Caracterização espaciotemporal de canais de comunicação sem fio utilizando arranjo de antenas

Abstract

This dissertation deals with the space-time characterization of wireless communication channels using an antenna array. Besides a theoretical approach, the work also suggests a simulation structure in which ultra wideband (UWB) Gaussian monocycle sounding pulses are transmitted through an indoor wireless channel, represented via a combination of the Saleh-Valenzuela and the Spencer models, and received by a linear antenna array. Magnitude, direction of arrival (DOA) and time of arrival (TOA) are them estimated from the received signal for each multipath component, and the results are exported or presented in a three-dimensional graph for analysis. Magnitudes are estimated from an energy detection process, DOA estimation makes use of the MUSIC (multiple signal classi cation) algorithm and TOA estimation uses a recently proposed technique for accurate time interval measurement.