Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632889
A. Kouzou, B. S. Khaldi, M. Mahmoudi, M. Boucherit
The main purpose of this paper is the study of the series active power filter (APF) compensation capability for different unbalance perturbations of three-phase three wire AC power systems such as voltage unbalance, phase-shift unbalance,sags and swells. Indeed SAPF has been proved to be an effective solution to compensate for different voltage disturbances in the power system, so that the power system voltages are forced to be balanced and sinusoidal and in phase with the direct component of the power system voltage presented before compensation. The capability of the Series APF is determined by the maximum rate of the apparent power that can be delivered. The challenge now is how these equipments can be dimensioned, this leads to the evaluation of the rate of the apparent power required to achieve this compensations under such conditions. This study present a comparison based on the approaches presented by the definition of the effective apparent power as defined in IEEE 1459-2000, the European school approach and the apparent power classical approach. The two first approaches were proved to be the best methods for the calculation of the apparent power presenting the suitable amount to be concerned in the design process of different devices and allow a good estimation of the Series APF dimensions with low economic burden. This paper presents some application which may be occur in the AC power systems, mainly for three-phase, three-wire AC power systems without neutral wire which can be used for the design process of the Series APF.
{"title":"Apparent power evaluation of Series Active Power Filter with recent definitions","authors":"A. Kouzou, B. S. Khaldi, M. Mahmoudi, M. Boucherit","doi":"10.1109/SSD.2008.4632889","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632889","url":null,"abstract":"The main purpose of this paper is the study of the series active power filter (APF) compensation capability for different unbalance perturbations of three-phase three wire AC power systems such as voltage unbalance, phase-shift unbalance,sags and swells. Indeed SAPF has been proved to be an effective solution to compensate for different voltage disturbances in the power system, so that the power system voltages are forced to be balanced and sinusoidal and in phase with the direct component of the power system voltage presented before compensation. The capability of the Series APF is determined by the maximum rate of the apparent power that can be delivered. The challenge now is how these equipments can be dimensioned, this leads to the evaluation of the rate of the apparent power required to achieve this compensations under such conditions. This study present a comparison based on the approaches presented by the definition of the effective apparent power as defined in IEEE 1459-2000, the European school approach and the apparent power classical approach. The two first approaches were proved to be the best methods for the calculation of the apparent power presenting the suitable amount to be concerned in the design process of different devices and allow a good estimation of the Series APF dimensions with low economic burden. This paper presents some application which may be occur in the AC power systems, mainly for three-phase, three-wire AC power systems without neutral wire which can be used for the design process of the Series APF.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134117792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632864
M. Dhawyani, Q. Mahrooqi, F. Rahbi, A. Kalbani, F. Touati, Z. Nadir
The cellular mobile communication industry has recently been one of the fastest growing industries. This paper presents efficient techniques in the design of switching mode class E power amplifiers by reducing switching losses. A typical class E circuit has been design-optimized for 900 and 1800 MHz. Matching networks are used to reduce power consumption. The simulated results were analyzed in terms of output power, dissipated power in the transistor, and efficiency. Efficiencies higher than 67% could be achieved.
{"title":"Improvement in the efficiency of class-E power amplifier for RF","authors":"M. Dhawyani, Q. Mahrooqi, F. Rahbi, A. Kalbani, F. Touati, Z. Nadir","doi":"10.1109/SSD.2008.4632864","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632864","url":null,"abstract":"The cellular mobile communication industry has recently been one of the fastest growing industries. This paper presents efficient techniques in the design of switching mode class E power amplifiers by reducing switching losses. A typical class E circuit has been design-optimized for 900 and 1800 MHz. Matching networks are used to reduce power consumption. The simulated results were analyzed in terms of output power, dissipated power in the transistor, and efficiency. Efficiencies higher than 67% could be achieved.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133318201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632897
H. Osta, R. Qahwaji, S. Ipson
In this paper, we investigate wavelet-based feature extraction from mammogram images and efficient dimensionality reduction techniques. The aim is to propose a new computerized feature extraction technique to identify abnormalities in breast mammogram images. In this work, dimensionality reduction is carried out using the minimal-redundancy-maximal-relevance criterion (mRMR). The classification accuracy for each set of features is measured and evaluated using machine learning techniques and support vector machines (SVMs).
