scholarly journals LoRa Performance under Variable Interference and Heavy-Multipath Conditions

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Kamil Staniec ◽  
Michał Kowal
Keyword(s):  
Communication Systems ◽  
Multipath Propagation ◽  
Spreading Factor ◽  
Reverberation Chamber ◽  
Processing Gain ◽  
Two Factors ◽  
Link Budget ◽  
Harsh Conditions ◽  
The Internet Of Things ◽  
Quantitative Appraisal

LoRa (or LoRaWAN) is by far the best known representative of narrowband communication systems designed for the Internet of Things. As a system dedicated specifically for long-range operations, it possesses a considerable processing gain for the energetic link budget improvement and a remarkable immunity to multipath and interference. The paper describes outcomes of measurement campaigns during which the LoRa performance was tested against these two factors, that is, a heavy-multipath propagation and a controlled, variable interference generated, respectively, in a reverberation chamber and an anechoic chamber. Results allow quantitative appraisal of the system behavior under these harsh conditions with respect to LoRa’s three major configurable parameters: the spreading factor, bandwidth, and code rate. They also allow dividing LoRa configurational space into three distinct sensitivity regions: in the white region it is immune to both interference and multipath propagation, in the light-grey region it is only immune to the multipath phenomenon but sensitive to interference, and in the dark grey region LoRa is vulnerable to both phenomena.

scholarly journals On Vulnerability of Selected IoT Systems to Radio Jamming—A Proposal of Deployment Practices

Sensors ◽  
2020 ◽  
Vol 20 (21) ◽  
pp. 6152 ◽  
Author(s):  
Kamil Staniec ◽  
Michał Kowal
Keyword(s):  
Internet Of Things ◽  
Long Range ◽  
Communication Systems ◽  
Base Station ◽  
Operational Parameters ◽  
Quantitative Expression ◽  
Processing Gain ◽  
Link Budget ◽  
Operational Modes ◽  
Harsh Conditions

Weightless and SigFox are both narrowband communication systems designed for the Internet of Things, along with some other counterparts such as LoRa (Long Range) and narrowband Internet of Things (NB-IoT). As systems dedicated specifically for long-range operations, they possess considerable processing gain for energetic link budget improvement and a remarkable immunity to interference. The paper describes outcomes of a measurement campaign during which the Weightless and SigFox performance was tested against variable interference, generated in an anechoic chamber. Results allow the quantitative appraisal of the system behavior under these harsh conditions with respect to different operational modes of the two investigated IoT systems. The outcomes are then investigated with respect to an intentional radio jammer attempting to block a base station (BS) operation by directly radiating an interfering signal towards it. An Interference Margin is proposed for a quantitative expression of a system’s resilience to jamming. This margin, calculated for all available configuration settings, allows the clear assessment of which combination of a system’s operational parameters does and which does not provide immunity to this type of radio attack.

Fault Tree Analysis for a Modern Communication System

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Kamal Hamid ◽  
Nadim Chahine
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Fault Tree ◽  
Fault Tree Analysis ◽  
Theory And Practice ◽  
Tree Analysis ◽  
Satisfactory Performance ◽  
System Components ◽  
Link Budget ◽  
Simulation Results

Wireless communications became one of the most widespread means for transferring information. Speed and reliability in transferring the piece of information are considered one of the most important requirements in communication systems in general. Moreover, Quality and reliability in any system are considered the most important criterion of the efficiency of this system in doing the task it is designed to do and its ability for satisfactory performance for a certain period of time, Therefore, we need fault tree analysis in these systems in order to determine how to detect an error or defect when happening in communication system and what are the possibilities that make this error happens. This research deals with studying TETRA system components, studying the physical layer in theory and practice, as well as studying fault tree analysis in this system, and later benefit from this study in proposing improvements to the structure of the system, which led to improve gain in Link Budget. A simulation and test have been done using MATLAB, where simulation results have shown that the built fault tree is able to detect the system’s work by 82.4%.

scholarly journals Data Downlink System in the Vast IOT Node Condition Assisted by UAV, Large Intelligent Surface, and Power and Data Beacon

Sensors ◽  
2020 ◽  
Vol 20 (20) ◽  
pp. 5748
Author(s):  
Zhibo Zhang ◽  
Qing Chang ◽  
Na Zhao ◽  
Chen Li ◽  
Tianrun Li
Keyword(s):  
Communication Systems ◽  
Optimization Problems ◽  
Minimum Energy ◽  
Numerical Algorithms ◽  
Flight Trajectory ◽  
Performance Improvements ◽  
Minimum Energy Consumption ◽  
Significant Performance ◽  
Downlink System ◽  
The Internet Of Things

