Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42834
Djalma Carvalho Filho, M. Alencar
—This article describes base station placement as a multi-objective problem (MOP). Base station placement and con-figuration envolves a large number of unknowns and constraints and heuristic algorithms seem to be a suitable alternative to solve MOPs. A new class of evolutionary algorithms, the so-called multi-objective optimisation algorithms based on artificial immune systems (MO-AIS) are the core of an innovative approach to base station placement, which is presented in this paper. Preliminary results followed by a thorough analysis are provided. Three network simulation environments are used in the tests.
{"title":"Otimização da Localização de Estações Radiobase Baseada em Sistemas Imunológicos Artificiais","authors":"Djalma Carvalho Filho, M. Alencar","doi":"10.14209/sbrt.2008.42834","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42834","url":null,"abstract":"—This article describes base station placement as a multi-objective problem (MOP). Base station placement and con-figuration envolves a large number of unknowns and constraints and heuristic algorithms seem to be a suitable alternative to solve MOPs. A new class of evolutionary algorithms, the so-called multi-objective optimisation algorithms based on artificial immune systems (MO-AIS) are the core of an innovative approach to base station placement, which is presented in this paper. Preliminary results followed by a thorough analysis are provided. Three network simulation environments are used in the tests.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI 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":"129929722","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42727
T. Fonseca, R. Queiroz
— H.264/AVC is a hybrid predictive-transform coder. In this paper we propose a more computational efficient approach to implement the prediction module, its most complex stage. The idea is to employ a subset of dominant prediction modes instead of testing all modes recommended by H.264/AVC standard. Results show that, for high definition sequences, the quality loss is negligible allowing us to control the compression complexity of high definition digital TV video sequences.
{"title":"Complexity Reduction Techniques Applied to The Compression of High Definition Sequences in Digital TV","authors":"T. Fonseca, R. Queiroz","doi":"10.14209/sbrt.2008.42727","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42727","url":null,"abstract":"— H.264/AVC is a hybrid predictive-transform coder. In this paper we propose a more computational efficient approach to implement the prediction module, its most complex stage. The idea is to employ a subset of dominant prediction modes instead of testing all modes recommended by H.264/AVC standard. Results show that, for high definition sequences, the quality loss is negligible allowing us to control the compression complexity of high definition digital TV video sequences.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI 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":"117199722","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42502
A. Shinoda, L. C. T. D. Albuquerque
—The objective of this work is to show an alternative approach for the channel assignment in cellular system using ge-netic algorithm (GA), parallel processing and signal-interference ratio (SIR) with time limitation to get a channel set, based on cost function or interference, to attend the demand of calls on the system.
{"title":"Alocação de Canais em Sistemas de Comunicação Celular Empregando Algoritmo Genético Distribuído e SIR com Temporização","authors":"A. Shinoda, L. C. T. D. Albuquerque","doi":"10.14209/sbrt.2008.42502","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42502","url":null,"abstract":"—The objective of this work is to show an alternative approach for the channel assignment in cellular system using ge-netic algorithm (GA), parallel processing and signal-interference ratio (SIR) with time limitation to get a channel set, based on cost function or interference, to attend the demand of calls on the system.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"44 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":"123043047","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42832
Vinícius Lima, A. Castro, João Costa, J. Riu, Klas Ericson
—The automatic interpretation of reflectometry traces to identify twisted-pair loops can be considered a pattern recognition problem. Thus, any loop make-up algorithm must firstly extract features from the reflectogram before starting a classification process. This paper focuses on feature extraction through the echo identification on time domain reflectometry (TDR) measurements, which are analyzed by a multi-scale edge detection wavelet approach that identifies all singularities in a reflectogram and relate them to theirs respective echoes. From echoes, it is provided an approximation for an auto-regressive TDR trace model, furnishing features for classification.
