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Anais do XXVI Simpósio Brasileiro de Telecomunicações最新文献

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Optical transmission of frequency-coded quantum bits with WDM synchronization WDM同步下频率编码量子比特的光传输
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42879
T. F. D. Silva, J. P. Weid
{"title":"Optical transmission of frequency-coded quantum bits with WDM synchronization","authors":"T. F. D. Silva, J. P. Weid","doi":"10.14209/sbrt.2008.42879","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42879","url":null,"abstract":"Quantum key distribution enables absolutely secure communication between two parties, making them able to share a secret that will be used in the posterior message encryption. Here we shall report the experimental implementation of an optical qubits transmission system compatible with BB84-based protocols. The photonic qubits preparation and measurement are performed by a double-modulation process according with the relative phase of a WDM carried synchronized radiofrequency signal, in the way that the quantum states are coded in the optical sidebands. A filtering scheme is applied to the further sidebands selection, delivering the qubits to single-photon detectors.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126523622","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
Solução de implementação do multiplexador do sistema ISDB-TB ISDB-TB系统多路复用器实现方案
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42443
Juliano Ferreira, M. Paiva, L. Mendes
{"title":"Solução de implementação do multiplexador do sistema ISDB-TB","authors":"Juliano Ferreira, M. Paiva, L. Mendes","doi":"10.14209/sbrt.2008.42443","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42443","url":null,"abstract":"—The adoption of ISDB-TB in Brazil has opened new opportunities for the brazilian industry development. The small, but important, modifications introduced in ISDB-TB version related with the original ISDB-T standard result that the solutions developed for japanese market is not always suitable for Brazil. A key part of the digital television system that fills in this scenario is the multiplexer. The aim of this paper is, firstly, present the main functions of the multiplexer, showing its importance in the digital television system. This paper also presents a description of each block of the multiplexer, in order to allow the implementation of this device using a FPGA platform.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127851653","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
Super-resolution applied to Distributed Video Coding with Spatial Scalability 超分辨率在空间可扩展性分布式视频编码中的应用
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42524
B. Macchiavello, F. Brandi, R. Queiroz, D. Mukherjee
{"title":"Super-resolution applied to Distributed Video Coding with Spatial Scalability","authors":"B. Macchiavello, F. Brandi, R. Queiroz, D. Mukherjee","doi":"10.14209/sbrt.2008.42524","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42524","url":null,"abstract":"Distributed Video Coding is a new video coding paradigm that enables video codecs with reversed complexity. It is well-known that the performance of any distributed video coder is heavily dependent on the quality of the side information generated by motion-estimation at the decoder. As a continuation of previous works, in this paper we propose to use a super-resolution method to up-sample the non-key frames using the key frames as reference, in order to improve the side information generation in a distributed video coding scheme with spatial scalability. The framework, proposed in previous works, enables reduced encoding complexity by reduced spatial-resolution encoding of the non-reference frames, followed by Wyner-Ziv coding of the Laplacian residue. The side information generation is iterative, in the first iteration the high-frequency data of matching blocks from the key frames are added to the low-resolution blocks of the interpolated downsampled frames. Results are presented using the state-of-the-art video coding standard H.264/AVC. Keywords— Super-resolution, Wyner-Ziv, spatial scalabilty.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114562036","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
Uma combinação afim de dois equalizadores autodidatas adaptados com o CMA 两个适应CMA的自学习均衡器的仿射组合
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42827
R. Candido, M. Silva, Vitor H. Nascimento
{"title":"Uma combinação afim de dois equalizadores autodidatas adaptados com o CMA","authors":"R. Candido, M. Silva, Vitor H. Nascimento","doi":"10.14209/sbrt.2008.42827","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42827","url":null,"abstract":"estacion´arios e n˜ao-estacion´arios. Al´em disso, s˜ao","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124453915","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
Caracterização Eletromagnética de Alvos Simples 简单目标的电磁特性
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42538
S. Sant'Anna, J. Lacava, D. Fernandes
