Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296241
Hong-Chuan Yang, M. Simon, Mohamed-Slim Alouini
This paper proposes and analyzes an alternative form of switch and examine combining, namely one that waits for a channel coherence time if all the available diversity paths fail to meet a predetermined minimum quality requirement. This scanning through the available diversity paths followed by waiting is repeated indefinitely until a path with an acceptable quality is found. The performance of the resulting "scan and wait" combining (SWC) scheme is studied in terms of its average probability of error and ergodic capacity. The paper looks also into (i) the delay associated with SWC by deriving the statistics of the waiting time needed before satisfactory transmission occurs and (ii) the underlying complexity by studying the statistics of the number of diversity paths estimated per channel access. Selected numerical examples show that, for a fixed average number of channel estimates per channel access, SWC outperforms traditional diversity combining schemes at the expense of a negligible time delay.
{"title":"Scan and wait combining (SWC): a switch and examine strategy with a performance-delay tradeoff","authors":"Hong-Chuan Yang, M. Simon, Mohamed-Slim Alouini","doi":"10.1109/ISCCSP.2004.1296241","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296241","url":null,"abstract":"This paper proposes and analyzes an alternative form of switch and examine combining, namely one that waits for a channel coherence time if all the available diversity paths fail to meet a predetermined minimum quality requirement. This scanning through the available diversity paths followed by waiting is repeated indefinitely until a path with an acceptable quality is found. The performance of the resulting \"scan and wait\" combining (SWC) scheme is studied in terms of its average probability of error and ergodic capacity. The paper looks also into (i) the delay associated with SWC by deriving the statistics of the waiting time needed before satisfactory transmission occurs and (ii) the underlying complexity by studying the statistics of the number of diversity paths estimated per channel access. Selected numerical examples show that, for a fixed average number of channel estimates per channel access, SWC outperforms traditional diversity combining schemes at the expense of a negligible time delay.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"80 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123228950","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296270
B. Khaddoumi, Olivier Meste, Hervé Rix
The spatial distribution of the cardiac electric activity, recorded on the surface of the body is more and more investigated in medicine. Indeed it provides us a global view of the electrophysiological phenomena occurring in the heart. In this paper we use a 64 channel ECG recordings to analyse the variability of the T-wave shape. To perform this task new methods of comparison are applied, the distribution function method (DFM) and the integrated shape averaging (ISA). The latest takes into account the definition of shape equality where signals are related by time scaling factors and delays. The main property of this method is to produce an "average signal" which respects the shape equality principle. The given approach shows their capabilities, when analysing electrophysiological signals, on the application described above.
{"title":"Spatial variability analysis of ECG mapping: a shape approach","authors":"B. Khaddoumi, Olivier Meste, Hervé Rix","doi":"10.1109/ISCCSP.2004.1296270","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296270","url":null,"abstract":"The spatial distribution of the cardiac electric activity, recorded on the surface of the body is more and more investigated in medicine. Indeed it provides us a global view of the electrophysiological phenomena occurring in the heart. In this paper we use a 64 channel ECG recordings to analyse the variability of the T-wave shape. To perform this task new methods of comparison are applied, the distribution function method (DFM) and the integrated shape averaging (ISA). The latest takes into account the definition of shape equality where signals are related by time scaling factors and delays. The main property of this method is to produce an \"average signal\" which respects the shape equality principle. The given approach shows their capabilities, when analysing electrophysiological signals, on the application described above.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"55 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123404271","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296278
G. Lemineur, R. Harba, R. Jennane, A. Estrade, L. Benhamou
This communication presents a method to estimate the fractal anisotropy. This method consists in estimating the H(/spl theta/) parameter of an anisotropic fractional Brownian field depending on the direction /spl theta/. We have tested this method on synthetic isotropic and anisotropic images. Results are of good quality. Then, it was applied to bone radiographic images described by their anisotropy, non stationary, and textured character. 109 images (70 controls and 39 osteoporosis cases) were examined. Results show the efficiency of the method to discriminate the two populations. Moreover they show that the structural organization of bone is more anisotropic for the osteoporotic cases than for control cases in accordance with the natural evolution of bone tissue linked to osteoporosis.