{"title":"Wavelet-based Echo Identification in Time Domain Reflectograms","authors":"Vinícius Lima, A. Castro, João Costa, J. Riu, Klas Ericson","doi":"10.14209/sbrt.2008.42832","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42832","url":null,"abstract":"—The automatic interpretation of reflectometry traces to identify twisted-pair loops can be considered a pattern recognition problem. Thus, any loop make-up algorithm must firstly extract features from the reflectogram before starting a classification process. This paper focuses on feature extraction through the echo identification on time domain reflectometry (TDR) measurements, which are analyzed by a multi-scale edge detection wavelet approach that identifies all singularities in a reflectogram and relate them to theirs respective echoes. From echoes, it is provided an approximation for an auto-regressive TDR trace model, furnishing features for classification.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"146 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":"132608720","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42784
S. Chagas, Eber Huanca Cayo, J. L. Bordim
— The performance of WDM networks are usually analized through the blocking probability of a given request. It is argued that alternative routes can have a significant impact on the blocking probability of a WDM network. In this work, we analize the impact of alternative routes in mesh and ring topologies. Results show that, contrary to our expectation, having alternative routes can have a negative impact in certain cases .
{"title":"Análise de Desempenho de Algoritmos de Roteamento e Alocação de Comprimentos de Onda em Redes WDM","authors":"S. Chagas, Eber Huanca Cayo, J. L. Bordim","doi":"10.14209/sbrt.2008.42784","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42784","url":null,"abstract":"— The performance of WDM networks are usually analized through the blocking probability of a given request. It is argued that alternative routes can have a significant impact on the blocking probability of a WDM network. In this work, we analize the impact of alternative routes in mesh and ring topologies. Results show that, contrary to our expectation, having alternative routes can have a negative impact in certain cases .","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"9 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":"126888886","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42520
Diogo C. Soriano, Everton Z. Nadalin, C. Wada, Rafael Ferrari, R. Suyama, Romis Attux
— This work proposes a blind strategy for adapting the parameters of a decision-feedback equalizer (DFE). The approach, which is based on the constant modulus (CM) criterion and on an artificial immune system, was tested under scenarios characterized by channels representative of a number of aspects relevant from a practical standpoint. In all cases, it was possible to find the global optimum of the CM criterion with a number of iterations considered by us to be quite reasonable in view of, inter alia , the complexity of the employed search tool.
{"title":"Equalização Cega com Realimentação de Decisões Baseada em Redes Imunológicas Artificiais","authors":"Diogo C. Soriano, Everton Z. Nadalin, C. Wada, Rafael Ferrari, R. Suyama, Romis Attux","doi":"10.14209/sbrt.2008.42520","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42520","url":null,"abstract":"— This work proposes a blind strategy for adapting the parameters of a decision-feedback equalizer (DFE). The approach, which is based on the constant modulus (CM) criterion and on an artificial immune system, was tested under scenarios characterized by channels representative of a number of aspects relevant from a practical standpoint. In all cases, it was possible to find the global optimum of the CM criterion with a number of iterations considered by us to be quite reasonable in view of, inter alia , the complexity of the employed search tool.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"18 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":"126669731","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42722
J. B. Lima, R. Souza, Hélio M. de Oliveira
This paper presents an extension of the arithmetic Fourier transform which allows to perform the spectral analysis of a discrete-time signal in arbitrary frequencies. The pro- posed procedure, which is related to the nonuniform discrete Fourier transform, has attractive characteristics in terms of computational complexity. Results of simulations and application scenarios are discussed.
{"title":"Um Algoritmo Aritmético para Análise Espectral Não-Uniforme","authors":"J. B. Lima, R. Souza, Hélio M. de Oliveira","doi":"10.14209/sbrt.2008.42722","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42722","url":null,"abstract":"This paper presents an extension of the arithmetic Fourier transform which allows to perform the spectral analysis of a discrete-time signal in arbitrary frequencies. The pro- posed procedure, which is related to the nonuniform discrete Fourier transform, has attractive characteristics in terms of computational complexity. Results of simulations and application scenarios are discussed.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"50 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":"116902937","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.43119
F. Barros, E. Costa, G. L. Siqueira
This paper presents the results from an ultra wideband (UWB) indoor measurement campaign and describes a 3D beam trace pyramidal method that allows one to characterize the channel over a bandwidth of 850 MHz. The UWB channel characteristics are assessed in terms of mean delay, delay spread and coherence bandwidth.
