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2006 International Telecommunications Symposium最新文献

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Real-time video based finger spelling recognition system using low computational complexity Artificial Neural Networks 基于实时视频的低计算复杂度人工神经网络手指拼写识别系统
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433305
T. Bragatto, G. Ruas, M. V. Lamar
{"title":"Real-time video based finger spelling recognition system using low computational complexity Artificial Neural Networks","authors":"T. Bragatto, G. Ruas, M. V. Lamar","doi":"10.1109/ITS.2006.4433305","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433305","url":null,"abstract":"The automatic sign language translation still is the most complex and challenging task for video recognition and processing. This work presents the Brazilian Sign Language Automatic Translation project and specifically focuses on low complexity Artificial Neural Networks dedicated to real-time video processing. A new approach for reducing the computational complexity of the activation function of the Multi-Layer Perceptron is proposed in this work, allowing complex processing of video signals be done in real-time. The low complexity neural networks are used in two stages of the system. In the color detection and hand posture classification blocks. The obtained results indicate an increase of the frame rate from 8.6 fps to 28.1 fps using a personal microcomputer with a USB webcam, without reduction of the correct recognition rate.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128852933","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}
引用次数: 20
performance of energy efficient game theoretical-based power control algorithm in a discrete power environment 离散功率环境下基于节能博弈理论的功率控制算法的性能研究
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433291
F. Chaves, R.B. Santos, F. Cavalcanti, R.A. de Oliveira Neto
{"title":"performance of energy efficient game theoretical-based power control algorithm in a discrete power environment","authors":"F. Chaves, R.B. Santos, F. Cavalcanti, R.A. de Oliveira Neto","doi":"10.1109/ITS.2006.4433291","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433291","url":null,"abstract":"Transmitter power control is an essential tool for managing the interference in a system constituted by a set of communications nodes. In the absence of a central controller, the decentralized power control is of special interest and may be characterized as a competition among the communication nodes. This indicates the adequacy of the application of noncooperative game theory concepts to the problem. The continuous domain for transmit power is usually assumed, although, in practice, digitally power controlled systems work with discrete power levels. In this work we evaluate the performance of a distributed power control algorithm which is derived from the formulation of the power control problem as a static multi-stage nonzero- sum noncooperative game. Continuous and discrete domains for transmit power are considered.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129843367","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}
引用次数: 0
New trigonometric transforms over prime finite fields for image filtering 基于素数有限域的图像滤波新三角变换
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433235
J. Bandeira, R.M.C. de Souza
{"title":"New trigonometric transforms over prime finite fields for image filtering","authors":"J. Bandeira, R.M.C. de Souza","doi":"10.1109/ITS.2006.4433235","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433235","url":null,"abstract":"This paper introduces a complete family of trigonometric transforms over prime finite fields (FFTTs). Eight cosine transforms and eight sine transforms are defined, denoted FFCT and FFST, respectively. The property of symmetric convolution for these new tools is introduced. It is shown that the use of this operation, together with the development of fast algorithms, allows efficient computation of linear convolutions via FFTTs. A discussion concerning application of these transforms in the field of digital image processing is presented.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126292794","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}
引用次数: 7
A Statistical model for the warp matrix in super-resolution video reconstruction 超分辨率视频重建中翘曲矩阵的统计模型
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433384
G. H. Costa, J. Bermudez
{"title":"A Statistical model for the warp matrix in super-resolution video reconstruction","authors":"G. H. Costa, J. Bermudez","doi":"10.1109/ITS.2006.4433384","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433384","url":null,"abstract":"This paper advances in the analysis of the least mean square (LMS) algorithm applied to super-resolution reconstruction (SRR) of an image sequence. SRR of image sequences is highly dependent on the quality of the registration stage. When motion between frames is unknown and has to be estimated, the best available statistical model still requires the numerical estimation of the moments of the registration (warp) matrix. In this work we derive an analytical model for these moments for Gaussian registration errors. The new model allows for different boundary conditions. Monte Carlo simulation results illustrate the accuracy of the new analytical model.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121431041","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}
引用次数: 2
3D ray-tracing parallel model for radio-propagation prediction 用于无线电传播预测的三维射线追踪并行模型
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433282
A. Cavalcante, M. de Sousa, J. Costa, C. Frances, G. Protásio dos Santos Cavalcante, C. de Souza Sales
{"title":"3D ray-tracing parallel model for radio-propagation prediction","authors":"A. Cavalcante, M. de Sousa, J. Costa, C. Frances, G. Protásio dos Santos Cavalcante, C. de Souza Sales","doi":"10.1109/ITS.2006.4433282","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433282","url":null,"abstract":"A computational parallel model based on 3D ray- tracing for radio-propagation prediction is presented. This approach considers that the main tasks in a 3D ray-tracing technique can be evaluated in an independent and/or parallel way. The workload distribution among the participant nodes of the parallel architecture (cluster of PC's), is performed through a random assignment of the initial rays and the field points for them. Simulations are realized in order to validate and evaluate the performance of the proposed model.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132420699","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}
引用次数: 7
