4,754 research outputs found
Wireless home automation networks for indoor surveillance: technologies and experiments
The use of wireless technologies for critical surveillance and home automation introduces a number of opportunities as well as technological challenges. New emerging technologies give the opportunity to exploit the full potential of the internet of things paradigm by augmenting existing wired installations with smart wireless architectures. This work gives an overview of requirements, characteristics, and challenges of wireless home automation networks with special focus on intrusion detection systems. The proposed wireless network is based on several sensors that are deployed over a monitored area for detecting possible risky situations and triggering appropriate actions in response. The network needs to support critical traffic patterns with different characteristics and quality constraints. Namely, it should provide a periodic low-power monitoring service and, in case of intrusion detection, a real-time alarm propagation mechanism over inherently unreliable wireless links subject to fluctuations of the signal power. Following the guidelines introduced by recent standardization, this paper proposes the design of a wireless network prototype at 868 MHz which is able to satisfy the specifications of typical intrusion detection applications. A proprietary medium access control is developed based on the low-power SimpliciTI radio stack (Texas Instruments Incorporated, San Diego, CA, USA). Network performance is assessed by experimental measurements using a test-bed in an indoor office environment with severe multipath and nonline-of-sight propagation conditions. The measurement campaigns highlight the potential of the sub-GHz technology for cable replacing
FR2 5G Networks for Industrial Scenarios: An Experimental Characterization and Beam Management Procedures in Operational Conditions
Industrial environments constitute a challenge in terms of radio propagation
due to the presence of machinery and the mobility of the different agents,
especially at mmWave bands. This paper presents an experimental evaluation of a
FR2 5G network deployed in an operational factory scenario at 26 GHz. The
experimental characterization, performed with autonomous mobile robots that
self-navigate the industrial lab, leads to the analysis of the received power
along the factory and the evaluation of reference path gain models. The
proposed assessment deeply analyzes the physical layer of the communication
network under operational conditions. Thus, two different network
configurations are assessed by measuring the power received in the entire
factory, providing a comparison between deployments. Additionally, beam
management procedures, such as beam recovery, beam sweeping or beam switching,
are analyzed since they are crucial in environments where mobile agents are
involved. They aim for a zero interruption approach based on reliable
communications. The results analysis shows that beam recovery procedures can
perform a beam switching to an alternative serving beam with power losses of
less than 1.6 dB on average. Beam sweeping analysis demonstrates the prevalence
of the direct component in Line-of-Sight conditions despite the strong
scattering component and large-scale fading in the environment.Comment: 11 pages, 10 figure
Characterizing the UAV-to-Machine UWB Radio Channel in Smart Factories
In this work, the results of Ultra-Wideband air-to-ground measurements carried out in a real-world factory environment are presented and discussed. With intelligent industrial deployments in mind, we envision a scenario where the Unmanned Aerial Vehicle can be used as a supplementary tool for factory operation, optimization and control. Measurements address narrow band and wide band characterization of the wireless radio channel, and can be used for link budget calculation, interference studies and time dispersion assessment in real factories, without the usual limitation for both radio terminals to be close to ground. The measurements are performed at different locations and different heights over the 3.1-5.3 GHz band. Some fundamental propagation parameters values are determined vs. distance, height and propagation conditions. The measurements are complemented with, and compared to, conventional ground-to-ground measurements with the same setup. The conducted measurement campaign gives an insight for realizing wireless applications in smart connected factories, including UAV-assisted applications
28 GHz NLOS Channel Measurements Revealing Low Path Loss and High Angular Spread in Container Ports
This paper presents results from a comprehensive measurement campaign
conducted at 28 GHz inside a container canyon within a commercial port
environment. The measurements are performed at various points inside the
container canyon, considering two types of container stacking and two different
Transmitter (TX) locations, using a narrowband channel sounder equipped with a
rotating horn antenna. The measurements are used to evaluate the azimuthal
spectrum and spatial correlation, as well as the impact of a vehicle inside a
canyon on these parameters. Further, the measurement data is utilized to
validate a simulation setup from which the path loss and the elevation spectrum
inside the canyon is obtained. Lastly, a propagation model inside the canyon is
hypothesized and shown to be consistent with the measurements. The analysis
show a low path loss compared to free space, as well as a high angular spread
and short spatial correlation.Comment: 10 pages, 19 figures. Submitted to Transactions on Antennas and
Propagatio
Experimental Validation and Proof-of-concept of 5G Dense Small Cells Networks in Indoor Environments
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