Interference Cancellation
Mostrando 1-12 de 13 artigos, teses e dissertações.
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1. Executive demands of the Tower of London task in Brazilian teenagers
Some executive tasks may require diverse abilities to solve, having implications for the comprehension of an individual's performance. This study investigated the processes involved in the resolution of a complex test of executive function (EF): the Tower of London (ToL) task. One hundred twenty-four healthy teenagers, 11-14 years old (M = 12.5, SD = 1.14) p
Psychol. Neurosci.. Publicado em: 2012-06
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2. Desenvolvimento de funções executivas em crianças sem domínio da linguagem escrita e relação com desatenção e hiperatividade / Development of executive functions in children without written language and relationship with inattention and hyperactivity
Executive functions refer to the skills needed to plan, initiate, implement and monitor intentional conduct related to an objective or environmental demands and allows to the subject guide behaviors to as objetive. Include inhibition, working memory, cognitive flexibility, selective attention, planning and organization. Executive functions develop during chi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/08/2011
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3. Um estudo sobre a robustez de técnicas de processamento de sinais em sistemas MIMO / A study regarding robustness of signal processing techniques in MIMO systems
Multiple antenna wireless communication systems achieve high data transmission rates and good robustness to channel fading when signals traveling through the system are jointly processed in their transmitters and/ or receivers. In general, signal detection techniques assume perfect knowledge of the channel state information, in both transmitter and receiver,
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/06/2011
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4. Modelagem de redes CDMA-PON baseadas em técnicas de cancelamento paralelo e códigos corretores de erros / Modeling of CDMA-PON networks using parallel interference cancellation and error correcting codes techniques
The advent of new services offered to end users, such as the so called triple play, which consists in the simultaneous traffic of voice, video, and data through the same communication infrastructure, has been pushing telecom operators towards providing adequate bandwidth as well as quality of service. This has brought the spotlight to passive optical network
Publicado em: 2009
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5. Effect of the dot-dot interaction strength on the conductance of side-connected quantum dots
The conductance of two interacting dots connected to leads is studied. The configuration is such that one dot is embedded into the leads while the other is tunneling-coupled only to the first dot. The effect of the tunneling interaction strength on the conductance is discussed. As the two dot levels cross the Fermi level the low temperature conductance of th
Brazilian Journal of Physics. Publicado em: 2006-09
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6. Um estudo do aumento da capacidade de sistemas 3g WCDMA usando técnicas 3.5G de expansão do enlace reverso
A introdução de novos serviços digitais nas redes celulares, em taxas de transmissão cada vez mais elevadas, tem impulsionado recentes pesquisas que vêm estudando maneiras de aumentar a capacidade de transmissão de dados e diminuir os atrasos nos enlaces direto e reverso de sistemas de terceira geração WCDMA. Esses estudos têm resultado em novos pad
Publicado em: 2005
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7. Inclusive photoproduction of lepton pairs in the parton model
In the framework of the QCD parton model, we study unpolarized scattering of high energy real photons from a proton target into lepton pairs and a system of hadrons. For a given parametrization of parton distributions in the proton, we calculate the cross section of this process and show the cancellation of the interference terms.
Brazilian Journal of Physics. Publicado em: 2004-09
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8. Coulomb nuclear interference with deuterons in even palladium isotopes
Angular distributions for the inelastic scattering of 13.0 MeV deuterons on 104;106;108;110Pd were measured with the Sao Paulo Pelletron-Enge-Spectrograph facility in the range of 12(0) < thetalab < 64(0). A Coulomb-Nuclear Interference analysis, employing the Distorted Wave Born Approximation with the Deformed Optical Model as transition potential, under we
Brazilian Journal of Physics. Publicado em: 2004-09
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9. STRUCTURES AND ALGORITHMS FOR MULTIUSER DETECTION AND INTERFERENCE SUPRESSION IN DS-CDMA SYSTEMS / ESTRUTURAS E ALGORITMOS PARA DETECÇÃO MULTIUSUÁRIO E SUPRESSÃO DE INTERFERÊNCIA EM SISTEMAS DS-CDMA
This thesis presents new structures and algorithms for multiuser detection and interference suppression in DS-CDMA systems. Structures based on recurrent neural networks are investigated for decision feedback receivers and adaptive algorithms are developed for combatting multiple access interference and intersymbol interference. New algorithms based on the m
Publicado em: 2004
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10. Espectroscopia Ãptica nÃo linear em sistemas atÃmicos envolvendo nÃveis de Rydberg
In this thesis we study nonlinear optical effects in alkali vapors, in which Rydberg levels play the role of near resonant intermediate levels, focusing our attention in processes such as: four wave mixing (FWM), two photon absorption, sum frequency generation (SF) and difference frequency generation (DF). We analyze a FWM process with two-photon transitions
Publicado em: 2002
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11. Um sistema FH-CDMA com cancelamento de interferencia e codigos corretores de erro
This work presents a study of interference cancellation for a FH-CDMA system. At first, the performances of two interference cancellation algorithms proposed by Timor and Fiebig are compared for a channel with noise and frequency selective fading. Timor s algorithm, which makes use of the algebraic structure of the users addresses, showed a better tradeoff b
Publicado em: 1999
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12. Processamento adaptativo para cancelamento da interferencia de polarização cruzada em sistemas radio digitais
A interesting approach to improve the spectral efficiency of a digital radio system is the utilization the frequency reuse technique. However due to of the propagation impairments, there exist mutual interference between these two orthogonal channels, known as cross polarization interference. This work studies the interference cancellation by means of adapti
Publicado em: 1991