{"title":"Comparisons of feature selection methods using discrete wavelet transforms and Support Vector Machines for mammogram images","authors":"H. Osta, R. Qahwaji, S. Ipson","doi":"10.1109/SSD.2008.4632897","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632897","url":null,"abstract":"In this paper, we investigate wavelet-based feature extraction from mammogram images and efficient dimensionality reduction techniques. The aim is to propose a new computerized feature extraction technique to identify abnormalities in breast mammogram images. In this work, dimensionality reduction is carried out using the minimal-redundancy-maximal-relevance criterion (mRMR). The classification accuracy for each set of features is measured and evaluated using machine learning techniques and support vector machines (SVMs).","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130784044","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632816
S. Chaouch, L. Chrifi, A. Makouf, M. Said
A new backstepping controller is designed for two different speed sensorless induction motor, based on measurements of stator current. As in field-oriented control scheme, the backstepping analysis generates references for magnetizing flux component and for the speed component of the stator current. The control algorithm is proposed for replacing the existing PI controller to obtain high performance motion control systems, for the speed, flux and currents control loops. Also, the control comes along with a through proof derived based Lyapunov stability theory. Open loop estimator and closed loop observer are used for this purpose and compared in term of their robustness against rotor and stator resistances variations. Simulation results are provided to judge the consistency, effectiveness and performances of this control technique.
{"title":"Backstepping control analysis of two different speed sensorless approaches for induction motor","authors":"S. Chaouch, L. Chrifi, A. Makouf, M. Said","doi":"10.1109/SSD.2008.4632816","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632816","url":null,"abstract":"A new backstepping controller is designed for two different speed sensorless induction motor, based on measurements of stator current. As in field-oriented control scheme, the backstepping analysis generates references for magnetizing flux component and for the speed component of the stator current. The control algorithm is proposed for replacing the existing PI controller to obtain high performance motion control systems, for the speed, flux and currents control loops. Also, the control comes along with a through proof derived based Lyapunov stability theory. Open loop estimator and closed loop observer are used for this purpose and compared in term of their robustness against rotor and stator resistances variations. Simulation results are provided to judge the consistency, effectiveness and performances of this control technique.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131007337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632834
M. Rostamzadeh, V. T. Vakily
Multicarrier modulation (MCM) technique is considered as the key element in realizing high-speed wireless and wireline digital communications. However, high peak-to-average power ratio (PAPR) of transmitted signals is a major drawback for multicarrier modulation systems such as orthogonal frequency division multiplexing (OFDM) and wavelet packet division multiplexing (WPDM). This paper investigates the PAPR of WPDM for high-speed digital communications system and uses three methods to reduce peak power of WPDM system. Selected mapping (SLM) technique and partial transmit sequence (PTS) are two methods, employed just in the transmitter side. Also in an other design, WPDM signals are clipped to an acceptable peak level and an equalization method used at receiver to eliminate the effect of clipping. The schemes are compared with simulation results.
{"title":"PAPR reduction in wavelet packet modulation","authors":"M. Rostamzadeh, V. T. Vakily","doi":"10.1109/SSD.2008.4632834","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632834","url":null,"abstract":"Multicarrier modulation (MCM) technique is considered as the key element in realizing high-speed wireless and wireline digital communications. However, high peak-to-average power ratio (PAPR) of transmitted signals is a major drawback for multicarrier modulation systems such as orthogonal frequency division multiplexing (OFDM) and wavelet packet division multiplexing (WPDM). This paper investigates the PAPR of WPDM for high-speed digital communications system and uses three methods to reduce peak power of WPDM system. Selected mapping (SLM) technique and partial transmit sequence (PTS) are two methods, employed just in the transmitter side. Also in an other design, WPDM signals are clipped to an acceptable peak level and an equalization method used at receiver to eliminate the effect of clipping. The schemes are compared with simulation results.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133053479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632829
Mohamed Jallouli, Mohamed Boukattaya, T. Damak
In this paper, we present a dynamic redundancy resolution technique for mobile manipulator subject to joint velocity limits. First, the dynamic model of the mobile manipulator in feasible motion space is given. Next, a control algorithm is proposed which completely decouples the motion of the system into the end-effector motion in the task space and the internal motion in the null space and controls them in prioritized basis with priority given to the primary task space and enables the selection of characteristics in both subspaces separately. A special attention is given to the joints velocity limits avoidance where a normalized measure is proposed to solve problems inherent to velocity limits of the system. Simulation results are given to illustrate the coordination of two subsystems in executing the desired trajectory without violating the joint velocity limits.