{"title":"Ultra Wideband Indoor Radio Propagation Channel Analysis Using a 3-D Beam Tracing Method - Preliminary Results","authors":"F. Barros, E. Costa, G. L. Siqueira","doi":"10.14209/sbrt.2008.43119","DOIUrl":"https://doi.org/10.14209/sbrt.2008.43119","url":null,"abstract":"This paper presents the results from an ultra wideband (UWB) indoor measurement campaign and describes a 3D beam trace pyramidal method that allows one to characterize the channel over a bandwidth of 850 MHz. The UWB channel characteristics are assessed in terms of mean delay, delay spread and coherence bandwidth.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"116 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":"114560901","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42851
Eduardo Yabcznski, E. Wille, H. D. S. Lopes
This article is concerned with the dimensioning of IP networks when submitted to TCP traffic. The problem taken into account is the Discrete Capacity Assignment where capacity values for each network link are chosen based on a set of discrete values. Three techniques are proposed to deal with it: Exaustive Search (ES), Particle Swarm Optimization (PSO) and a restriction based heuristic. Keywords— Dimensioning of IP networks, Discrete Capacity Assignment, Exaustive Search, Particle Swarm Optimization.
{"title":"Algoritmos para Solução do Problema de Atribuição de Capacidades Discretas em Redes TCP/IP","authors":"Eduardo Yabcznski, E. Wille, H. D. S. Lopes","doi":"10.14209/sbrt.2008.42851","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42851","url":null,"abstract":"This article is concerned with the dimensioning of IP networks when submitted to TCP traffic. The problem taken into account is the Discrete Capacity Assignment where capacity values for each network link are chosen based on a set of discrete values. Three techniques are proposed to deal with it: Exaustive Search (ES), Particle Swarm Optimization (PSO) and a restriction based heuristic. Keywords— Dimensioning of IP networks, Discrete Capacity Assignment, Exaustive Search, Particle Swarm Optimization.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"74 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":"114880482","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}
Pub Date : 1900-01-01DOI: 10.14209/sbrt.2008.42576
Demóstenes Zegarra Rodríguez, M. Ramírez
Resumo - Perda de pacotes e atrasos influenciam na qualidade de uma conversa interativa em uma rede IP. Este artigo mostra uma metodologia para predizer o comportamento de diferentes codificadores, utilizando modelo s objetivos como o PESQ e a Recomendacao E-Model do ITU-T. A metodologia apresentada e util para medir a performance de novos codificadores, ou de codificadores que ainda nao possuam parâmetros definidos em diferentes cenarios de perda de pacotes e atrasos, em uma comunicacao bidirecional utilizando uma rede emulada com open source software, sendo o cenario facilmente reproduzido.
{"title":"Determinação do comportamento de codificadores em diferentes condições de rede em um cenário experimental","authors":"Demóstenes Zegarra Rodríguez, M. Ramírez","doi":"10.14209/sbrt.2008.42576","DOIUrl":"https://doi.org/10.14209/sbrt.2008.42576","url":null,"abstract":"Resumo - Perda de pacotes e atrasos influenciam na qualidade de uma conversa interativa em uma rede IP. Este artigo mostra uma metodologia para predizer o comportamento de diferentes codificadores, utilizando modelo s objetivos como o PESQ e a Recomendacao E-Model do ITU-T. A metodologia apresentada e util para medir a performance de novos codificadores, ou de codificadores que ainda nao possuam parâmetros definidos em diferentes cenarios de perda de pacotes e atrasos, em uma comunicacao bidirecional utilizando uma rede emulada com open source software, sendo o cenario facilmente reproduzido.","PeriodicalId":340055,"journal":{"name":"Anais do XXVI Simpósio Brasileiro de Telecomunicações","volume":"149 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":"121564913","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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