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Symbol-rate Baseband Signal Model for RF Pulse-Width Modulation Transmitters
(Institute of Electrical and Electronics Engineers, 2021-06)
Aiming to shed light on the operation of fully-digital transmitters, we present the first symbol-rate baseband model that makes explicit the inter-symbol interference introduced by the RF pulse-width modulation (RF-PWM). ...
Baseband model for uniformly sampled RF-PWM
(Institute of Electrical and Electronics Engineers, 2020-03-12)
A baseband model for a polar RF modulator based on uniform sampling (US) pulse width modulation (PWM) is presented. RF-PWM allows to encode a complex baseband signal (amplitude and phase) into the pulse width and pulse ...
High-altitude resolution stratospheric measurements with the arecibo 430-MHz radar
(American Geophysical Union, 1980-03)
The potential of the Arecibo 430-MHz radar for the study of stratospheric dynamics and turbulence has been recently established. In the past the instrumented resolution of the system has been larger than 300-600 m. The ...
Fluidized bed photoreactors using composites of titania CVD-coated onto quartz sand as photocatalyst: Assessment of photochemical efficiency
(Elsevier Science Sa, 2006-12)
The photochemical efficiency of a fluidized bed (FB) of quartz sand coated with TiO2 by plasma-CVD, was investigated using a fully illuminated, parallel planar photoreactor. The local volumetric rate of photon absorption ...
Impact of the NGF Maturation and Degradation Pathway on the Cortical Cholinergic System Phenotype
(Society for Neuroscience, 2012-02)
Cortical cholinergic atrophy plays a significant role in the cognitive loss seen with aging and in Alzheimer's disease (AD), but the mechanisms leading to it remain unresolved. Nerve growth factor (NGF) is the neurotrophin ...
Arquitetura de hardware multicanal reconfigurável com excitação multinível para desenvolvimento e testes de novos métodos de geração de imagens por ultrassom
(Universidade Tecnológica Federal do ParanáCuritibaPrograma de Pós-Graduação em Engenharia Elétrica e Informática Industrial, 2013-10-08)
Medical ultrasound (US) scanners are amongst the most sophisticated signal processing machines in use today. Even with the recent advances in electronic technology, their typical architecture is often “closed” and does not ...