{"title":"Dynamic redundancy resolution for mobile manipulators with joints velocity limits avoidance","authors":"Mohamed Jallouli, Mohamed Boukattaya, T. Damak","doi":"10.1109/SSD.2008.4632829","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632829","url":null,"abstract":"In this paper, we present a dynamic redundancy resolution technique for mobile manipulator subject to joint velocity limits. First, the dynamic model of the mobile manipulator in feasible motion space is given. Next, a control algorithm is proposed which completely decouples the motion of the system into the end-effector motion in the task space and the internal motion in the null space and controls them in prioritized basis with priority given to the primary task space and enables the selection of characteristics in both subspaces separately. A special attention is given to the joints velocity limits avoidance where a normalized measure is proposed to solve problems inherent to velocity limits of the system. Simulation results are given to illustrate the coordination of two subsystems in executing the desired trajectory without violating the joint velocity limits.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"497 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116203353","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632877
A. Casanova, M. C. Ramón, L. de Haro y Ariet, P. Blanco-Gonzalez
This paper analyzes the problematic of the interferences created by wind farms. Wind turbines may cause interferences to television and microwave signals due to reflections and diffractions of those signals from both the tower (stationary) and the blades (non-stationary). The ITU Radiocommunication Assembly, on the BT 805, specifies a simplified model of impairment caused to television reception by a single wind turbine considering only free space propagation. This paper shows the extensions to a multiple turbine case, the inclusion of other propagation models (plain earth and ITU-R P.1546) and presents more accurate models to obtain the scattering produced by a wind turbine, as well as their implementation on friendly-use software.
{"title":"Wind farming interference effects","authors":"A. Casanova, M. C. Ramón, L. de Haro y Ariet, P. Blanco-Gonzalez","doi":"10.1109/SSD.2008.4632877","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632877","url":null,"abstract":"This paper analyzes the problematic of the interferences created by wind farms. Wind turbines may cause interferences to television and microwave signals due to reflections and diffractions of those signals from both the tower (stationary) and the blades (non-stationary). The ITU Radiocommunication Assembly, on the BT 805, specifies a simplified model of impairment caused to television reception by a single wind turbine considering only free space propagation. This paper shows the extensions to a multiple turbine case, the inclusion of other propagation models (plain earth and ITU-R P.1546) and presents more accurate models to obtain the scattering produced by a wind turbine, as well as their implementation on friendly-use software.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116547256","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632887
Jawad K. Ali
A novel fractal dual-mode microstrip bandpass filter design has been introduced in an attempt to produce filters with highly miniaturized size for modern wireless applications. The filter structure has been generated based on the 3rd iteration Minkowski-like pre-fractal geometry, using the conventional dual-mode square ring resonator as the initiator in the fractal generation process. The space-filling property, self-similarity and the diagonal symmetry of the structures corresponding to the successive iteration levels of this fractal geometry have found to produce reduced size filter structures with accepted performance. The bandpass filter structure produced by the 3rd iteration of this fractal geometry can be considered as a novel design with adequate performance. This design structure possesses a size reduction of about 72% compared with the conventional dualmode square ring resonator operating at the same frequency and using the same substrate material. In addition, the new design technique seems reliable, since it provides the filter designers with more degree of freedom and further size reduction as compared with those reported in the literatures.
