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2006 International Telecommunications Symposium最新文献

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Pause insertion based on a morphosyntactic parser for Brazilian Portuguese text-to-speech systems 基于巴西葡萄牙语文本到语音系统的形态语法解析器的暂停插入
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433366
I. C. Seara, Sandra G. Kafka, R. Seara, Simone Klein, F.S. Pacheco
{"title":"Pause insertion based on a morphosyntactic parser for Brazilian Portuguese text-to-speech systems","authors":"I. C. Seara, Sandra G. Kafka, R. Seara, Simone Klein, F.S. Pacheco","doi":"10.1109/ITS.2006.4433366","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433366","url":null,"abstract":"Based on a morphosyntactic parser a set of rules for inserting silence pauses in synthesized sentences coming from a Brazilian Portuguese text-to-speech (TTS) system is proposed. Such rules are determined as a function of the morphological class of words that compose the synthesized sentence, aiming to improve the TTS prosody. In order to assess the quality of the synthesized speech before and after inserting silence pauses, comparison category rating (CCR) listening tests are accomplished. Comparison mean opinion score (CMOS) results point out a considerable improvement in speech naturalness.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"64 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120821580","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: 1
Neuromodelling of tapered microstrip antennas and frequency selective surfaces 锥形微带天线和频率选择表面的神经建模
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433319
P. L. D. da Silva, A. D’assunção
{"title":"Neuromodelling of tapered microstrip antennas and frequency selective surfaces","authors":"P. L. D. da Silva, A. D’assunção","doi":"10.1109/ITS.2006.4433319","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433319","url":null,"abstract":"The main objective of this work is the application of Artificial Neural Networks (ANN) in the analysis of microwave integrated circuits, such as tapered microstrip antennas and frequency selective surfaces (FSS). The advantages of modeling these devices through neural networks are discussed. The ANN results are presented and validated with those from the method of moments (MoM). The antenna ANN results are presented and validated with measured ones. Furthermore, a good generalization capacity of the ANN analysis was observed.","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":"116611077","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 comparison between the perfectly matched layer and the self-teleportation of fields conditions 完全匹配层与自传送场条件之比较
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433326
A. Milagre, S. Barbin
{"title":"A comparison between the perfectly matched layer and the self-teleportation of fields conditions","authors":"A. Milagre, S. Barbin","doi":"10.1109/ITS.2006.4433326","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433326","url":null,"abstract":"One of the most important issues in the finite difference time domain (FDTD) method is the choice of the absorbing boundary condition (ABC) when applied to radiation problems. the most popular abc is the perfectly matched layer (PML), but it has some drawbacks in comparison to ABCs based on radiation boundary condition (RBC). More recently, Diaz and Scherbatko developed a new technique called self- teleportation of fields (STF), which lead to a new ABC. In this paper, a comparison is made between the PML and the STF in relation to the attenuation behavior and computational burden.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"70 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":"123213469","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
Multiresolution Division Multiplex (MRDM): A new wavelet-based multiplex system 多分辨分复用(MRDM):一种基于小波的新型复用系统
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433262
Hélio M. de Oliveira, E. Bouton
{"title":"Multiresolution Division Multiplex (MRDM): A new wavelet-based multiplex system","authors":"Hélio M. de Oliveira, E. Bouton","doi":"10.1109/ITS.2006.4433262","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433262","url":null,"abstract":"An original multiplex scheme is introduced, which is based on Mallat's multiresolution formulation of wavelet systems. This system is adaptable and its implementation is well matched to digital signal processors and computers. The approach termed multiresolution division multiplex (MRDM) is intensive in signal processing (SP) tools, extremely flexible and can combine a variety of tributaries at different bit rates. A broad variety of orthogonal wavelet systems {phik,psik,j} can endow with MRDM and the channel waveforms, and consequently the spectral shape and system performance depend upon the selected wavelets. Demultiplex can be done efficiently, since the number of floating multiplications and additions increase only linearly with the length of signals. A Haar-based MRDM scheme is presented to illustrate the versatility of this new multiplex approach.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"90 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":"129640831","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: 1
On the convergence speed of inverse identification adaptive IIR filters 逆辨识自适应IIR滤波器的收敛速度
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433338
P. Burt
{"title":"On the convergence speed of inverse identification adaptive IIR filters","authors":"P. Burt","doi":"10.1109/ITS.2006.4433338","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433338","url":null,"abstract":"The approach based on balanced realization theory, previously used to analyze the convergence speed of adaptive IIR filters in the identification configuration and to propose a faster algorithm (sucessive approximations algorithm), is now used in the inverse identification configuration. This case is of interest for applications such as channel equalization and system identification itself. The main result we obtain here is that, while in identification configuration the Hankel singular values of the system being identified have an important effect on convergence speed, in the inverse identification case it is the Hankel singular values of a certain system related to the system being identified that have this role. From this result, a condition for faster convergence speed is obtained, which suggests that an adaptive algorithm similar to the sucessive approximations algorithm can be obtained for inverse identification. Numerical examples are presented, which strongly corroborate the adopted analytical approach.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"35 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":"129044875","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
Stochastic model for the NSAF algorithm considering slow adaptation and Gaussian data 考虑慢适应和高斯数据的NSAF算法的随机模型
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433402
J. Kolodziej, O. J. Tobias, R. Seara
