Adaptive Arrays
Mostrando 1-12 de 22 artigos, teses e dissertações.
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1. Innate and adaptive immunity gene expression of human keratinocytes cultured of severe burn injury
PURPOSE: Evaluate the expression profile of genes related to Innate and Adaptive Immune System (IAIS) of human Primary Epidermal keratinocytes (hPEKP) of patients with severe burns. METHODS: After obtaining viable fragments of skin with and without burning, culture hKEP was initiated by the enzymatic method using Dispase (Sigma-Aldrich). These cells were tr
Acta Cir. Bras.. Publicado em: 2014
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2. Optimized microlens-array geometry for Hartmann-Shack wavefront sensor: design, fabrication and test
The Hartmann-Shack (H-S) wavefront sensor is now deployed in many different fields, from astronomy to industrial inspection, where the quality of optical media or components can be measured by the distortions (wavefront aberrations) they impart on a wavefront transmitted or reflected by them. In ophthalmology, this sensor is a core component of major aberrom
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/02/2012
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3. A transparent and energy aware reconfigurable multiprocessor platform for efficient ILP and TLP exploitation
As the number of embedded applications is increasing, the current strategy of several companies is to launch a new platform within short periods, to execute the application set more efficiently, with low energy consumption. However, for each new platform deployment, new tool chains must come along, with additional libraries, debuggers and compilers. This str
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2012
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4. Controlador adaptativo backstepping a estrutura variável
In this work, a Variable Structure Adaptive Backstepping Controller (VS-ABC) for monovariable, linear time invariant plants with relative degree one is presented. Instead of traditional integral adaptive laws for estimating the plant parameters, switching laws are used to increase robustness to parametric uncertainties and disturbances, as well as, to improv
Publicado em: 2008
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5. Modelos de prediÃÃo linear para anÃlise de sinais eletroencefalogrÃficos (EEG) e de matrizes multieletrodo (MEA) / Linear-prediction models for electroencephalographic (EEG) and multielectrode-array (MEA) signal analysis
This work establishes models of neurophysiological signals, which are composed of spontaneous activity measurements taken by means of multielectrode arrays (MEAs) applied on in vitro cell cultures; as well as of neurological signals based on electroencephalography. These models suppose that MEAs are employed as neuroprostheses applied for detection and forec
Publicado em: 2006
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6. Estimação de dados em ambiente CDMA usando o conformador de Feixes Bayesiano / CDMA data estimation using the bayesian beamformer
The increasing demand for mobile communications services without a corresponding increase in spectrum allocation has motivated the development of new techniques to improve spectrum utilization. The Code Division Multiple Access (CDMA) and adaptive antenna array are two approaches that show real promise for increasing spectrum efficiency. Initially, a study a
Publicado em: 2006
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7. Efeitos de acoplamento e de banda de operação em redes de antenas adaptativas reais. / Coupling and operation bandwidth effects in real adaptive antenna arrays.
Smart antenna arrays are becoming more important in the expansion and in the enhancement of cellular telephony systems, specially in the third-generation that will need an even larger bandwidth. In this subject, many contributions from the scientific community have been provided with the goal of determining direction-of-arrival for incident signals, eliminat
Publicado em: 2005
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8. Aplicações de antenas inteligentes e equalização concorrente em sistemas WCDMA/HSDPA / Applications of smart antennas and concurrent equalization on WCDMA/HSDPA systems
This dissertation investigates and proposes different algorithms for smart antennas and channel equalization aiming at WCDMA HSDPA downlink receivers. Considering the channel equalization issue, we propose an adaptive back-propagation algorithm with concurrent sub-systems. This equalization technique exploits particular characteristics of a WCDMA downlink si
Publicado em: 2004
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9. Estudo do efeito de dipolos em arranjos de antenas adaptativas de sistemas de comunicação DS-CDMA
This master dissertation introduces a study about some aspects that determine the aplication of adaptative arrays in DS-CDMA cellular systems. Some basics concepts and your evolution in the time about celular systems was detailed here, meanly the CDMA tecnique, specialy about spread-codes and funtionaly principies. Since this, the mobile radio enviroment, wi
Publicado em: 2003
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10. Estudo do efeito de dipolos em arranjos de antenas adaptativas de sistemas de comunicação DS-CDMA
This master dissertation introduces a study about some aspects that determine the aplication of adaptative arrays in DS-CDMA cellular systems. Some basics concepts and your evolution in the time about celular systems was detailed here, meanly the CDMA tecnique, specialy about spread-codes and funtionaly principies. Since this, the mobile radio enviroment, wi
Publicado em: 2003
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11. UTIZACIÓN DE ANTENAS ADAPTATIVAS EN SISTEMAS CDMA / UTILIZAÇÃO DE ANTENAS ADAPTATIVAS EM SISTEMAS CDMA / USE OF ADAPTIVE ARRAYS IN CDMA SYSTEMS
Este trabalho tem como objetivo avaliar alguns aspectos da utilização de antenas adaptativas em um sistema celular digital CDMA. Uma das razões para isto é que as antenas adaptativas reduzem a interferência que no sistema CDMA influencia direta e fortemente a capacidade do sistema. Inicialmente foi feito um resumo dos princípios gerais dos arranjos de
Publicado em: 2001
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12. Filtragem adaptativa com restrições lineares por minimos quadrados
The basic problem of linear constrained filtering consists In searching ao optimal filter whose parameters are subject to a set of linear equations. For transversal structures, the optimal coefficients In the mean-square sense are given by the Wlener-Hopf equations. The introduction of constraints leads to a modified solution, obtained by the Lagrange multip
Publicado em: 1991