Buscar
Mostrando ítems 31-40 de 165
Algebraic lattices via polynomial rings
(2019-12-01)
Signal constellations having lattice structure have been studied as meaningful means for signal transmission over Gaussian channel. Usually the problem of finding good signal constellations for a Gaussian channel is ...
Dual-antenna dual-band high performance cubesat-compatible GPS receiver
(Institute of Electrical and Electronics Engineers, 2020-03-21)
Nanosatellites are revolutionizing the space industry allowing low-cost educational, scientific or commercial space missions. Among them, the CubeSats play a key role due to their standardization and increasingly use. As ...
E8-lattice via the cyclotomic field Q(ξ24)
(2018-01-01)
Lattices can be applied in different areas of research, particularly, they can be applied in information theory and encryption schemes. Signal constellations having lattice structure have been used as a support for signal ...
Análise da codificação wavelet em sistemas de rádio com acesso dinâmico ao espectro
(BrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA ELÉTRICA E DE COMPUTAÇÃO, 2017-01-27)
In mobile communications systems, signals propagate over multipaths over time-varying
channels, subject to distortion caused by fading and Doppler shifts. In order to minimize
such distortions, coding techniques and ...
Modulação de sinal GNSS focado ao Sistema Europeu Galileo
(Universidade Federal de Santa MariaBrasilUFSMCentro de Tecnologia, 2019-06-17)
The Global Navigation Satellite System (GNSS) aims to determine the accurate geolocation of a receiver, using a set of signal from the satellites, which transmitted signals vary the modulation according to the constellation. ...
Constelações do poeta negro: imagens de Adão Ventura no arquivo literário
(Universidade Federal de Minas GeraisUFMG, 2017-08-08)
This study "CONSTELLATIONS OF THE BLACK POET: images of Adão Ventura in the literary archive" aims at studying the images of Afro-Brazilian poet Adão Ventura born in Santo Antônio do Itambé, Minas Gerais formed by three ...
Influência do acréscimo de satélites glonass sobre a qualidade de coordenadas estimadas com satélites GPS em local de difícil rastreio
(Universidade Federal de Santa MariaBrasilUFSMCentro de Ciências Rurais, 2008-11-11)
From estimate coordinates point through the use of GPS satellites constellation, located in difficult tracing GPS signs place, by means of using coordinated procedures of transport with the use of receiving devices with ...