Desenvolvimento de uma interface gráfica para caracterização de desenvolvimento de canais RF.

Abstract

The transmitted signal through modern mobile communication systems may undergo inumerous reflections and refractions along its propagation path between the transmitting and receiving antennas in the urban environment. The resulting signal is then composed of electromagnetic waves that reached the receiving antenna after running various routes. There are, therefore, fluctuations in the intensity of the received signal that can be appropriately modeled by probability distributions like Rayleigh, Nakagami-m, Log-normal, Rice,η − μ and κ − μ. The estimators expressions for the parameters of these distributions were obtained using the method of moments and maximum likelihood method. The expressions are accurate and present good results when the amount of observed samples N is big enough. The validation of the fading model is possible by applying tests of fit like chi-square, Kolmogorov-Sminorv and Anderson-Darling. The developed interface can help researchers and professionals of telecommunications in the statistical characterization of the propagation medium. It allows researchers to enter a mass of data obtained with the spectrum analyzer or the USRP kit from Ettus Research and from these samples trace the histogram and see if the tested models fit to the observed data or not.