Empirical characterization of the indoor radio channel for array antenna systems in the 3 to 4 GHz frequency band

Concerning the design and planning of new radio interfaces for the fifth-generation (5G) systems, this paper presents a useful contribution to the characterization of the wideband indoor radio channel in the 3-4-GHz frequency band. A measurement campaign has been carried out in two different indoor scenarios to analyze some of the most important wideband parameters of the propagation channel, including a thorough analysis of its behavior to meet the new radio technology challenges. The channel measurement setup consists of a virtual vertical uniform array at the receiver side of the link that remains at a fixed position, whereas the transmitter side, which is equipped with a single antenna, is placed at different positions in the environment under analysis. The measurement setup emulates the up-link of a multi-user multiple-input multiple-output (MIMO) system and allows obtaining the broadband parameters of the multiple channels that are established between the transmitter and each one of the antennas of the receiver array. The results and conclusions about the path loss, temporal dispersion, and coherence bandwidth are included, along with an analysis of the spatial correlation between wideband channels when one of the antennas is an array.This work was supported by the Spanish Ministerio de Economía, Industria y Competitividad under Project TEC2017-86779-C2-1-R and Project TEC2017-86779-C2-2-R

On the applicability of ray-tracing propagation models to V2V-intersection environments

In this work, we analyze the applicability of a geometric-based stochastic (GBS) model based on ray-tracing techniques to vehicular-to-vehicular (V2V) intersections. The accuracy and usefulness of the proposed model is analyzed using simulated results and narrowband channel measurements at 5.9 GHz. The results show that these type of models can be a good choice to evaluate communications protocols and system performance of future vehicular networks

Empirical characterisation of the indoor multi-user MIMO channel in the 3.5 GHz band

This study presents an analysis of the capabilities of using multi-user multiple input multiple output (MU-MIMO) in indoor environments at the 3-4 GHz band through an empirical characterisation of the MU-MIMO channel, obtaining a statistical description of the degree to which this specific multi-user channel verifies the condition of favourable propagation. Different metrics have been considered to measure the degree of orthogonality between the channels, such as the orthogonality coefficient or the condition number. In addition, in order to obtain a direct measure of the goodness of the channel in terms of the achievable spectral efficiency, the capacity of the channel has been calculated for different numbers of users and base station antennas and compared with theoretical i.i.d. Rayleigh channels.This work has been supported by the Spanish Ministerio de Economía, Industria y Competitividad under the projects TEC2017-86779-C2-1-R and TEC2017-86779-C2-2-R

Materiales multimedia en el ámbito científico-tecnológico del programa de diversificación curricular

Se ha pretendido caracterizar las necesidades educativas del colectivo de alumnos y alumnas del Programa de Diversificación Curricular, con el objetivo último de orientar la práctica didáctica y el desarrollo de medidas educativas que supongan respuestas válidas a las necesidades educativas planteadas. Entre estas medidas, independientemente de las más generales de organización general y de refuerzo educativo, se encontrarían las de adaptación, diseño, elaboración y validación de materiales curriculares que supongan en la práctica la utilización de tecnologías informáticas como refuerzo complementario para el Ámbito Científico-Tecnológico de dicho Programa de Diversificación Curricular.Junta de Andalucía. Consejería de EducaciónAndalucíaIES Los Boliches; Calle Frascuelo, sin número; 29640 Fuengirola (Málaga); Tel. +34951269910; Fax +34951269907; [email protected]