Fixed Telephony
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Green-Markov models - new optimization strategies: a case study for user allocation in co-channel macro/femto networks
The femtocell concept aims to combine fixed-line broadband access with mobile telephony using the deployment of low-cost, low-power third and fourth generation base stations in the subscribers' homes. While the self-configuration of femtocells is a plus, it can limit the quality of service (QoS) for the users and reduce the efficiency of the network, based o
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2012-12
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2. A regulação dos serviços públicos de telecomunicações no Brasil e o novo serviço público
The telecommunications sector is strategic for a country that aims to the economic and social development, considering that, besides being in itself an important industry, can leverage the growth of other sectors o the economy, with its technological solutions. The current model of telecoms regulation emerged in the context of the New Public Management, from
Publicado em: 2010
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3. Privatização e processo decisório
This article examines the political determinants of privatization of the fixed telephony sector in four countries, based on a neo-institutionalist approach. These countries faced similar pressures by telephone companies in favor of privatization, suggesting an apparent convergence in the sector's reorganization. However, although all four adopted some degree
Dados. Publicado em: 2009-06
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4. Compression of electromygraphic signals using adaptive predictive multi-rate codec / Compressão de sinais eletromiográficos usando codificador multitaxa preditivo adaptativo
The development of highly efficient speech codecs has raised the interest in their use in other types of signal, such as electrophysiological ones. This study evaluates the AMRACELP codec, developed for third generation mobile telephony, and proposes changes to improve its performance in compression of electromyographical signals, considering the objective q
Publicado em: 2009
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5. A Influência da Regulamentação na Formação do Mercado de Telecom no Brasil.
In the late two decades, the telecommunications sector passed through great transformations. On the one hand, the advent of the microelectronics base has provoked a technological revolution in the telecommunications industry, which resulted in new services, new transmission and switching equipment and the convergence with others segments of the electronic co
Publicado em: 2009
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6. Usability study of mobile phones / Estudo de usabilidade em telefones celulares
lt is happening a fast convergence of technologies regarding mobile phones. The first mobile phone generation was developed to satisfy the users to make and receive calls similarly to fixed phones. However, new functionalities such as messaging, multimedia, internet connection, sound player, video, camera, Bluetooth are being added into these devices, which
Publicado em: 2006
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7. A Análise da Teledensidade como Contribuição ao Entendimento dos Fatores Estratégicos à Sustentabilidade Das Empresas Concessionárias de Telefonia Fixa Brasileiras / The Teledensity Analysis as Contribuition to the Agreement of the Strategic Factors for the Sustentation of the Companies Concessionaries of Fixed Brazilian Telephony.
This dissertation deals with the dynamic environment regarding the Brazilian residential telephone service established since its privatization, in 1997. The territorial division made by players with distinct strategies, all followed by a strict federal law, and the existence of a regulation organ for telecom services (ANATEL) contributed for the continuous e
Publicado em: 2006
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8. Conflict-resolution organizatinal competences and the consensus on the strategic decision-making process in dynamic, complex and non-munificent organizational environments: a study in the fixed-voice telephony segment / As competências organizacionais de resolução de conflitos e o consenso no processo decisório estratégico em ambientes organizacionais instáveis, complexos e não munificientes: um estudo no setor de telefonia fixa
A presente pesquisa visou levantar dados que permitissem aprofundar o entendimento sobre as habilidades organizacionais de resolução de conflitos e sua relação com o consenso entre os gestores no processo decisório estratégico de organizações inseridas em ambientes organizacionais dinâmicos, complexos e não munificentes (DCM-). Desenvolveu-se, para
Publicado em: 2006
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9. Externalidade de rede e a telefonia fixa-móvel: um estudo sobre o poder de mercado da telefonia móvel e a demanda por serviços de telecomunicações
This piece of work develops a theoretical model of the fixed-mobile telephony market, trying to analyze the characteristic of consumers externality (network externality) existent in the network industries, as well as the specific phenomenon of bottleneck in that market, in which the cellulars firms have certain domain over their costumers. This market power
Publicado em: 2005
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10. Selection algorithm of spreading sequences for CDMA systems with space-time coding and antenna array / Algoritmo de escolha de sequencias de espalhamento em sistemas CDMA com codificação espaço-temporal e arranjo de antenas
The performance of mobile communication systems based on the CDMA technique is limited by interference. In this thesis, we propose a selection algorithm of spreading sequences with fixed length for interference mitigation on CDMA systems over frequency-selective fading channels, that is based on the minimization of the overall mean bit error probability of t
Publicado em: 2005
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11. THE DIFFUSION OF MOBILE TELEPHONY IN BRASIL: AN EMPIRICAL INVESTIGATION / A DIFUSÃO DA TELEFONIA CELULAR NO BRASIL: UMA INVESTIGAÇÃO EMPÍRICA
Since its appearance in Brasil, in 1990, the mobile phones showed a remarkably fast expansion, exceeding the number of fixed phones in 2003 and reaching 54 million of active subscribers in the middle of 2004. This dissertation analyses the process of diffusion of mobile telephony in Brasil and its objectives are (a) to understand how this process happened an
Publicado em: 2004
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12. POST-PRIVATIZATION COMPETITIVE STRATEGIES FOR FIXED TELEPHONY SWITCHED SERVICES (STFC) CONCESSIONAIRE COMPANIES IN BRAZIL: A CASE STUDY / ESTRATÉGIAS COMPETITIVAS PÓS-PRIVATIZAÇÃO PARA AS EMPRESAS CONCESSIONÁRIAS DE SERVIÇO TELEFÔNICO FIXO COMUTADO (STFC) NO BRASIL: UM ESTUDO DE CASO
A indústria de telecomunicações no Brasil vem passando por profundas transformações desde meados da década de 1990, quando da alteração da regulamentação e da privatização do monopólio estatal prestador de serviço telefônico fixo comutado (STFC). No arcabouço regulatório da indústria, estas alterações implicaram em grandes transformaçõe
Publicado em: 2004