(cid:151)The ef(cid:2)cient separation of signals is a frequent problem in multi-user communications systems. Space-time blind equalization techniques have been studied as a possible solu- tion. The Accelerated Constant Modulus algorithm was recently proposed as a blind equalization technique for combating inter- symbol interference in single-user systems. It is based on a tuner used in adaptive control that adjusts the second derivative of the coef(cid:2)cient estimates and minimizes the cost function introduced by Godard. In this paper, we extend this algorithm for blind separation and equalization of multiple users in the presence of inter-symbol interference. Through simulations, we show that the proposed algorithm outperforms the well-known MU-CM (Multi-user Constant Modulus) algorithm at the cost of introducing a moderate increase in computational complexity.
{"title":"Um Algoritmo do Módulo Constante Acelerado para Equalização Espaço-temporal","authors":"Madson T. Silva, M. Gerken, M. Miranda","doi":"10.14209/sbrt.2003.491","DOIUrl":"https://doi.org/10.14209/sbrt.2003.491","url":null,"abstract":"(cid:151)The ef(cid:2)cient separation of signals is a frequent problem in multi-user communications systems. Space-time blind equalization techniques have been studied as a possible solu- tion. The Accelerated Constant Modulus algorithm was recently proposed as a blind equalization technique for combating inter- symbol interference in single-user systems. It is based on a tuner used in adaptive control that adjusts the second derivative of the coef(cid:2)cient estimates and minimizes the cost function introduced by Godard. In this paper, we extend this algorithm for blind separation and equalization of multiple users in the presence of inter-symbol interference. Through simulations, we show that the proposed algorithm outperforms the well-known MU-CM (Multi-user Constant Modulus) algorithm at the cost of introducing a moderate increase in computational complexity.","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"48 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":"132762075","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":"Uso de Sonda de Canal de Propagação Faixa-larga para Estimar Ângulos-de-chegada, pela Técnica de Arranjo por Abertura Sintética","authors":"M. C. Dias, G. L. Siqueira","doi":"10.14209/sbrt.2003.744","DOIUrl":"https://doi.org/10.14209/sbrt.2003.744","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"17 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":"134394320","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}
—A asynchronous unicellular DS-CDMA system is modeled considering a slow fading frequency selective multipath mobile radio channel. The system performance is evaluated in bit error rate terms analyzing the benefices which derives from decorrelator implementation and path diversity. Finally, it verifies the superiority in performance at condition of identical numbers of fingers and of paths.
{"title":"Descorrelacionador Aliado à Diversidade de Percursos","authors":"E. M. G. Stancanelli, T. Abrão, P. Jeszensky","doi":"10.14209/sbrt.2003.437","DOIUrl":"https://doi.org/10.14209/sbrt.2003.437","url":null,"abstract":"—A asynchronous unicellular DS-CDMA system is modeled considering a slow fading frequency selective multipath mobile radio channel. The system performance is evaluated in bit error rate terms analyzing the benefices which derives from decorrelator implementation and path diversity. Finally, it verifies the superiority in performance at condition of identical numbers of fingers and of paths.","PeriodicalId":325953,"journal":{"name":"Anais do XX 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":"129848027","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":"Sistema de Inserção Multiplicativa de Marca D'água Usando Espalhamento Espectral","authors":"R. A. Silva, J. Mayer","doi":"10.14209/sbrt.2003.257","DOIUrl":"https://doi.org/10.14209/sbrt.2003.257","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"14 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":"132071985","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 Nova Abordagem para Estimação de Probabilidades de Bloqueio em Redes de Roteamentode Comprimento de Onda Lineares","authors":"H. Waldman, D. Campelo, R. C. Almeida Jr","doi":"10.14209/sbrt.2003.622","DOIUrl":"https://doi.org/10.14209/sbrt.2003.622","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"169 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":"133395360","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 Ferramenta para Análise de Antenas Impressas em Estruturas Multicamadas","authors":"R. Moreano, M. Bonadiman, J. Lacava","doi":"10.14209/sbrt.2003.407","DOIUrl":"https://doi.org/10.14209/sbrt.2003.407","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"23 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":"130241529","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":"Nova Estrutura de Adaptação de Taxa de Transmissão para uma Arquitetura de Serviços Diferenciados Escalável","authors":"C. Santos, L. Ling","doi":"10.14209/sbrt.2003.196","DOIUrl":"https://doi.org/10.14209/sbrt.2003.196","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"6 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":"131356482","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}
M. D. Souza, Hélio M. de Oliveira, R. Souza, M. M. Vasconcelos
Uma nova transformada, a transformada discreta do seno sobre um corpo finito (TDSCF) é introduzida. O núcleo da TDSCF é a função trigonométrica seno definida sobre um corpo finito. A TDSCF tem comprimentos que são divisores de (p + 1)/2. Um caso especial é a TDSCF de Mersenne, definida quando p é um primo de Mersenne. Essa classe de TDSCFs tem comprimentos que são potências de 2 e podem ser computadas por algoritmos FFT de base 2.
{"title":"A Transformada Discreta do Cosseno em um Corpo Finito","authors":"M. D. Souza, Hélio M. de Oliveira, R. Souza, M. M. Vasconcelos","doi":"10.14209/sbrt.2003.699","DOIUrl":"https://doi.org/10.14209/sbrt.2003.699","url":null,"abstract":"Uma nova transformada, a transformada discreta do seno sobre um corpo finito (TDSCF) é introduzida. O núcleo da TDSCF é a função trigonométrica seno definida sobre um corpo finito. A TDSCF tem comprimentos que são divisores de (p + 1)/2. Um caso especial é a TDSCF de Mersenne, definida quando p é um primo de Mersenne. Essa classe de TDSCFs tem comprimentos que são potências de 2 e podem ser computadas por algoritmos FFT de base 2.","PeriodicalId":325953,"journal":{"name":"Anais do XX 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":"116306290","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":"Metodologia de Otimização de Amplificadores de Potência em RF via Estratégia Evolucionária Multi-objetivos","authors":"L. Brito, P. D. Carvalho","doi":"10.14209/sbrt.2003.547","DOIUrl":"https://doi.org/10.14209/sbrt.2003.547","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"38 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":"128080673","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 Abordagem de Alocação de Banda Efetiva para Tráfego MPEG-4 sobre Redes ATM Utilizando Processos TES","authors":"J. Borges, L. Ling","doi":"10.14209/sbrt.2003.570","DOIUrl":"https://doi.org/10.14209/sbrt.2003.570","url":null,"abstract":"","PeriodicalId":325953,"journal":{"name":"Anais do XX Simpósio Brasileiro de Telecomunicações","volume":"235 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":"133769574","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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