Pub Date : 2004-09-27DOI: 10.1109/ISCCSP.2004.1296301
L. Grieco, S. Mascolo
This paper has focused on two rate-based congestion control algorithms, namely TCP-friendly rate control (TFRC) and the adaptive rate control (ARC), for streaming flows over the Internet. After a brief description of the two algorithms, computer simulations using ns-2 have been reported to investigate intra-protocol fairness, inter-protocol friendliness and efficiency. The main results are given: (1) ARC is friendly towards Reno TCP whereas TFRC is not; (2) ARC increases fairness; (3) ARC remarkably improves the goodput with respect to TFRC and Reno TCP in the presence of wireless lossy links.
{"title":"Efficiency, fairness and friendliness evaluation of TFRC and ARC rate-based congestion control","authors":"L. Grieco, S. Mascolo","doi":"10.1109/ISCCSP.2004.1296301","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296301","url":null,"abstract":"This paper has focused on two rate-based congestion control algorithms, namely TCP-friendly rate control (TFRC) and the adaptive rate control (ARC), for streaming flows over the Internet. After a brief description of the two algorithms, computer simulations using ns-2 have been reported to investigate intra-protocol fairness, inter-protocol friendliness and efficiency. The main results are given: (1) ARC is friendly towards Reno TCP whereas TFRC is not; (2) ARC increases fairness; (3) ARC remarkably improves the goodput with respect to TFRC and Reno TCP in the presence of wireless lossy links.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"35 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":"131043729","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.2004.1296296
F. Benmeddour, F. Benabdelaziz, Farid Bouttout, N. Aouabdia
Closed-form expressions for two kinds of Hankel transform integrals, which are encountered in the spectral moment method solution of a circular patch, are obtained. Application of the newly obtained formulas alleviates dramatically the algebraic work for determining the Hankel transforms of the current basis functions involving Chebyshev polynomials and edge condition. Computed moment method results using these expressions are presented. The effects of both uniaxial anisotropy in the substrate on the resonant frequency and bandwidth are investigated.
{"title":"Resonance characteristics of circular microstrip antennas using moment method and various current representations","authors":"F. Benmeddour, F. Benabdelaziz, Farid Bouttout, N. Aouabdia","doi":"10.1109/ISCCSP.2004.1296296","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296296","url":null,"abstract":"Closed-form expressions for two kinds of Hankel transform integrals, which are encountered in the spectral moment method solution of a circular patch, are obtained. Application of the newly obtained formulas alleviates dramatically the algebraic work for determining the Hankel transforms of the current basis functions involving Chebyshev polynomials and edge condition. Computed moment method results using these expressions are presented. The effects of both uniaxial anisotropy in the substrate on the resonant frequency and bandwidth are investigated.","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":"130745031","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.2004.1296473
R. Latif, E. Aassif, A. Moudden, B. Faiz
In this article, the time-frequency representation, that takes into account both the time parameter and the frequency parameter of a signal, is used to analyse the acoustic signal backscattered by a thin elastic tube. The non parametric representation "Wigner-Ville distribution" and the parametric representation "modified version" are used in this study for their interesting properties. These representations are applied to the analysis of the dispersion of symmetric S0 and antisymmetric A1 circumferential waves propagating around a tube with a radii ratio equal to 0.95. The image obtained by Wigner-Ville distribution is compared with the modified Wigner-Ville image. From these time-frequency images, we have estimated the group velocity with a high precision. These velocities are compared with those computed by the proper mode theory given in the scientific literature. A good agreement is obtained.
{"title":"Acoustic signals analysed by a parametric and non parametric time-frequency representations","authors":"R. Latif, E. Aassif, A. Moudden, B. Faiz","doi":"10.1109/ISCCSP.2004.1296473","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296473","url":null,"abstract":"In this article, the time-frequency representation, that takes into account both the time parameter and the frequency parameter of a signal, is used to analyse the acoustic signal backscattered by a thin elastic tube. The non parametric representation \"Wigner-Ville distribution\" and the parametric representation \"modified version\" are used in this study for their interesting properties. These representations are applied to the analysis of the dispersion of symmetric S0 and antisymmetric A1 circumferential waves propagating around a tube with a radii ratio equal to 0.95. The image obtained by Wigner-Ville distribution is compared with the modified Wigner-Ville image. From these time-frequency images, we have estimated the group velocity with a high precision. These velocities are compared with those computed by the proper mode theory given in the scientific literature. A good agreement is obtained.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"9 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":"132082755","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.2004.1296489
M. Hasna
This paper proposes a modified two-hop wireless communication system and studies its performance. The modified system has a reliable feedback channel that carries a binary signal from the receiver to inform the transmitter about the current state of the channel, and hence affects transmission decision. In the analysis, both regenerative and nonregenerative systems are considered. Outage probability, which is the probability of having the link quality below a certain threshold is used as the performance assessment tool. Numerical results show that binary feedback greatly improves the performance of two-hop systems, specially when the transmission threshold is set close to the outage threshold. They also show that non-regenerative systems with binary feedback can outperform regenerative systems without any feedback.