{"title":"Fractal anisotropy measurement of bone texture radiographs","authors":"G. Lemineur, R. Harba, R. Jennane, A. Estrade, L. Benhamou","doi":"10.1109/ISCCSP.2004.1296278","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296278","url":null,"abstract":"This communication presents a method to estimate the fractal anisotropy. This method consists in estimating the H(/spl theta/) parameter of an anisotropic fractional Brownian field depending on the direction /spl theta/. We have tested this method on synthetic isotropic and anisotropic images. Results are of good quality. Then, it was applied to bone radiographic images described by their anisotropy, non stationary, and textured character. 109 images (70 controls and 39 osteoporosis cases) were examined. Results show the efficiency of the method to discriminate the two populations. Moreover they show that the structural organization of bone is more anisotropic for the osteoporotic cases than for control cases in accordance with the natural evolution of bone tissue linked to osteoporosis.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128834090","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296233
J. Sfeir, H. Kanaan, M. Saad
In this paper, we present a unified approach in path generation for a mobile robot. We use a memory neuron network to control a mobile robot along a trajectory while avoiding obstacles. We briefly show the robot's features in order to introduce the neural network used to control it. Some simulation results are discussed.
{"title":"Mobile robots path generation using memory neuron networks","authors":"J. Sfeir, H. Kanaan, M. Saad","doi":"10.1109/ISCCSP.2004.1296233","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296233","url":null,"abstract":"In this paper, we present a unified approach in path generation for a mobile robot. We use a memory neuron network to control a mobile robot along a trajectory while avoiding obstacles. We briefly show the robot's features in order to introduce the neural network used to control it. Some simulation results are discussed.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128285545","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296236
N. Maghraoui, S. Belghith
The Rossler chaotic systems are synchronized using adaptive backstepping with modular design, despite the differences between characterizing parameters and initial conditions. Hence global stability and asymptotic synchronization between the outputs of master and slave systems can be achieved. The effectiveness of the approach is shown by simulation results.
{"title":"Synchronization of two Rossler chaotic systems via adaptive backstepping with modular design","authors":"N. Maghraoui, S. Belghith","doi":"10.1109/ISCCSP.2004.1296236","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296236","url":null,"abstract":"The Rossler chaotic systems are synchronized using adaptive backstepping with modular design, despite the differences between characterizing parameters and initial conditions. Hence global stability and asymptotic synchronization between the outputs of master and slave systems can be achieved. The effectiveness of the approach is shown by simulation results.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130011975","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296235
O. Boubaker
The decoupling problem of non linear systems with input multiplicities is investigated. A new non-standard form that describes such dynamic behaviors is introduced. A decoupling strategy that permits to reach regulation objectives in spite of multiplicity interactions is given. Stability is proved and a systematic design of decoupled controllers is derived for systems with non unstable zero dynamics.
{"title":"Decoupling and synthesis of non linear systems with input multiplicities","authors":"O. Boubaker","doi":"10.1109/ISCCSP.2004.1296235","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296235","url":null,"abstract":"The decoupling problem of non linear systems with input multiplicities is investigated. A new non-standard form that describes such dynamic behaviors is introduced. A decoupling strategy that permits to reach regulation objectives in spite of multiplicity interactions is given. Stability is proved and a systematic design of decoupled controllers is derived for systems with non unstable zero dynamics.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"176 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121040459","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296299
K. Letaief
Summary form only given. The wireless communication landscape continues to experience dramatic changes due to the emergence of new systems driven by the rapid growth in information services provided by the Internet and the appearance of new multimedia applications. These growing trends point towards huge market potential for universal high-speed wireless data access. To make this possible, continues technology evolution to provide higher and higher data rates for wireless communications is a necessity. Unfortunately, the road to wireless ubiquity remains covered with potholes and challenges. In particular, a number of competing wireless systems are at an important crossroad. For example, the evolution of cellular systems to 3G versus the emergence of short-range wireless systems such as Wi-Fi and possible longer range wider-fi networks. This talk examines the opportunities and challenges facing truly ubiquitous wireless services and examine the various competing technologies. We also consider 3G systems and introduce some of the leading technological advances that enable broadband and high-speed data capabilities in the next-generation wireless networks.
