Caracterização de canal em banda estreita nas faixas de 900 MHz e 2,4 GHz em áreas de vivência com predominância de vegetação para projetos de parques digitais

Abstract

Due to the constant search for improvement for the design of modern communication systems, there is a greater need to study the parameters that allow characterizing the mobile radio channel. In this sense, many studies have been carried out, however, little has been done in areas with predominance of vegetation where it is essential that wireless communication systems, or IEEE 802.11, are designed, as in the case of digital films, which have been increasingly found in major urban centers and surroundings. Thus, the present work, search, characterizes the loss of channel propagation through prediction models Weissberger, COST-23, ITUR and FITUR anticipated in areas with vegetation predominance, analyzing these models in a comparison with some empirical models. already known urban areas in the 900MHz and 2.4GHz bands, through two band measurement campaigns initiated on the campus of the Pontifical Catholic University of Rio de Janeiro - PUC in Rio de Janeiro. The obtained results reveal the empirical models used, or those that presented better adherence to the experimental data found, were those of Okumura-Hata for suburban regions. The models used for areas with vegetation predominance show good agreement, with the FITUR model showing the latest data values at 900MHz and the Weissberger model showing the best adherence to the data collected at 2.4GHZ. It was possible, using collected data, to calculate the values of the decay constant with distance (d) according to the variations and to verify the results shown after the agreement with other research results in this area, validating the importance of this research for the network systems. wireless in environments with strong presence of vegetation. Also, what is the area of greatest vegetation concentration of the campus of PUC, where it is performed as measurements, as the study environment for simulation of signal propagation in digital films that has as common resources most of these environments in Brazilian cities.