Numerical analysis in triangular and planar three-core nonlinear optical fiber couplers (TNLDC) operating logical gates 三角形和平面三芯非线性光纤耦合器(TNLDC)工作逻辑门的数值分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433233
J. Menezes, W. de Fraga, M. da Silva, A.C. Ferreira, A. Filho, A.F. de Morais Neto, C. Sobrinho, A. Sombra
{"title":"Numerical analysis in triangular and planar three-core nonlinear optical fiber couplers (TNLDC) operating logical gates","authors":"J. Menezes, W. de Fraga, M. da Silva, A.C. Ferreira, A. Filho, A.F. de Morais Neto, C. Sobrinho, A. Sombra","doi":"10.1109/ITS.2006.4433233","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433233","url":null,"abstract":"In this paper, we investigate the switching process in triangular symmetric and planar symmetric three-core nonlinear fiber coupler (TNLDC) and we have numerically shown, via the coupled nonlinear Schrodinger equations (NLSEs), that logic gates AND, OR and NXOR can be constructed from a triangular TNLDC while the planar TNLDC produced logical gates AND, NAND, OR, and XOR. We consider two basic models. The first, one triangular symmetrical structure with three cores in an equilateral-triangle arrangement and using a control signal (CS) applied to the first core and the second model present a transverse symmetrical structure with three cores in a parallel equidistant arrangement (or planar symmetrical structure), however the position of the control signal (CS) is applied to the input of the first fiber (core 1). Looking at the transmission characteristics of the device, through the direct and cross channel, we did a study of the extinction ratio (Xratio) of these devices. In comparing the performance of both switches operating as logic gates we will use the figure-of-merit of the logic gates [FOMELG(dB)] defined as a function of the extinction ratio of the gate outputs.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131432830","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}
引用次数: 2
Experimental and theoretical analysis of packaging inductances and stray capacitances of a Semiconductor Optical Amplifier 半导体光放大器封装电感和杂散电容的实验与理论分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433243
A.L. Toazza, M. Guimaraes, C.A.C. Petersen, C. Gallep, E. Conforti
{"title":"Experimental and theoretical analysis of packaging inductances and stray capacitances of a Semiconductor Optical Amplifier","authors":"A.L. Toazza, M. Guimaraes, C.A.C. Petersen, C. Gallep, E. Conforti","doi":"10.1109/ITS.2006.4433243","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433243","url":null,"abstract":"Impedance measurements of an encapsulated semiconductor optical amplifier (SOA) were used to obtain the SOA equivalent circuit parameters. The effect of decreasing the packaging inductances and stray capacitances are then analyzed aiming the SOA enhancement as a high-speed electro-optical switch.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131444807","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}
引用次数: 4
Improving DVB-T for Brazilian environments 改善巴西环境的DVB-T
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433302
C. Akamine, Y. Iano, R. Arthur, G. Bedicks, D. Gara Caetano
{"title":"Improving DVB-T for Brazilian environments","authors":"C. Akamine, Y. Iano, R. Arthur, G. Bedicks, D. Gara Caetano","doi":"10.1109/ITS.2006.4433302","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433302","url":null,"abstract":"In this paper the improvement in the performance obtained by a Time Interleaving applied to DVB-T scheme are analyzed in impulsive noise environments. The performance is evaluated in terms of bit error rate probability for Oms, 100 ms and 200 ms of time interleaving length. The results are compared with the standard DVB-T (digital video broadcasting - terrestrial) evaluated on Impulsive Noise channel and Multipath combined with impulsive noise channel. Simulation results shows that employing Time Interleaving only with 100 ms the overall system performance can improve significantly. These results are obtained applying an appropriate interleaving after the Mapper of DVB-T system.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131530964","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}
引用次数: 3
Spectral subtraction for reverberation reduction applied to automatic speech recognition 频谱减法在自动语音识别中的混响降低应用
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433380
F.S. Pacheco, R. Seara
{"title":"Spectral subtraction for reverberation reduction applied to automatic speech recognition","authors":"F.S. Pacheco, R. Seara","doi":"10.1109/ITS.2006.4433380","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433380","url":null,"abstract":"In real conditions, reverberation severely compromises the accuracy of automatic speech recognition (ASR) systems. The use and the assessment of spectral subtraction for reducing the reverberation effect in ASR systems is discussed. For such, a general procedure is presented. The influence of some important dereverberation parameters, such as the reverberation time, on the recognition rate is evaluated. By using the referred approach, the speech recognition rate is considerably improved.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130766533","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}
引用次数: 8
Conception and evaluation of access selection algorithms for cooperative beyond 3G systems 合作超3G系统接入选择算法的构想与评价
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433345
V. de Sousa, R.A. de O. Neto, F. de S. Chaves, A.P. da Silva, F. Cavalcanti
{"title":"Conception and evaluation of access selection algorithms for cooperative beyond 3G systems","authors":"V. de Sousa, R.A. de O. Neto, F. de S. Chaves, A.P. da Silva, F. Cavalcanti","doi":"10.1109/ITS.2006.4433345","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433345","url":null,"abstract":"As wireless technology evolve, we are seeing a tendency toward cooperative composite networks in which the diversity user demands can be properly met. The radio resource management (RRM) in such a network paradigm is a fascinating field of study and finding a cost-effective RRM solution is one of the greatest challenge faced by scientists today. This paper proposes an investigation of the access selection (AS) algorithms for the multi-access networks, aiming to indicate possible solutions based on actual radio resource consumptions and requirements. We assume that different radio access networks (RANs) are run by a single operator or a set of cooperative operators for which a proper inter-RAN signaling architecture is installed.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"91 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125393616","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}
引用次数: 3
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