{"title":"Stochastic model for the NSAF algorithm considering slow adaptation and Gaussian data","authors":"J. Kolodziej, O. J. Tobias, R. Seara","doi":"10.1109/ITS.2006.4433402","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433402","url":null,"abstract":"This paper proposes a stochastic model for the normalized subband adaptive filters (NSAFs), considering slow adaptation and Gaussian input signals. Such a filter structure is an alternative to the classical full-band normalized least-mean-square (NLMS) algorithm, aiming to improve the convergence speed under correlated input data. Analytical models for the first moment of the adaptive filter weight vector and the learning curve are derived. For such, the time-varying nature of the normalized step-size parameter as well as a regularization factor, which prevents division by zero during the normalizing operation, are taken into account. Through numerical simulations the accuracy of the proposed model is confirmed.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"328 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":"127814610","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
An optical UNI architecture for the GIGA project testbed network 用于GIGA项目测试平台网络的光UNI架构
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433285
Rafael Pasquini, F. Verdi, L. G. Zuliani, Mauricio Ferreira Magalhães, Sandro Rossi
{"title":"An optical UNI architecture for the GIGA project testbed network","authors":"Rafael Pasquini, F. Verdi, L. G. Zuliani, Mauricio Ferreira Magalhães, Sandro Rossi","doi":"10.1109/ITS.2006.4433285","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433285","url":null,"abstract":"The main interests of the GIGA Project are the deployment of Optical Network Technology, Network Services and Applications, Experimental Telecommunication Services and Scientific Applications. In the context of this Project, our research group has been working in the design of a IP/WDM Control Plane to integrate the IP/MPLS Client Network with the Optical Transport Network (WDM), according to the GMPLS and ASON specifications. We propose a UNI (User Network Interface) architecture providing an independent signaling protocol to integrate the Client and the Optical Transport Networks. The proposed UNI architecture maintains unchanged the client and transport networks signaling semantics for the GIGA testbed network. The paper describes how the designed architecture supports the independence of the signaling protocol and presents the prototype implemented to validate the architecture.","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":"121023110","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
Impact of intelligent access selection algorithms in cooperative wireless networks 智能接入选择算法对协同无线网络的影响
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433348
F. Cavalcanti, V. de Sousa, R.A. de O. Neto, F. Chaves
{"title":"Impact of intelligent access selection algorithms in cooperative wireless networks","authors":"F. Cavalcanti, V. de Sousa, R.A. de O. Neto, F. Chaves","doi":"10.1109/ITS.2006.4433348","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433348","url":null,"abstract":"Future generation of wireless networks will solicit the cooperation of heterogeneous Radio Access Networks (RANs) in order to provide multimedia traffic to different classes of users with varying Quality of Service (QoS) requirements over regions and time zones. The use of such RANs as subsystems of a larger wireless network, i.e, a multi-access network, claims for an Access Selection (AS) scheme to coordinate the load sharing so as to meet the optimum combined network performance. Depending on the individual subsystem capacities, the traffic load conditions and the subsystem channel quality, an intelligent AS algorithm can provide capacities beyond the sum of the subsystems capacities. This paper addresses the issue of the AS in the context of multi-access networks. We intend to provide an analytical formulation which indicates the suitable/unsuitable scenarios for employment of an intelligent AS strategy. The usability of the proposed qualitative studies are demonstrated by means of simulations.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"14 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":"121055500","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
Joint transmit diversity and downlink beamforming by using a minimum BER criterion 使用最小误码率准则的联合发射分集和下行波束形成
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433275
D. Zanatta Filho, L. Féty
{"title":"Joint transmit diversity and downlink beamforming by using a minimum BER criterion","authors":"D. Zanatta Filho, L. Féty","doi":"10.1109/ITS.2006.4433275","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433275","url":null,"abstract":"In this work, we propose a novel criterion to find the optimum precoder for joint transmit diversity and downlink beamforming. This precoder is an extension of the purely spatial downlink beamforming and can be seen as a transformation that transforms K real antennas into L virtual antennas, with L les K. The proposed criterion is based on the minimization of the received BER and extends the previous technique [1] (Eigen- Beamforming) to any type of channel distribution, not only Rayleigh. Simulation results show that the proposed technique is equivalent to Eigen-Beamforming for Rayleigh channel, but outperforms the latter for Rician channels, providing substantial improvement. This makes the proposed technique an attractive solution for the general application, where the channel type is not known a priori.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"53 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":"121058545","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: 1
Adding diversity to multi-user downlink beamforming by using BER constraints 利用误码率约束增加多用户下行波束形成的分集
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433358
D. Zanatta Filho, L. Féty, J. Romano
{"title":"Adding diversity to multi-user downlink beamforming by using BER constraints","authors":"D. Zanatta Filho, L. Féty, J. Romano","doi":"10.1109/ITS.2006.4433358","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433358","url":null,"abstract":"In this work, we propose a novel structure and criterion for joint transmit diversity and multi-user downlink beamforming. The proposed structure can be seen as an extension of the purely spatial downlink beamforming and is a transformation that, for each user, transforms K real antennas into L virtual antennas, with L les K. Classical transmit diversity is then applied to these virtual antennas. We propose a design criterion to optimize the precoders in order to find the best trade-off between minimizing the interference generated towards the other users and maximizing the channel diversity for the desired user. This criterion is based on the minimization of the total transmit power subjected to a target BER constraint for each user. Applied to a multiple-antenna transmitter, the proposed technique outperforms the purely-spatial downlink beamformer by about 5 dB for a target BER of 10-2 in a simple scenario.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"112 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":"116571870","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: 1
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