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2006 International Telecommunications Symposium最新文献

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Combining diversity and multiplexing in wireless communications systems 无线通信系统中分集和多路复用的结合
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433333
J.R.C. Aragon, E.M.G. Fernandez
{"title":"Combining diversity and multiplexing in wireless communications systems","authors":"J.R.C. Aragon, E.M.G. Fernandez","doi":"10.1109/ITS.2006.4433333","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433333","url":null,"abstract":"This paper presents a simple multiple-input multiple output (MIMO) hybrid system for wireless channels trying to achieve near optimal values of diversity-multiplexing tradeoff. The hybrid systems studied combine well known space time codes and full multiplexing schemes. A decoding procedure for the hybrid systems using linear combinatorial nulling and symbol cancellation is also presented. Through computer simulation upon different digital modulation constellations, the error performance and spectral efficiency of the hybrid systems are compared to the diversity-only and multiplexing-only schemes.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"17 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":"121796438","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
On the multivariate α-µ distribution with arbitrary correlation 任意相关的多元α-µ分布
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433238
R. D. de Souza, G. Fraidenraich, M. Yacoub
{"title":"On the multivariate α-µ distribution with arbitrary correlation","authors":"R. D. de Souza, G. Fraidenraich, M. Yacoub","doi":"10.1109/ITS.2006.4433238","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433238","url":null,"abstract":"In this paper, an exact new closed formula for the multivariate alpha-mu joint probability density function (PDF) is derived allowing for an arbitrary correlation matrix. In addition, the bit error rate (BER) and the outage probability for the selection combining (SC) technique in a correlated alpha-mu fading channel is obtained.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"60 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":"132430459","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
Voice over IP quality of service using active queue management 使用主动队列管理的IP语音服务质量
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433387
V. A. Reguera, F.F. Alvarez Paliza, E. M. García Fernández, W. Godoy
{"title":"Voice over IP quality of service using active queue management","authors":"V. A. Reguera, F.F. Alvarez Paliza, E. M. García Fernández, W. Godoy","doi":"10.1109/ITS.2006.4433387","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433387","url":null,"abstract":"This paper presents a comprehensive study about the impact of active queue management (AQM) on voice over Internet protocol (VoIP) quality of service. One of the most representative AQM scheme is analyzed through extensive simulation and its effect on the perceived quality of voice calls is evaluated. Different network scenarios, changing network loads and different scheme control parameters are investigated. Network impairments are related to user perception by means of well known algorithmic models, expressing user satisfaction in the MOS scale. The main results obtained show that the use of active queue management schemes like adaptive random early detection (ARED) significantly improve the perceived quality of voice calls.","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":"131043735","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
Parafac-based blind channel identification using 4th-order cumulants 基于parafac的4阶累积量盲信道识别
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433376
C. Fernandes, G. Favier, J. Mota
{"title":"Parafac-based blind channel identification using 4th-order cumulants","authors":"C. Fernandes, G. Favier, J. Mota","doi":"10.1109/ITS.2006.4433376","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433376","url":null,"abstract":"Strong relationships between joint- diagonalization and tensor decompositions have been established recently. In this paper we propose a finite impulse response (FIR) channel identification method based on the Parafac decomposition of a 3rd-order tensor composed of the 4-th order output cumulants. By avoiding the prewhitening operation required by joint-diagonalization based methods, our method is shown to improve the estimation performance provided by the classic joint-diagonalization algorithm.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"18 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":"134504388","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
Optimization of wavelength assignment in an optical link considering four wave mixing using genetic algorithm 基于遗传算法的四波混频光链路波长分配优化
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433231
Helder A. Pereira, D. Chaves, C. Bastos-Filho, J. Martins-Filho
{"title":"Optimization of wavelength assignment in an optical link considering four wave mixing using genetic algorithm","authors":"Helder A. Pereira, D. Chaves, C. Bastos-Filho, J. Martins-Filho","doi":"10.1109/ITS.2006.4433231","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433231","url":null,"abstract":"This article presents a new strategy to assign wavelengths in an optical link considering the four wave mixing effect in the optical fiber, for different sizes of wavelength grids. The four wave mixing effect is taken into account by using a formulation that calculates the fiber noise figure for each wavelength. We obtain the distributions of wavelengths from a genetic algorithm, which considers the quality of service criterion based on bit error rate. We show that our strategy is capable of determining assignments of wavelength that minimizes the impact of the four wave mixing effect. We also analyze the performance of our proposed genetic algorithm.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"294 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":"134328868","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
