With the constant evolution of technology and communication systems, the
increase in data exchange, speed and reliability regarding access to the mobile network
has reinforced. Several causes such as spectral deficiency, difficulties in signal
coverage, problems with antennas and radio link, are obstacles to be worked on and
improved in order to provide services with higher quality within a mobile communication
network infrastructure.
To meet the vertiginous increase in the consumption of users and equipment
connected to the mobile network, several works and researches are being proposed
and developed. In Brazil, the arrival of fifth generation technology (5G) is expected
from 2021, which will use the frequency band of 3.5 GHz. 5G promises fast connectivity
with more users covering services and applications that demand high data
rates over a wide coverage area. In particular, on this frequency that represents a
sub-6 GHz band to be used for 5G in Brazil. As for the behavior of the channel,
the characterization of this channel is of important relevance. Thus, in this dissertation,
the study on channel analysis for the frequency of 3.5 GHz in a large indoor
environment was motivated, this scenario is in a lobby of the International Airport
Val de Cans, in Belém do Pará. measurements were performed for Line-Of-Sight
(LOS) and through channel probing the dispersion parameters of the small-scale
channel are extracted. These parameters are the average RMS delay and average
RMS spread, the channel coherence band and the power profile and delays were also
verified.
Understanding large-scale signal propagation is important for designing mobile
radio systems. The signal was also investigated through the Floating-Intercept
(FI), Close-In (CI) models and their variations are applied and analyzed to evaluate
the path loss for co-polarization (V-V and H-H) and cross-polarization (V-H and
H-V ). It can be inferred that the methodology applied on a large scale proved to
be adequate with the data and, when compared to other types of environments and
other frequencies found in the literature.
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