{"title":"A new miniaturized fractal bandpass filter based on dual-mode microstrip square ring resonator","authors":"Jawad K. Ali","doi":"10.1109/SSD.2008.4632887","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632887","url":null,"abstract":"A novel fractal dual-mode microstrip bandpass filter design has been introduced in an attempt to produce filters with highly miniaturized size for modern wireless applications. The filter structure has been generated based on the 3rd iteration Minkowski-like pre-fractal geometry, using the conventional dual-mode square ring resonator as the initiator in the fractal generation process. The space-filling property, self-similarity and the diagonal symmetry of the structures corresponding to the successive iteration levels of this fractal geometry have found to produce reduced size filter structures with accepted performance. The bandpass filter structure produced by the 3rd iteration of this fractal geometry can be considered as a novel design with adequate performance. This design structure possesses a size reduction of about 72% compared with the conventional dualmode square ring resonator operating at the same frequency and using the same substrate material. In addition, the new design technique seems reliable, since it provides the filter designers with more degree of freedom and further size reduction as compared with those reported in the literatures.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121520489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632825
N. Derbel
This work is aimed at looking into the use of fuzzy systems for the study of nonlinear systems. In a first step, zero-order and first-order Sugeno fuzzy models are defined as approximators of nonlinear systems. It has been found that zero-order fuzzy systems are equivalent to the classical interpolation approach. Nonlinear terms have been limited by two fuzzy systems. The mean fuzzy system gives good accuracy. As illustrations, some numerical applications have been considered to show the efficiency of the use of fuzzy systems to study nonlinear problems.
{"title":"A discussion on Sugeno fuzzy logic approximations of nonlinear systems","authors":"N. Derbel","doi":"10.1109/SSD.2008.4632825","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632825","url":null,"abstract":"This work is aimed at looking into the use of fuzzy systems for the study of nonlinear systems. In a first step, zero-order and first-order Sugeno fuzzy models are defined as approximators of nonlinear systems. It has been found that zero-order fuzzy systems are equivalent to the classical interpolation approach. Nonlinear terms have been limited by two fuzzy systems. The mean fuzzy system gives good accuracy. As illustrations, some numerical applications have been considered to show the efficiency of the use of fuzzy systems to study nonlinear problems.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122990192","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-07-20DOI: 10.1109/SSD.2008.4632833
M. Rostamzadeh, V. T. Vakily, M. Moshfegh
High peak-to-average power ratio (PAPR) of transmitted signals is a major drawback for multi-carrier modulation (MCM) systems such as orthogonal frequency division multiplexing (OFDM) and wavelet packet division multiplexing (WPDM). Companding transform is an efficient and simple method to reduce the PAPR for MCM systems. In this paper, a novel adaptive companding transform scheme is proposed to efficaciously reduce the Peak-to-Average Power Ratio of OFDM and WPDM signals. In this technique, only the signals, whose amplitudes are higher than the threshold, are compressed in the transmitter, adaptively. We propose a new formula for the threshold level and send the threshold value to the receiver as side information. Using a simple judgment process, the expanding operation based on the transmitted side information will be executed to the compressed signals in the receiver. Computer simulation results show that the adaptive threshold companding (ATC) scheme effectively improves the performance of PAPR by introducing a simple adaptive threshold judgment process.
{"title":"PAPR reduction in WPDM and OFDM systems using an adaptive threshold companding scheme","authors":"M. Rostamzadeh, V. T. Vakily, M. Moshfegh","doi":"10.1109/SSD.2008.4632833","DOIUrl":"https://doi.org/10.1109/SSD.2008.4632833","url":null,"abstract":"High peak-to-average power ratio (PAPR) of transmitted signals is a major drawback for multi-carrier modulation (MCM) systems such as orthogonal frequency division multiplexing (OFDM) and wavelet packet division multiplexing (WPDM). Companding transform is an efficient and simple method to reduce the PAPR for MCM systems. In this paper, a novel adaptive companding transform scheme is proposed to efficaciously reduce the Peak-to-Average Power Ratio of OFDM and WPDM signals. In this technique, only the signals, whose amplitudes are higher than the threshold, are compressed in the transmitter, adaptively. We propose a new formula for the threshold level and send the threshold value to the receiver as side information. Using a simple judgment process, the expanding operation based on the transmitted side information will be executed to the compressed signals in the receiver. Computer simulation results show that the adaptive threshold companding (ATC) scheme effectively improves the performance of PAPR by introducing a simple adaptive threshold judgment process.","PeriodicalId":267264,"journal":{"name":"2008 5th International Multi-Conference on Systems, Signals and Devices","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124650324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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