{"title":"Caracterização Eletromagnética de Alvos Simples","authors":"S. Sant'Anna, J. Lacava, D. Fernandes","doi":"10.14209/sbrt.2008.42538","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42538","url":null,"abstract":"—The computation of the radar cross section (RCS) and the polarimetric response of electric dipoles printed in multilayer planar structures is addressed in this work. Software based on spectral moment methods and implemented in IDL language is presented. This software is user-friendly and easy to operate, since it is based on graphical interfaces.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125916234","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
Redução da Taxa de Queda de Chamada em Rede Celular GSM por Meio de Ajustes de Parâmetros de Cobertura 通过调整覆盖参数，降低GSM蜂窝网络的掉线率
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42394
G. Pivaro, A. César
{"title":"Redução da Taxa de Queda de Chamada em Rede Celular GSM por Meio de Ajustes de Parâmetros de Cobertura","authors":"G. Pivaro, A. César","doi":"10.14209/sbrt.2008.42394","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42394","url":null,"abstract":"","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124671369","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
Esquemas de Modulação Não-Linear Associadas a Superfícies Mínimas 与最小曲面相关的非线性调制方案
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42855
R. Cavalcante, Reginaldo Palazzo
{"title":"Esquemas de Modulação Não-Linear Associadas a Superfícies Mínimas","authors":"R. Cavalcante, Reginaldo Palazzo","doi":"10.14209/sbrt.2008.42855","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42855","url":null,"abstract":"— In this paper we use a geometrical interpretation that associates twisted modulation schemes to surfaces in Eucli-dian space to design and analyze new non-linear modulations. Thus, an approximate expression for the mean-square error was derived and applied to spaces of constant sectional curvature, indicating the use of hyperbolic space for the project of modulations. Moreover, non-linear modulations associated with minimal surfaces were related the minimization of the mean-square error and a modulation associated with the helicoide minimal surface was proposed. Finally, we determine a condition involving the noise average energy and the mean and Gaussian curvatures with the objective of to minimize the threshold error.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"137 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128682961","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
Speech Recognition for Brazilian Portuguese using the Spoltech and OGI-22 Corpora 使用Spoltech和OGI-22语料库的巴西葡萄牙语语音识别
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42724
Patrick Silva, Nelson Neto, A. Klautau, Andre Gustavo Adami, I. Trancoso
{"title":"Speech Recognition for Brazilian Portuguese using the Spoltech and OGI-22 Corpora","authors":"Patrick Silva, Nelson Neto, A. Klautau, Andre Gustavo Adami, I. Trancoso","doi":"10.14209/sbrt.2008.42724","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42724","url":null,"abstract":"Speech processing is a data-driven technology that relies on public corpora and associated resources. In contrast to languages such as English, there are few resources for Brazilian Portuguese (BP). This work describes efforts toward decreasing such gap and presents systems for speech recognition in BP using two public corpora: Spoltech and OGI-22. The following resources are made available: ATK and HTK scripts, pronunciation dictionary, language and acoustic models. The work discusses thebaselineresults obtained with these resources. Keywords— Speech recognition, Brazilian Portuguese, HMMs, pronunciation dictionary.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"360 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132033223","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
Otimização de Limiares Para Adaptação de Modulação Diante de Erros de Estimação do Canal de Retorno 针对返回信道估计误差的调制自适应阈值优化
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42767
E. Gurjão, J. Galdino
{"title":"Otimização de Limiares Para Adaptação de Modulação Diante de Erros de Estimação do Canal de Retorno","authors":"E. Gurjão, J. Galdino","doi":"10.14209/sbrt.2008.42767","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42767","url":null,"abstract":"","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130506418","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
Seleção de caminho baseada em atraso para sistemas multi-abrigados usando SCTP 使用SCTP的多庇护系统基于延迟的路径选择
Anais do XXVI Simpósio Brasileiro de Telecomunicações Pub Date : 1900-01-01 DOI: 10.14209/sbrt.2008.42872
Igor Gavriloff, Eduardo Parente Ribeiro
{"title":"Seleção de caminho baseada em atraso para sistemas multi-abrigados usando SCTP","authors":"Igor Gavriloff, Eduardo Parente Ribeiro","doi":"10.14209/sbrt.2008.42872","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42872","url":null,"abstract":"—This article evaluates the route selection performance in multihomed systems using SCTP as the transport protocol for multimedia traffic. The route selection mechanism was implemented using the NS-2 network simulator. The performance evaluation is given by a metric derived from a ITU-T recomendation.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"379 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126724950","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
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