{"title":"Performance enhancement of relay-assisted communications via binary feedback","authors":"M. Hasna","doi":"10.1109/ISCCSP.2004.1296489","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296489","url":null,"abstract":"This paper proposes a modified two-hop wireless communication system and studies its performance. The modified system has a reliable feedback channel that carries a binary signal from the receiver to inform the transmitter about the current state of the channel, and hence affects transmission decision. In the analysis, both regenerative and nonregenerative systems are considered. Outage probability, which is the probability of having the link quality below a certain threshold is used as the performance assessment tool. Numerical results show that binary feedback greatly improves the performance of two-hop systems, specially when the transmission threshold is set close to the outage threshold. They also show that non-regenerative systems with binary feedback can outperform regenerative systems without any feedback.","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":"127853600","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.2004.1296268
S. Omran, M. Tayel
A heart sound segmentation and feature extraction algorithm, which separates the heart sound signal into four parts: the first heart sound S1, the systolic period, the second heart sound S2, and the diastolic period. A features extraction algorithm has been developed. The algorithm uses discrete wavelet decomposition and reconstruction to produce approximations and details of the original phonocardiographic signal.
{"title":"A heart sound segmentation and feature extraction algorithm using wavelets","authors":"S. Omran, M. Tayel","doi":"10.1109/ISCCSP.2004.1296268","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296268","url":null,"abstract":"A heart sound segmentation and feature extraction algorithm, which separates the heart sound signal into four parts: the first heart sound S1, the systolic period, the second heart sound S2, and the diastolic period. A features extraction algorithm has been developed. The algorithm uses discrete wavelet decomposition and reconstruction to produce approximations and details of the original phonocardiographic signal.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"19 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":"129214256","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.2004.1296463
E. B. Bilcu, J. Astola, J. Saarinen
Among many neural network architectures that exist in the literature, the recurrent neural networks (RNN's) are of special interest due to their ability to deal with spatial temporal problems. However, in an earlier published paper, the authors shown that RNN's have poor performance in terms of phoneme accuracy when applied to the specific problem of converting text streams into their phonetic transcriptions. This is due to the fact that RNN's contains a weak left side context dependence between letters and the right side context dependence is not included. In this paper, we study the behavior of RNN that includes the context information between adjacent letters at the input. The results in terms of phoneme accuracy, for the RNN with both side input context dependence, multilayer perception and RNN, in the context of text-to-phoneme mapping, are shown.
{"title":"Recurrent neural network with both side input context dependence for text-to-phoneme mapping","authors":"E. B. Bilcu, J. Astola, J. Saarinen","doi":"10.1109/ISCCSP.2004.1296463","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296463","url":null,"abstract":"Among many neural network architectures that exist in the literature, the recurrent neural networks (RNN's) are of special interest due to their ability to deal with spatial temporal problems. However, in an earlier published paper, the authors shown that RNN's have poor performance in terms of phoneme accuracy when applied to the specific problem of converting text streams into their phonetic transcriptions. This is due to the fact that RNN's contains a weak left side context dependence between letters and the right side context dependence is not included. In this paper, we study the behavior of RNN that includes the context information between adjacent letters at the input. The results in terms of phoneme accuracy, for the RNN with both side input context dependence, multilayer perception and RNN, in the context of text-to-phoneme mapping, are shown.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"32 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":"126654609","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.2004.1296340
J. Rabadán, M. A. Bacallado, F. Delgado, S. Perez, R. Pérez-Jiménez
In this paper, the design and experimental testing of a direct-sequence spread spectrum (DSSS) system for wireless indoor infrared network is presented. This method improves the wireless IR communications performances against multipath propagation and narrowband interference. We have implemented an IR-DSSS prototype with 100 MHz code frequency and about 6 Mbps bit rate. We also present some results on a simplified synchronization structure so as to be used on reduced-cost domestic equipment. These systems are suitable for different applications at low and medium rates, especially for in-house communications between domestic appliances.
