ME) is a key factor for achieving enhanced compression ratio. However, ME involves high computational complexity. The main goal is to reduce the execution time without reducing image quality. In this paper, a proposed high parallel processing architecture is presented for four-step search block-matching motion estimation. The proposed method develops an architecture which using...
The wavelet frame is an extension to wavelet analysis which has become an interesting subject of research in signal processing and applied mathematics. Compared to wavelet base the wavelet frame have a variety of attractive feature such as better time-frequency localization, robust and stable reconstruction, smoothness, short support and symmetry. The goal of this paper is to use the advantages of...
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