Pub Date : 2010-06-27DOI: 10.1109/SSD.2010.5585534
Ahmed J. Jameel
Orthogonal Frequency Division Multiplexing is a powerful technique employed in wireless systems suffering from frequency selectivity. The adaptive modulation is a powerful technique for maximizing the data throughput of subcarriers allocated to a user. In this paper, we consider a simple adaptive loading algorithm for Orthogonal Frequency Division Multiplexing based wireless communication systems for signal spectrum optimization. The algorithm is based on the margin adaptive loading criterion and its performance over 5 GHz indoor wireless channels. Simulation results show a 6 dB improvement for BER of 10−2 over fixed modulation.
{"title":"Performance enhancement of wireless communication systems using loading algorithm","authors":"Ahmed J. Jameel","doi":"10.1109/SSD.2010.5585534","DOIUrl":"https://doi.org/10.1109/SSD.2010.5585534","url":null,"abstract":"Orthogonal Frequency Division Multiplexing is a powerful technique employed in wireless systems suffering from frequency selectivity. The adaptive modulation is a powerful technique for maximizing the data throughput of subcarriers allocated to a user. In this paper, we consider a simple adaptive loading algorithm for Orthogonal Frequency Division Multiplexing based wireless communication systems for signal spectrum optimization. The algorithm is based on the margin adaptive loading criterion and its performance over 5 GHz indoor wireless channels. Simulation results show a 6 dB improvement for BER of 10−2 over fixed modulation.","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127651106","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 : 2010-06-27DOI: 10.1109/SSD.2010.5585541
S. Saadi, A. Kouzou, A. Guessoum, M. Bettayeb
We want to implement a new optimal approach for image restoration problem, which is useful for neutron radiography images enhancement to assist the physician interpreter on his evaluation. Our approach is based on using swarm intelligence optimization algorithms to solve a least squares minimization ill-posed problem, using Bacterial Foraging Optimization (BFO) Algorithm. To get smoothed images in presence of noise, a Laplacian constraint is introduced for regularization purpose.
{"title":"Bacterial Foraging Algorithm for neutron radiography image quality improvement","authors":"S. Saadi, A. Kouzou, A. Guessoum, M. Bettayeb","doi":"10.1109/SSD.2010.5585541","DOIUrl":"https://doi.org/10.1109/SSD.2010.5585541","url":null,"abstract":"We want to implement a new optimal approach for image restoration problem, which is useful for neutron radiography images enhancement to assist the physician interpreter on his evaluation. Our approach is based on using swarm intelligence optimization algorithms to solve a least squares minimization ill-posed problem, using Bacterial Foraging Optimization (BFO) Algorithm. To get smoothed images in presence of noise, a Laplacian constraint is introduced for regularization purpose.","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"101 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132376148","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 : 2010-06-27DOI: 10.1109/SSD.2010.5585527
A. El-Mousa, Ashraf Suyyagh
Ad Hoc networks lack a fixed infrastructure or centralized administration and are characterized by a highly dynamic topology, though these characteristics are appealing for use in many application domains, they also expose serious vulnerabilities which might be exploited to compromise one or several nodes of the network and possibly affecting overall performance. This introduces the challenge of offering a complete security solution that is effective, scalable and resource friendly. Such a solution should encompass the three components of prevention, detection and reaction. This paper aims to examine the vulnerabilities of Ad Hoc networks, the types of attacks expected and to discuss proactive and reactive techniques which deter such attacks, detect infiltrations and react against them.
Ad Hoc网络缺乏固定的基础设施或集中管理，其特点是高度动态的拓扑结构，尽管这些特征在许多应用程序领域都很有吸引力，但它们也暴露了严重的漏洞，这些漏洞可能被利用来破坏网络的一个或多个节点，并可能影响整体性能。这就带来了提供一个有效、可扩展且资源友好的完整安全解决方案的挑战。这种解决办法应包括预防、检测和反应这三个组成部分。本文旨在研究Ad Hoc网络的漏洞，预期的攻击类型，并讨论阻止此类攻击，检测渗透并对其做出反应的主动和被动技术。
{"title":"Ad Hoc networks security challenges","authors":"A. El-Mousa, Ashraf Suyyagh","doi":"10.1109/SSD.2010.5585527","DOIUrl":"https://doi.org/10.1109/SSD.2010.5585527","url":null,"abstract":"Ad Hoc networks lack a fixed infrastructure or centralized administration and are characterized by a highly dynamic topology, though these characteristics are appealing for use in many application domains, they also expose serious vulnerabilities which might be exploited to compromise one or several nodes of the network and possibly affecting overall performance. This introduces the challenge of offering a complete security solution that is effective, scalable and resource friendly. Such a solution should encompass the three components of prevention, detection and reaction. This paper aims to examine the vulnerabilities of Ad Hoc networks, the types of attacks expected and to discuss proactive and reactive techniques which deter such attacks, detect infiltrations and react against them.","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128576646","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 : 2010-06-27DOI: 10.1109/SSD.2010.5585599
M. Taktak-Meziou, J. Ghommam, N. Derbel
In this paper, an adaptive backstepping method is used for a ship course tracking control. This has been done by applying a reference signal derived from a LOS algorithm. The ship model is described by a third order nonlinear model whose parameters are unknown. The control design uses estimate values of the unknown parameters of the system. Then, adaptive laws of the estimation of these values have been proposed. The stability of the controlled system has been ensured by the use of a Lyapunov function. Simulation results show the effectiveness of the proposed approach and the designed controller can be used to the ship course tracking with good performances.
