Starting from outdoor transmission, crossing vegetation, the wideband and narrowband characterization of the indoor mobile radio channel in the 700 MHz band is obtained from experiments carried out in the indoor environment of the Engineering building at Fluminense Federal University, and from the processed data, respectively, the power-delay profiles obtained permitted to calculate the time dispersion parameters and the envelope of the signal permitted to adjust probability density functions to the signal variability, concluding about the influence of vegetation on those characteristics.
Este artigo apresenta o projeto de um amplificador de áudio valvulado (única válvula) de baixo custo. Após a compra dos componentes e desenvolvimento do amplificador foram realizados testes para averiguar a qualidade do áudio produzido. Embora a taxa de distorção harmônica apresentada ser um pouco superior à dos amplificadores comerciais, a queda do custo foi muito significativa, tornando-o uma opção muito interessante no mercado musical.
This work consists in verifying two prediction models applied in outdoor-to-indoor coverage, but now taking in consideration that there is some vegetation between the transmission antenna and the indoor environment and lateral obstacles. Measurements on a 768 MHz carrier were carried out along the corridors, in four floors, inside a building and the models were adjusted to the local mean of the received signal, leading to the conclusion that the multipath has great influence in the received signal levels, presenting a considerable difference in relation to the proposed models.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.