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2006 International Telecommunications Symposium最新文献

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Alternatives of interactivity in a digital terrestrial TV platform: a techno-economic approach 数字地面电视平台中互动性的选择:技术-经济方法
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433242
M. C. Marques, Jason C Pinto, José M. Rios
{"title":"Alternatives of interactivity in a digital terrestrial TV platform: a techno-economic approach","authors":"M. C. Marques, Jason C Pinto, José M. Rios","doi":"10.1109/ITS.2006.4433242","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433242","url":null,"abstract":"Return channel interactivity is a digital TV feature that leads to a bidirectional information flow. This article presents an analysis of four technological alternatives for the digital terrestrial TV platform return channel subsystem, to be deployed in Brazil. Major aspects taken into account for choosing the most suitable alternative are highlighted, such as the performance and cost factors, in light of the country's regional social and economic differences, the conditions under which the broadcast and telecommunication services are rendered, and the coverage as well as the availability of the main networks that support such services. Deployment cost estimates related to the selected alternative - WiMAX - are also presented by considering the coverage arrangements that best satisfy Brazil's singularities, the TV signals coverage and the demographic conditions of each Brazilian municipality.","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":"129970634","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
A bounded-Q fast filter bank for audio signal analysis 用于音频信号分析的有界q快速滤波器组
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433420
F. Diniz, I. Kothe, L. Biscainho, S. L. Netto
{"title":"A bounded-Q fast filter bank for audio signal analysis","authors":"F. Diniz, I. Kothe, L. Biscainho, S. L. Netto","doi":"10.1109/ITS.2006.4433420","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433420","url":null,"abstract":"This paper describes a new spectral analysis tool, the bounded-Q fast filter bank (BQFFB), which consists of a high selectivity filter bank with a piecewise linear spacing between its channels. This approximately geometric representation yields relatively low computational cost and a suitable frequency resolution, thus making the BQFFB an efficient tool for musical analysis applications. A description of the BQFFB algorithm is presented along with a complete evaluation of its corresponding computational complexity. Computer simulations are then included to illustrate the BQFFB performance against other methods from the literature, such as the fast Fourier transform, the standard fast filter bank, and the constant-Q transform.","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":"129985129","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
Soft-decision demodulation of wavelet-coded PSK signals over flat rayleigh fading channels 平坦瑞利衰落信道上小波编码PSK信号的软判决解调
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433374
L. G. Q. S. Júnior, L. G. Q. Silveira, F.M. Assis, E. Pinto
{"title":"Soft-decision demodulation of wavelet-coded PSK signals over flat rayleigh fading channels","authors":"L. G. Q. S. Júnior, L. G. Q. Silveira, F.M. Assis, E. Pinto","doi":"10.1109/ITS.2006.4433374","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433374","url":null,"abstract":"This paper proposes a new soft-decision approach for demodulating wavelet-coded PSK signals, which is based on minimizing a mean squared error. Performance evaluation and comparison with the usual hard-decision demodulated wavelet- coded schemes are performed via computer simulation. The numerical results so obtained indicate that the proposed technique is an effective tool for performance improvement of wavelet-coded PSK systems. Therefore, this new approach for soft-decision may lead to new alternatives for exploiting the potential of wavelet coding for digital communications over wireless channels.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"31 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":"131781409","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
Assessing file formats for static image transmission 评估静态图像传输的文件格式
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433343
R.D. Lins, C.M. de Sa Rodrigues
{"title":"Assessing file formats for static image transmission","authors":"R.D. Lins, C.M. de Sa Rodrigues","doi":"10.1109/ITS.2006.4433343","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433343","url":null,"abstract":"This paper presents a comparative analysis between the three most important progressive file formats: PNG, JPEG and JPEG2000. Several types of images and features have been analyzed. This analysis provides elements for saving time and bandwidth in computer networks for image transmission and network browsing.","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":"130810405","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
MANETs for environmental monitoring 用于环境监测的manet
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433383
A. Vasiliou, A. Economides
{"title":"MANETs for environmental monitoring","authors":"A. Vasiliou, A. Economides","doi":"10.1109/ITS.2006.4433383","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433383","url":null,"abstract":"Environmental monitoring is important for life sustainability. Continuous measurements of environmental parameters may help to prevent and cope with environmental damages. Sensors that measure environment's conditions may be placed at appropriate locations and transmit environmental data. In a case of emergency, environmentalist rush to the affected area to analyze the problem and take appropriate actions. They have to communicate among themselves and collect data from the sensors. This paper proposes the use of MANETs (Mobile Ad Hoc Networks) to support the communications among sensors and environmentalists. Simulation results show that MANETs can support reliable communications.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"3 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":"130898401","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: 17
Statistical analysis of the FXLMS algorithm about the steady-state solution 统计分析了FXLMS算法的稳态解
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433289
L. Resende, J. Bermudez