{"title":"Wireless communications at a crossroads","authors":"K. Letaief","doi":"10.1109/ISCCSP.2004.1296299","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296299","url":null,"abstract":"Summary form only given. The wireless communication landscape continues to experience dramatic changes due to the emergence of new systems driven by the rapid growth in information services provided by the Internet and the appearance of new multimedia applications. These growing trends point towards huge market potential for universal high-speed wireless data access. To make this possible, continues technology evolution to provide higher and higher data rates for wireless communications is a necessity. Unfortunately, the road to wireless ubiquity remains covered with potholes and challenges. In particular, a number of competing wireless systems are at an important crossroad. For example, the evolution of cellular systems to 3G versus the emergence of short-range wireless systems such as Wi-Fi and possible longer range wider-fi networks. This talk examines the opportunities and challenges facing truly ubiquitous wireless services and examine the various competing technologies. We also consider 3G systems and introduce some of the leading technological advances that enable broadband and high-speed data capabilities in the next-generation wireless networks.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126656421","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296221
M. Valkama, M. Renfors
The evolution of wireless communications receivers from the traditional superheterodyne architecture to more advanced structures with better integrability is largely based on the concept of complex or I/Q signals. In this paper, we discuss the role of I/Q signal processing in different receivers, with emphasis on I/Q imbalance effects. Also the use of adaptive DSP algorithms for I/Q imbalance compensation in different receiver structures is analyzed, and some measurement-based results concerning the performance of these techniques with practical analog front-ends are presented.
{"title":"Advanced receiver architectures and I/Q signal processing","authors":"M. Valkama, M. Renfors","doi":"10.1109/ISCCSP.2004.1296221","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296221","url":null,"abstract":"The evolution of wireless communications receivers from the traditional superheterodyne architecture to more advanced structures with better integrability is largely based on the concept of complex or I/Q signals. In this paper, we discuss the role of I/Q signal processing in different receivers, with emphasis on I/Q imbalance effects. Also the use of adaptive DSP algorithms for I/Q imbalance compensation in different receiver structures is analyzed, and some measurement-based results concerning the performance of these techniques with practical analog front-ends are presented.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126245736","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296204
Antonio Pedro Aguiar, J. Hespanha
In this paper, the author proposes a solution to the position tracking problem for fairly general class of underactuated autonomous vehicles that is applicable to motion in either two or three dimensional spaces. The tracking controller proposed yields global stability and exponential convergence of the position tracking error to a neighborhood of the origin that can be made arbitrarily small. The desired trajectory does not need to be a trimming trajectory and can be sufficiently smooth time-varying bounded curve, including the degenerate case of a constant trajectory (set-point). The control algorithm builds on iterative Lyapunov-based techniques, in particular, integrator backstepping. This is an important issue since the availability of a Lyapunov function suits the need of robust control designs in the presence of noise measurements, handed disturbances, and unmeasured thruster dynamics.
{"title":"Supervisory control of uncertain underactuated vehicles","authors":"Antonio Pedro Aguiar, J. Hespanha","doi":"10.1109/ISCCSP.2004.1296204","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296204","url":null,"abstract":"In this paper, the author proposes a solution to the position tracking problem for fairly general class of underactuated autonomous vehicles that is applicable to motion in either two or three dimensional spaces. The tracking controller proposed yields global stability and exponential convergence of the position tracking error to a neighborhood of the origin that can be made arbitrarily small. The desired trajectory does not need to be a trimming trajectory and can be sufficiently smooth time-varying bounded curve, including the degenerate case of a constant trajectory (set-point). The control algorithm builds on iterative Lyapunov-based techniques, in particular, integrator backstepping. This is an important issue since the availability of a Lyapunov function suits the need of robust control designs in the presence of noise measurements, handed disturbances, and unmeasured thruster dynamics.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126669680","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 : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296265
Gokhan Bora, L. Onural
Scalar optical diffraction between arbitrarily oriented planes for monochromatic waves is analyzed and a simulator based on a discrete model is developed. The model is based directly on the Rayleigh-Sommerfeld diffraction integral; there is no need for Fresnel and Fraunhofer approximations. Furthermore, the model permits to use of the FFT algorithm. The simulator results are satisfactory.
{"title":"Simulation of scalar optical diffraction between arbitrarily oriented planes","authors":"Gokhan Bora, L. Onural","doi":"10.1109/ISCCSP.2004.1296265","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296265","url":null,"abstract":"Scalar optical diffraction between arbitrarily oriented planes for monochromatic waves is analyzed and a simulator based on a discrete model is developed. The model is based directly on the Rayleigh-Sommerfeld diffraction integral; there is no need for Fresnel and Fraunhofer approximations. Furthermore, the model permits to use of the FFT algorithm. The simulator results are satisfactory.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128251487","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：