Allocation Of Channels
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Controle dos efeitos da mistura de quatro ondas (FWM) para melhoria no gerenciamento do QoS óptico em redes GMPLS/DWDM. / Control of the four wave mixing (FWM) effects for improvement in the optical QOS management in GMPLS /DWDM networks.
This work investigates the effects of the Four-Wave Mixing (FWM) during the lightpaths establishment in a GMPLS/DWDM (Generalized Multiprotocol Label Switching / Dense Wavelength Division Multiplexing) network. In order to minimize their impacts and thus reduce network blocking, strategies based on RSVP-TE (Resource Reservation Protocol- Traffic Engineering)
Publicado em: 2011
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2. Evaluation of a linear spectral mixture model and vegetation indices (NDVI and EVI) in a study of schistosomiasis mansoni and Biomphalaria glabrata distribution in the state of Minas Gerais, Brazil
This paper analyses the associations between Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI) on the prevalence of schistosomiasis and the presence of Biomphalaria glabrata in the state of Minas Gerais (MG), Brazil. Additionally, vegetation, soil and shade fraction images were created using a Linear Spectral Mixture Model (LS
Memórias do Instituto Oswaldo Cruz. Publicado em: 2010-07
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3. Uma Contribuicão a Estimação de Canais PLC Variantes no Tempo utilizando Sinais Pilotos
In this dissertation is discussed and analyzed the performance of pilot-assisted channel estimation techniques for OFDM (Orthogonal Frequency Division Multiplexing) modulation that is applied to data transmission through PLC (power line communications) channels. The PLC channels are modeled as linear and time-invariant (LIT), linear and time variant (LTV), a
Publicado em: 2009
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4. Desenvolvimento de sistema de monitoramento de produção avicola utilizando rede de sensores sem fio / Development of monitoring system of poultry production using wireless sensor network
It is increasingly necessary to optimize the agricultural production due to environmental or economic pressures imposed by global markets. Aiming at increasing the efficiency of agricultural production come the need to exert greater control in the procedures adopted, especially in poultry barns. The development of control and monitoring systems based on Wire
Publicado em: 2008
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5. Power allocation in wireless communication systems : stochastic via CVaR and robust approaches / Alocação de potencia em sistemas de comunicações sem fio : abordagens estocastica via o CVaR e robusta
This thesis deals with the power allocation problem under the stochastic and robust approaches, where the channel gains describe the wireless communication system state and are partially known by the controller. The stochastic approach considers the channel gains as random variables which represent the fast fading of the radio signal. Under these settings, t
Publicado em: 2007
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6. Application of artificial intelligence techniques for dynamic channel allocation on wireless networks. / Aplicação de técnicas de inteligência artificial na alocação dinâmica de canais em redes sem fio.
In the last years, mobile networks became more important for communication systems infrastructure. One area of great growth is mobile computation, which is performed through radio signals. The amount of available channels rarely is enough to attend the increasing demand. This work presents a solution for the channel allocation topic, a challenging topic in
Publicado em: 2006
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7. TÃcnicas de otimizaÃÃo da produÃÃo para reservatÃrios de petrÃleo: abordagens sem uso de derivadas para alocaÃÃo dinÃmica das vazÃes de produÃÃo e injeÃÃo
Petroleum Engineering daily activities are faced with a series of situations that call for optimal solutions in dierent contexts. At all phases of Oil &Gas industryâs workflow, it is possible to find out problems which need optimization, in larger or smaller scale, with more or less complexity. In reservoir engineering, there exists great in
Publicado em: 2006
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8. Indexação de objetos móveis : uma estratégia para garantir a alocação dinâmica de canais em redes celulares
In cellular networks, communication among mobile devices is accomplished through base stations (fixed antennas). A base station allocates communication channels whenever a mobile device (a cell phone, for example) in its coverage area requests communication with some other device (mobile or fixed). With the rapidly growing number of mobile devices, the use o
Publicado em: 2005
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9. APLICAÇÃO CONJUNTA DE CONTROLE DE POTÊNCIA E ALOCAÇÃO DINÂMICA DE CANAIS A SISTEMAS MÓVEIS CELULARES / JOINT POWER CONTROL AND CHANNEL ALOCATIN IN CELLULAR WIRELESS SYSTEMS
This work investigates the behavior if three channel allocation schemes for Mobile Cellular Systems, when associated to three different automatic uplink power control schemes. The two objectives sought with this association are improved capacity over the isoladed use of the allocation schemes, and a better distribuition of the Signal to Interference Ratio (S
Publicado em: 1997
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10. STUDY ON SPEECH CODING IN SUB-BANDS AT 16 KBITS/S / ESTUDO DE CODIFICAÇÃO DE VOZ EM SUB-BANDAS A 16 KBIT/S
In this thesis a study of 16 kbit/s sub-band coding of speech signals is presented. The encoding systems are examined in terms of the number of sub-bands, the schemes used to encode the sub-band signals, the parameters and techniques employed in the quantizers adaptation and the type of bit allocation. Spectral decomposition of the input signal is carried ou
Publicado em: 1986