{"title":"Statistical analysis of the FXLMS algorithm about the steady-state solution","authors":"L. Resende, J. Bermudez","doi":"10.1109/ITS.2006.4433289","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433289","url":null,"abstract":"This paper presents a statistical analysis of the filtered-x LMS algorithm about the steady-state solution. Analytical models are derived for the mean weight-error vector and the mean square error behaviors which are simpler than existing models. The simpler models allow the determination of new convergence and steady-state results that should prove useful for design purposes. Simulation results display excellent agreement between theoretical predictions and Monte Carlo simulation results. Examples show that the new theory can be used to predict both transient and steady-state behaviors of the FXLMS algorithm in active control of sound and vibration.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"81 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":"132161640","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: 6
Modified MODEX method for direction finding with improved threshold performance 改进的MODEX测向方法，提高了阈值性能
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433241
R. Krummenauer, F.J. da Silva, A. Lopes
{"title":"Modified MODEX method for direction finding with improved threshold performance","authors":"R. Krummenauer, F.J. da Silva, A. Lopes","doi":"10.1109/ITS.2006.4433241","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433241","url":null,"abstract":"We propose to modify the MODEX algorithm for estimating direction of arrival (DOA) of plane waves using array of sensors. The MODEX algorithm is a method of direction estimation (MODE) based estimator that conveniently increases the number of MODE estimates, increasing the order of the polynomial, whose roots (candidates) estimate the DOA parameters. To select the better set of candidates, MODEX employs a maximum likelihood (ML) procedure. The proposed method affects the candidate selection process and improves its performance. This performance gain is achieved by replacing the original sample covariance matrix by a new one computed after a noise reduction filtering on the snapshot vectors. The modified selection procedure improves the MODEX performance and reduces significantly the threshold signal-to- noise ratio.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"88 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":"132689246","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
Face recognition independent of facial expression through SOM-based classifiers 通过基于som的分类器进行独立于面部表情的人脸识别
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433281
Isaque Q. Monteiro, Samy D. Queiroz, A. T. Carneiro, L. G. Souza, G. Barreto
{"title":"Face recognition independent of facial expression through SOM-based classifiers","authors":"Isaque Q. Monteiro, Samy D. Queiroz, A. T. Carneiro, L. G. Souza, G. Barreto","doi":"10.1109/ITS.2006.4433281","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433281","url":null,"abstract":"In this paper, we evaluate four pattern classifiers built from the self-organizing map (SOM), a well-known neural clustering algorithm, in the recognition of faces independent of facial expression. The design of two of the classifiers involves post-training procedures for labelling the neurons, i.e. no class information is used prior to the training phase. The other two classifiers incorporate class information prior to the training phase. All the classifiers are evaluated using the well-known Yale face database and their performances compare favorably with standard neural supervised classifiers.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"4 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":"114618075","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: 6
Fault tolerance in IEEE 802.11 WLANs IEEE 802.11 wlan的容错性
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433349
Flavio E. de Deus, R. Puttini, L. Molinaro, H. Abdalla, G. Amvame-Nze, J. Kabara
{"title":"Fault tolerance in IEEE 802.11 WLANs","authors":"Flavio E. de Deus, R. Puttini, L. Molinaro, H. Abdalla, G. Amvame-Nze, J. Kabara","doi":"10.1109/ITS.2006.4433349","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433349","url":null,"abstract":"in this paper, we address the problem of enhancing the fault tolerance of IEEE 802.11 wireless local area networks focusing on tolerating access point - AP failures. We develop a fault detection approach, which promises to be more effective to identify AP failures. In particular, we focus on the problem of overcoming APs failures working with reconfiguration of the remaining APs by changing parameters such as power level and frequency channels. Our approach consists of two main phases: Design and Fault Response. In Design phase, we deal with quantifying, placement and setting up of APs according to both area coverage and performance criteria. In Fault Response phase we consider the reconfiguration of active APs in order to deal with AP fault in the service area. Finally, we describe one of the major characteristics of the proposed architecture, which is a simple implementation in concordance with established IEEE 802.11 standards and related management systems.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"31 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":"116404293","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: 6
Second-order statistics for the envelope and phase of η-μ generalized fading channels η-μ广义衰落信道包络和相位的二阶统计量
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433403
D. B. da Costa, M. Yacoub, G. Fraidenraich
{"title":"Second-order statistics for the envelope and phase of η-μ generalized fading channels","authors":"D. B. da Costa, M. Yacoub, G. Fraidenraich","doi":"10.1109/ITS.2006.4433403","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433403","url":null,"abstract":"This paper proposes an analysis of the second-order statistics concerning the envelope and phase of eta-mu generalized fading channels. So, a simple and closed-form expression for the phase crossing rate of the signal operating in such channels will be obtained. Furthermore, exact expressions for the level crossing rate and average fade duration of eta-mu channels will also be attained. The analytical results are thoroughly validated by reducing the general case to some particular cases (Nakagami-m, Hoyt, and Rayleigh), for which the solutions are known, and by means of Monte Carlo simulation, for the more general case.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"58 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":"123618233","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
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