{"title":"Robust adaptive path following for a nonlinear third order Nomoto's ship model","authors":"M. Taktak-Meziou, J. Ghommam, N. Derbel","doi":"10.1109/SSD.2010.5585599","DOIUrl":"https://doi.org/10.1109/SSD.2010.5585599","url":null,"abstract":"In this paper, an adaptive backstepping method is used for a ship course tracking control. This has been done by applying a reference signal derived from a LOS algorithm. The ship model is described by a third order nonlinear model whose parameters are unknown. The control design uses estimate values of the unknown parameters of the system. Then, adaptive laws of the estimation of these values have been proposed. The stability of the controlled system has been ensured by the use of a Lyapunov function. Simulation results show the effectiveness of the proposed approach and the designed controller can be used to the ship course tracking with good performances.","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126502900","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 : 2010-06-27DOI: 10.1109/SSD.2010.5585561
K. K. Mohammed, Rund B. Mohammed
Class AB power amplifiers are widely used in modern wireless communication systems. However, their non-linearity and high efficiency present a limitation to the performance of these systems. In this paper, we present one Cartesian feedback technique for linearizing AB power amplifier. We first demonstrate the analytical analysis of the proposed scheme, and then we validate the proposed technique using computer simulations. The amplifier parametric model used here takes into account actual operating characteristics of a real commercial unit used for multi carrier transmission.
{"title":"Linearization of power amplifier class AB using Cartesian feedback","authors":"K. K. Mohammed, Rund B. Mohammed","doi":"10.1109/SSD.2010.5585561","DOIUrl":"https://doi.org/10.1109/SSD.2010.5585561","url":null,"abstract":"Class AB power amplifiers are widely used in modern wireless communication systems. However, their non-linearity and high efficiency present a limitation to the performance of these systems. In this paper, we present one Cartesian feedback technique for linearizing AB power amplifier. We first demonstrate the analytical analysis of the proposed scheme, and then we validate the proposed technique using computer simulations. The amplifier parametric model used here takes into account actual operating characteristics of a real commercial unit used for multi carrier transmission.","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129577832","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 : 1900-01-01DOI: 10.1109/peoco.2010.5559173
A. E. El Dein
The paper presents an efficient way to mitigate the magnetic field resulting from the three-phase 500kV single circuit high voltage transmission line existing in Egypt, by using a passive loop conductor in order to reduce the right-of-way (ROW). The paper used an accurate method for the evaluation of 50Hz magnetic field produced by overhead transmission lines. This method is based on the matrix formalism of multiconductor transmission lines (MTL). This method obtained a correct evaluation of all the currents flowing in the MTL structure, including the currents in the subconductors of each phase bundle, the currents in the ground wires, the currents in the mitigation loop, and also the earth return currents. Furthermore, the analysis also incorporates the effect of the conductor's sag between towers, and the effect of sag variation with the temperature on the calculated magnetic field. Good results have been obtained and passive loop conductor design parameters have been recommended for this system at ambient temperature (35°C).
{"title":"Mitigation of magnetic field under Egyptian 500kV overhead transmission line","authors":"A. E. El Dein","doi":"10.1109/peoco.2010.5559173","DOIUrl":"https://doi.org/10.1109/peoco.2010.5559173","url":null,"abstract":"The paper presents an efficient way to mitigate the magnetic field resulting from the three-phase 500kV single circuit high voltage transmission line existing in Egypt, by using a passive loop conductor in order to reduce the right-of-way (ROW). The paper used an accurate method for the evaluation of 50Hz magnetic field produced by overhead transmission lines. This method is based on the matrix formalism of multiconductor transmission lines (MTL). This method obtained a correct evaluation of all the currents flowing in the MTL structure, including the currents in the subconductors of each phase bundle, the currents in the ground wires, the currents in the mitigation loop, and also the earth return currents. Furthermore, the analysis also incorporates the effect of the conductor's sag between towers, and the effect of sag variation with the temperature on the calculated magnetic field. Good results have been obtained and passive loop conductor design parameters have been recommended for this system at ambient temperature (35°C).","PeriodicalId":432382,"journal":{"name":"2010 7th International Multi- Conference on Systems, Signals and Devices","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121820726","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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