{"title":"Conjuntos de Seqüências para Sistemas QS-CDMA com Detecção Multiusuário Sujeitos a Desvanecimento Multipercurso","authors":"A. S. R. Kuramoto, T. Abrão, P. Jeszensky","doi":"10.14209/sbrt.2003.425","DOIUrl":"https://doi.org/10.14209/sbrt.2003.425","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"35 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":"132477328","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}
S. G. Araújo, A. C. P. Pedroza, A. Mesquita, I. Introdução
This work uses Genetic Programming to automatically generate finite-state models that synthesize protocol specifications from protocol service specification. The approach reduces computation applicable to finite-state automata in traditional protocol synthesis methods, abstracting the protocol designer from such tasks.
{"title":"Uma Metodologia de Projeto de Protocolos de Comunicação Baseada em Técnicas Evolutivas","authors":"S. G. Araújo, A. C. P. Pedroza, A. Mesquita, I. Introdução","doi":"10.14209/sbrt.2003.801","DOIUrl":"https://doi.org/10.14209/sbrt.2003.801","url":null,"abstract":"This work uses Genetic Programming to automatically generate finite-state models that synthesize protocol specifications from protocol service specification. The approach reduces computation applicable to finite-state automata in traditional protocol synthesis methods, abstracting the protocol designer from such tasks.","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"25 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":"132595692","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}
Lately it was observed a growing interest in the use of direct-sequence code division multiple access technique (DS-CDMA) for cellular mobile systems. The capacity of a CDMA system is directly related to the frequency reuse efficiency (F). Furthermore, the factor F determination by models, that assume a simple exponential law to find the pathloss, can generate inexact values for the capacity. This work considers the use of empirical and theoretical radio propagation models to estimate the frequency reuse efficiency and to analyze the influence of their parameters on the system capacity.
{"title":"Determinação da Eficiência de Reuso de Freq üência de um Sistema DS - CDMA através de Modelos de Radiopropagação","authors":"Rio de Janeiro., A. d'Assunção","doi":"10.14209/sbrt.2003.749","DOIUrl":"https://doi.org/10.14209/sbrt.2003.749","url":null,"abstract":" Lately it was observed a growing interest in the use of direct-sequence code division multiple access technique (DS-CDMA) for cellular mobile systems. The capacity of a CDMA system is directly related to the frequency reuse efficiency (F). Furthermore, the factor F determination by models, that assume a simple exponential law to find the pathloss, can generate inexact values for the capacity. This work considers the use of empirical and theoretical radio propagation models to estimate the frequency reuse efficiency and to analyze the influence of their parameters on the system capacity.","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"96 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":"131925414","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}
{"title":"Simulação Eficiente da BER de Sinais Distorcidos por Circuitos Não- lineares","authors":"L. Brito, P. H. D. Carvalho","doi":"10.14209/sbrt.2003.543","DOIUrl":"https://doi.org/10.14209/sbrt.2003.543","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"43 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":"133224169","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}
{"title":"Uma Análise de Protocolos de Roteamento Sob Demanda de Redes Ad Hoc","authors":"B. A. Villela, O. C. Duarte","doi":"10.14209/sbrt.2003.765","DOIUrl":"https://doi.org/10.14209/sbrt.2003.765","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"126 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":"122496115","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}
{"title":"Sistemas Hiperbólicos de Localização Móvel Celular","authors":"H. Zampier, M. A. Grivet","doi":"10.14209/sbrt.2003.509","DOIUrl":"https://doi.org/10.14209/sbrt.2003.509","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"93 3 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":"128924316","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}
{"title":"Redução de Distorção Harmônica em Amplificadores por meio de Filtros Adaptativos Analógicos","authors":"Vitor H. Nascimento, Yuri S. Provase","doi":"10.14209/sbrt.2003.592","DOIUrl":"https://doi.org/10.14209/sbrt.2003.592","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"177 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":"115721311","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}
{"title":"Construção e Análise de Desempenho de Constelações de Sinais M-PSK em Superfícies Mínimas","authors":"R. Cavalcante, R. Palazzo Jr.","doi":"10.14209/sbrt.2003.665","DOIUrl":"https://doi.org/10.14209/sbrt.2003.665","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"10 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":"125452222","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}
{"title":"Roteamentoe Alocação de Comprimentos de Onda em Redes Ópticas Usando Algoritmo Genético","authors":"M. C. D. Lima, A. F. Araújo, A. César","doi":"10.14209/sbrt.2003.612","DOIUrl":"https://doi.org/10.14209/sbrt.2003.612","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"93 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":"126324681","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}
This work presents a statistical analysis of the transform-domain least-mean-square (TDLMS) algorithm for both stationary and nonstationary environment, resulting in a more accurate model than those discussed in the current open literature. The motivation to analyze such an algorithm comes from the fact that this presents, for correlated signals, a higher convergence speed as compared with other adaptive algorithms that possess a similar computational complexity. Such a fact makes it a highly competitive alternative to applications considering colored input signals. The TDLMS algorithm has an orthogonal transformation stage, providing a separation of the input signal into different frequency bands. The intra-band samples are correlated, being the larger the number of bands, the higher is the correlation. Up to our knowledge, there is no other statistical model of this adaptive algorithm, providing a general and accurate solution, taking into account such correlations. In this way, this work proposes an accurate model allowing for these existing intra-band correlations. Project parameters are obtained from the statistical model, such as upper bound for the step size, optimum step-size value, and algorithm misadjustment. Through numerical simulations, a good agreement between the Monte Carlo method and the predictions from the proposed statistical model is verified for both white and colored Gaussian input signals.
{"title":"Análise Estatística do Algoritmo LMS no Domínio Transformado","authors":"E. Lobato","doi":"10.14209/sbrt.2003.716","DOIUrl":"https://doi.org/10.14209/sbrt.2003.716","url":null,"abstract":"This work presents a statistical analysis of the transform-domain least-mean-square (TDLMS) algorithm for both stationary and nonstationary environment, resulting in a more accurate model than those discussed in the current open literature. The motivation to analyze such an algorithm comes from the fact that this presents, for correlated signals, a higher convergence speed as compared with other adaptive algorithms that possess a similar computational complexity. Such a fact makes it a highly competitive alternative to applications considering colored input signals. The TDLMS algorithm has an orthogonal transformation stage, providing a separation of the input signal into different frequency bands. The intra-band samples are correlated, being the larger the number of bands, the higher is the correlation. Up to our knowledge, there is no other statistical model of this adaptive algorithm, providing a general and accurate solution, taking into account such correlations. In this way, this work proposes an accurate model allowing for these existing intra-band correlations. Project parameters are obtained from the statistical model, such as upper bound for the step size, optimum step-size value, and algorithm misadjustment. Through numerical simulations, a good agreement between the Monte Carlo method and the predictions from the proposed statistical model is verified for both white and colored Gaussian input signals.","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"272 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":"133886085","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}
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