Research Article Large-Scale Channel Modeling and Measurements for 10GHz in Indoor Environments Iury S. Batalha , Andréia V. R. Lopes, Jasmine P. L. Araújo, Fabrício J. B. Barros, Bruno L. S. Castro, Gervásio P. S. Cavalcante, and Evaldo G. Pelaes LCT, UFPA, Belem 66045-110, Brazil Correspondence should be addressed to Iury S. Batalha; iurybatalha@gmail.com Received 31 August 2018; Accepted 11 November 2018; Published 23 January 2019 Guest Editor: Peter Excell Copyright © 2019 Iury S. Batalha et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. With the advent of 5G mobile communication and researches into the propagation of large-scale channel modeling for frequencies above 6 GHz, measurement investigation was performed at 10 GHz with horn-type directional antennas in a corridor and a computer room within the Electrical and Computer Engineering Laboratories’ first floor, at Federal University of Pará (UFPA), Brazil. This paper presents data obtained through experimental work, channel modeling with co-polarization V-V and H-H and cross-polarization V-H in line-of-sight (LOS) or non-line-of-sight (NLOS) conditions. The large-scale close-in reference is sustained by a comprehensive analysis, considering propagation mechanisms such as reflection and diffraction. Results demonstrate that the established model had inferior standard deviation in relation to measured data, proving itself more significant to propagation in indoor environments. 1. Introduction The considerable quantity of bandwidth available in frequency bands above 6 GHz is an attractive resource to provide multi-Gigabit per second (Gbps) data rates. Such resource would alleviate the traffic flow of mobile data in lower frequency bands, such as those below 6 GHz [1, 2]. With the advent of the new generation of mobile commu- nication (5G), there is a great deal of research taking place into the development to provide recommendations. One of its branches of study lies within the millimetric waves, resulting in works above 6 GHz [3–6]. Frequencies within 3 to 30 GHz (SHF: Super High Frequency) and 30 to 300 (EHF: Extremely High Frequency) bands present similar propagation characteristics, classifying them as millimetric wave (mmWave) bands [4, 5]. Therefore, it is fundamental to know the mmWave channel’s propagation characteristics for the development of fifth generation mobile and wireless communication systems—5G [7]. These channel propagation characteristics can be defined through path loss models, in large scale, that predict the propagation signal’s attenuation according to distance. They are important for developing more efficient communication systems, to optimize the positioning of transmitting antennas and assist on future telecommunication system projects [8]. For indoor environments, there are several structural questions that influence signal behavior, such as construc- tion materials utilized in the building, size of buildin- g/rooms/corridors, number of people circulating inside the room, furniture types and placement, and interference with other systems. They confine the waves within the environ- ment, leading to more reflective components and multiple paths for the signal to propagate, as well as crossing of walls (diffraction) and other types of obstacles [9]. A wireless system requires extensive research and com- prehension of its propagation channels. Even though a large number of investigations have been undertaken into chan- nels below 6 GHz, there are campaigns aiming at measuring and modeling of 5G channels at 10 to 28 GHz and 30 to 72 GHz bands [5, 10–15], presented by institutes such as New York University (NYU) and the Mobile and Wireless Community Enablers for the Twenty-Twenty Information Society (METIS)—the former created with the sole purpose to standardize 5G systems [16, 17]. The METIS report Hindawi International Journal of Antennas and Propagation Volume 2019, Article ID 9454271, 10 pages https://doi.org/10.1155/2019/9454271