The future development of communication systems will create a great demand for the internet of things (IOT), where the overall control of all IOT nodes will become an important problem. Considering the essential issues of miniaturization and energy conservation, in this study, a new data downlink system is designed in which all IOT nodes harvest energy first and then receive data. To avoid the unsolvable problem of pre-locating all positions of vast IOT nodes, a device called the power and data beacon (PDB) is proposed. This acts as a relay station for energy and data. In addition, we model future scenes in which a communication system is assisted by unmanned aerial vehicles (UAVs), large intelligent surfaces (LISs), and PDBs. In this paper, we propose and solve the problem of determining the optimal flight trajectory to reach the minimum energy consumption or minimum time consumption. Four future feasible scenes are analyzed and then the optimization problems are solved based on numerical algorithms. Simulation results show that there are significant performance improvements in energy/time with the deployment of LISs and reasonable UAV trajectory planning.

scholarly journals Link Budget Analysis for Reconfigurable Smart Surfaces in Aerial Platforms

2020 ◽  
Author(s):  
SAFWAN ALFATTANI ◽  
Wael Jaafar ◽  
Yassine Hmamouche ◽  
Halim Yanikomeroglu ◽  
Abbas Yongacoglu
Keyword(s):  
Communication Systems ◽  
Low Earth Orbit ◽  
Earth Orbit ◽  
Budget Analysis ◽  
Smart Surfaces ◽  
Aerial Vehicle ◽  
Link Budget ◽  
Aerial Platforms ◽  
High Altitude Platform Station ◽  
Aerial Platform

In this paper, we derive the link budget relations for<br>communications assisted by reconfigurable smart surfaces (RSS).<br>Specifically, under specular and scattering paradigms, we provide<br>link budget expressions for an RSS-assisted communication on<br>the ground, where the RSS is either mounted on a building, or on<br>an aerial platform, such as an unmanned aerial vehicle (UAV),<br>a high altitude platform station (HAPS), or a low-earth orbit<br>satellite (LEO). The obtained numerical results provide design<br>guidelines for RSS-assisted communication systems, including the<br>recommended aerial platform to use, the size of RSS for each<br>type of the platforms, and the operating frequencies. <br>

scholarly journals IOT Home Automation

2021 ◽  
Vol 9 (12) ◽  
pp. 1820-1823
Author(s):  
Ranjan Navin
Keyword(s):  
Internet Of Things ◽  
Communication Systems ◽  
Mobile App ◽  
The Internet ◽  
Automation System ◽  
Daily Routine ◽  
Home Automation ◽  
Automation Systems ◽  
Home Automation System ◽  
The Internet Of Things

Abstract: The Internet of Things (IoT) is the most recent technology platform. We may regulate our daily routine work, such as home applications, control, and simple communication systems, using IOT, and improve our digital services. The Internet of Things (IoT) is a system that intelligently adds everyday content information to the internet in order to facilitate communication between objects and humans, as well as among themselves. In this study, we demonstrate how IoT can improve home automation. The relay, Node MCU, which is a network access component, is used in our suggested system. We can control that equipment using an IoT-based system technique. Mobile phones, computers, and tablets are used as user interfaces in home automation systems. They can connect to the home automation network through a wireless internet connection. The user will interact with the system directly via the control interface, while home appliances will be controlled remotely via a mobile app. An additional aspect of the home automation system is that it may be protected remotely. This redesigned design concept provided a home automation system that could be controlled efficiently. Keywords: IOT, home automation, smart home, relay, response time, Node MCU (ESP8266)

scholarly journals A Survey on Optical Technologies for IoT, Smart Industry, and Smart Infrastructures

2019 ◽  
Vol 8 (3) ◽  
pp. 47 ◽  
Author(s):  
Slavisa Aleksic
Keyword(s):  
Communication Systems ◽  
Optical Components ◽  
Smart Systems ◽  
Optical Communication Systems ◽  
Smart Industry ◽  
The One ◽  
Data Acquisition And Processing ◽  
The Internet Of Things ◽  
Heterogeneous Transmission ◽  
Very High

In the Internet of Things (IoT), a huge number of sensors, actuators and other equipment for data acquisition and processing will be interconnected by means of an omnipresent communication network able to efficiently support heterogeneous transmission technologies and applications. On the one hand, advanced optical communication systems, which already play a significant role in modern networks, are currently evolving to meet very high requirements of modern applications. On the other hand, there are already many ways to utilize optical components and effects for building precise, efficient, and reliable sensors. Thus, optical technologies have the potential to greatly help in realizing future smart infrastructures and systems. This paper gives an overview of currently available and emerging optical technologies for sensing and communication applications and reviews their possible application in the context of the IoT for realizing smart systems and infrastructures.

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