{"title":"Experimental characterization of a direct-sequence spread-spectrum optical wireless system for in-house communications","authors":"J. Rabadán, M. A. Bacallado, F. Delgado, S. Perez, R. Pérez-Jiménez","doi":"10.1109/ISCCSP.2004.1296340","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296340","url":null,"abstract":"In this paper, the design and experimental testing of a direct-sequence spread spectrum (DSSS) system for wireless indoor infrared network is presented. This method improves the wireless IR communications performances against multipath propagation and narrowband interference. We have implemented an IR-DSSS prototype with 100 MHz code frequency and about 6 Mbps bit rate. We also present some results on a simplified synchronization structure so as to be used on reduced-cost domestic equipment. These systems are suitable for different applications at low and medium rates, especially for in-house communications between domestic appliances.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"225 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":"121126031","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.2004.1296303
L. Gatani, G. Lo Re, A. Urso
This paper proposes two distributed algorithms for the heuristic solution of the Steiner tree problem in networks (SPN). The problem has a practical application in the construction of a minimum cost distribution tree for multicast transmission. Multicast transmission represents a necessary lower network service for the wide diffusion of new multimedia network applications. Currently, given the lack of efficient distributed methods, the existing protocols build the multicast distribution tree using some selected central node. The proposed distributed algorithms allow the construction of effective distribution trees using a coordination protocol among the network nodes. The algorithms have been implemented and tested both in simulation and on real networks, and their performance values are presented.
{"title":"Distributed algorithms for multicast tree construction","authors":"L. Gatani, G. Lo Re, A. Urso","doi":"10.1109/ISCCSP.2004.1296303","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296303","url":null,"abstract":"This paper proposes two distributed algorithms for the heuristic solution of the Steiner tree problem in networks (SPN). The problem has a practical application in the construction of a minimum cost distribution tree for multicast transmission. Multicast transmission represents a necessary lower network service for the wide diffusion of new multimedia network applications. Currently, given the lack of efficient distributed methods, the existing protocols build the multicast distribution tree using some selected central node. The proposed distributed algorithms allow the construction of effective distribution trees using a coordination protocol among the network nodes. The algorithms have been implemented and tested both in simulation and on real networks, and their performance values are presented.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"3 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":"116134397","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.2004.1296313
N. Hayasaka, N. Wada, S. Yoshizawa, Y. Miyanaga
This report introduces a new approach of FRM technique for a robust speech recognition system. We have already developed intelligent filtering techniques for robust speech recognition. In this method, a conventional FIR band-pass filter is applied on speech running power spectrum. In order to improve recognition accuracy, the designed FIR filter becomes high order considerably. Using a FRM filter, we can develop a new robust speech recognition whose recognition ability is high enough and whose filtering order can be reduced. Using this new FRM filter, some speech recognition experiments are shown in this report.
{"title":"A robust speech recognition system using FRM running spectrum filtering","authors":"N. Hayasaka, N. Wada, S. Yoshizawa, Y. Miyanaga","doi":"10.1109/ISCCSP.2004.1296313","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296313","url":null,"abstract":"This report introduces a new approach of FRM technique for a robust speech recognition system. We have already developed intelligent filtering techniques for robust speech recognition. In this method, a conventional FIR band-pass filter is applied on speech running power spectrum. In order to improve recognition accuracy, the designed FIR filter becomes high order considerably. Using a FRM filter, we can develop a new robust speech recognition whose recognition ability is high enough and whose filtering order can be reduced. Using this new FRM filter, some speech recognition experiments are shown in this report.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"11 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":"121671799","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.2004.1296305
D. Bauso, L. Giarré, G. Neglia
In this paper, we show that the active queue management (AQM) controllers, usually configured on a single bottleneck basis, may not prevent instability in the presence of multiple bottlenecks. We justify this result through a multiple bottleneck model.
{"title":"Active queue management stability in multiple bottleneck networks","authors":"D. Bauso, L. Giarré, G. Neglia","doi":"10.1109/ISCCSP.2004.1296305","DOIUrl":"https://doi.org/10.1109/ISCCSP.2004.1296305","url":null,"abstract":"In this paper, we show that the active queue management (AQM) controllers, usually configured on a single bottleneck basis, may not prevent instability in the presence of multiple bottlenecks. We justify this result through a multiple bottleneck model.","PeriodicalId":146713,"journal":{"name":"First International Symposium on Control, Communications and Signal Processing, 2004.","volume":"127 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":"122790764","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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