Circulant graphs and spherical codes 循环图和球码
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433239
S. Costa, J. Strapasson, R. M. Siqueira, M. Muniz
{"title":"Circulant graphs and spherical codes","authors":"S. Costa, J. Strapasson, R. M. Siqueira, M. Muniz","doi":"10.1109/ITS.2006.4433239","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433239","url":null,"abstract":"Circulant graphs are homogeneous graphs with special properties which have been used to build interconnection networks for parallel computing. The association of circulant graphs to a spherical code in dimension 2k is presented here via the construction of an isomorphic graph supported by a lattice in Rk.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"11 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":"130140831","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
Evaluation of wireless links in a hybrid network structure for mobile VoIP services 移动VoIP服务混合网络结构中无线链路的评价
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433315
D.F.S. Santos, J. L. Nascimento, O.C. Silva Filho, A. Perkusich
{"title":"Evaluation of wireless links in a hybrid network structure for mobile VoIP services","authors":"D.F.S. Santos, J. L. Nascimento, O.C. Silva Filho, A. Perkusich","doi":"10.1109/ITS.2006.4433315","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433315","url":null,"abstract":"Wireless technologies and new Internet services are making available new kinds of solutions and driving new users needs. In order to guarantee the quality of services provided by these solutions, experimental analysis plays a key role. This article presents an evaluation of a solution to provide voice services for users with mobile devices based on the Internet. We also consider a scenario with different wireless network technologies, more specifically Bluetooth and Wi-Fi. The experimental results were obtained based on a functional mobile VoIP infrastructure, named M-VoIP. Based on the results it was possible to identify the major limitations of the M-VoIP solution.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"46 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":"114938592","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
Wavelet analysis as an information processing technique 小波分析作为一种信息处理技术
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433232
Hélio M. de Oliveira, D. F. D. Souza
{"title":"Wavelet analysis as an information processing technique","authors":"Hélio M. de Oliveira, D. F. D. Souza","doi":"10.1109/ITS.2006.4433232","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433232","url":null,"abstract":"A new interpretation for the wavelet analysis is reported, which can is viewed as an information processing technique. It was recently proposed that every basic wavelet could be associated with a proper probability density, allowing defining the entropy of a wavelet. Introducing now the concept of wavelet mutual information between a signal and an analysing wavelet fulfils the foundations of a wavelet information theory (WIT). Both continuous and discrete time signals are considered. Finally, we showed how to compute the information provided by a multiresolution analysis by means of the inhomogeneous wavelet expansion. Highlighting ideas behind the WIT are presented.","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":"130572869","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: 5
Performance monitoring of individual VoIP flows on DiffServ networks DiffServ网络上单个VoIP流的性能监控
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433301
Edmundo Zuchowski Filho, K. Fonseca
{"title":"Performance monitoring of individual VoIP flows on DiffServ networks","authors":"Edmundo Zuchowski Filho, K. Fonseca","doi":"10.1109/ITS.2006.4433301","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433301","url":null,"abstract":"The performance of an individual flow that belongs to a DiffServ class aggregate is an actual issue when the flow refers to QoS-demanding applications, like Voice over IP. However, through a careful choice of a control flow, a performance inference about flow aggregate individuals can be achieved. Computer simulations with synthetic VoIP traffic allow us to establish a method that relates delay and delay jitter metrics of a reference flow to infer about individual performance of flows belonging to the same DiffServ class aggregate. The evaluation was carried out for homogeneous flow aggregates (flows generated by the same voice codec) as well as non-homogeneous (several codecs). Extensive simulations and statistical analysis allowed us to conclude about the control flow characterization, its accuracy to represent the performance of individual flows of the aggregate and the impact of the VoIP traffic models over the achieved results.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"34 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":"132588457","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
Analyzing the QoS of VoIP on SIP in Java 基于Java的SIP VoIP服务质量分析
2006 International Telecommunications Symposium Pub Date : 2006-09-01 DOI: 10.1109/ITS.2006.4433340
J. M. M. D. Silva, Rafael Dueire Lins
{"title":"Analyzing the QoS of VoIP on SIP in Java","authors":"J. M. M. D. Silva, Rafael Dueire Lins","doi":"10.1109/ITS.2006.4433340","DOIUrl":"https://doi.org/10.1109/ITS.2006.4433340","url":null,"abstract":"Java is a platform independent, portable, robust and distributed programming language suitable for the development of Internet applications. Performance is its strongest limitation. This paper analyses the quality of service provided by the session initiation protocol (SIP) for Voice on IP implemented in Java. Delay, jitter and packet losses are tested.","PeriodicalId":271294,"journal":{"name":"2006 International Telecommunications Symposium","volume":"57 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":"126081734","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: 5
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