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Experimental measurements and simulations of low-power communication network BUT with long-range
Štrajt, Martin ; Pokorný, Jiří (referee) ; Fujdiak, Radek (advisor)
This work deals with the description, simulation and measurement of coverage of a long-range low-power communications network using LoRaWAN technology. Here is the definition and integration of modern Low Power WAN networks, a brief description of specific technologies and an example of their real use. The theoretical part explains in detail the used modulation, frequency and associated constraints. The practical part contains four simulations of city coverage and simulation of building coverage with description of simulation methods. The last chapter of the measurement describes the description of the measurement methodology, the measuring device, and the graphically presented results of the measurements with their verbal evaluation.
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Efficient security of modern low-power wireless communication technologies
Blažek, Vojtěch ; Malina, Lukáš (referee) ; Fujdiak, Radek (advisor)
This thesis deals with communication security in Sigfox networks. That includes studying the network’s parameters and capabilities and then analysing the appropriate cryptosystems. The thesis contains a description of cryptography as such and a description of cryptosystems that could be implemented in end devices. From the selected cryptosystems, three of the most appropriate are selected based on the required properties, which are put into practice on the Arduino-based development kit and then experimental measurements are made to determine the basic features of the device.
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Design of a programmable attenuator
Pokorný, Rostislav ; Mašek, Pavel (referee) ; Štůsek, Martin (advisor)
This Master´s thesis focuses on design and implementation of programmable attenuator. The main aim of this thesis is to create an electronical device that provide continuous setting of attenuation value in the range between 0–150 dB. Setting a value from the range can be performed using buttons and set values are shown on display. For this thesis an attenuator with working frequency between 0–6 GHz was chosen and four–layer printed circuit board was designed. As a result the device is fitted with an 8bit microcontroller ATmega328P–PU using five 6bit digital attenuators connected in series with manual and program settings of attenuation from 0–157,5 dB with step of 0,5 dB. Data are shown on a build–in display. The application for remote settings and value reading over integrated USB (Universal Serial Bus) interface, was created in C#. In conclusion of this thesis there is a measurement evaluation of attenuation measurement performed on the device.
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Design of smart sensor equipped with LoRa technology
Šigut, Štěpán ; Pokorný, Jiří (referee) ; Štůsek, Martin (advisor)
Over the past years few trends have become as profound in the technology industry as yearly increases in battery capacity, transistor density and price drops for computing power. These trends follow a steep curve and drive what has become known as IoT or Internet of Things. Ever increasing number of devices connected to the internet are putting high demands on wireless network technologies. During the last decade several new wireless technologies have emerged and are competing to become the next go-to technologies for applications such as smart cities, smart cars and smart factories. LoRaWAN is one relatively new competitor to the market and is the central topic of this thesis.
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Implementation and Performance Evaluation of the LoRaWAN Communication Technology Utilizing the NS-3
Bahna, Martin ; Možný, Radek (referee) ; Mašek, Pavel (advisor)
The diploma thesis deals with an implementation of the LoRaWAN wireless network within the NS-3 simulation environment. The thesis defines IoT in general, together with its technologies and types of communication between devices. Subsequently, the LPWAN technology is outlined, as well as its requirements and protocols that are most widely used with this technology. The thesis then describes the LoRaWAN technology in detail, its layers, network architecture and security. The practical part of this thesis sheds some light on the NS-3 simulation environment and the most suitable LoRaWAN module that was selected from the available ones. The chosen module is described in detail and imported to the NS-3 simulation environment. Two simulation scenarios are then performed. The first scenario is focused on the impact created by increasing the number of end devices in the network. The second scenario is focused on the impact created by increasing the distance between the end device and the gateway. The results of the simulations are recorded in the tables which are then used to display the given results in graphs. Last chapter deals with module modification where new frequency bands are implemented and theoretical setup of duplex and encrypted communication is described.
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Battery life analysis for IoT modules
Nikolic, Predrag ; Štůsek, Martin (referee) ; Burget, Radim (advisor)
The main gol of the bakalar thesis is to measure battery lifetime for IoT modules. The teoretical part describes the characteristics of IoT communication modules and battery sources designed for these devices. The practical part contains a program for calculating the battery source life on the IoT module. Current consumption has to be tested by oscilloscope. Measured data is used for recalculation of the actual current consumption. The second practical part of the thises deals with battery source simulation in the working environment. This simulation is used to approximate all the parameters of the environment that directly or indirectly affect the life of the battery source.
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Field sensor network for microclimatological measurements
Juráň, Radovan ; Frýza, Tomáš (referee) ; Povalač, Aleš (advisor)
Tato práce je zaměřena na návrh terénní bezdrátové senzorové sítě pro mikroklimatologická měření, zejména výronů juvenilního oxidu uhličitho v oblasti hydrotermílního krasu, založené na LoRaWAN. V teoretické části práce je předložen přehled cílové oblasti, možností řešení měření, získávání a přenosu dat. Praktická část se pak věnuje kompletnímu návrhu celého systému, to znamená od měřicího zařízení přes koncentrátor a gateway až po backend odesílání dat do cloudového úložiště. Výsledky tohoto komplexního problému jsou prezentovány průběžně a přílohy obsahují detailnější a názornější ukázky.
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Recognition of security issues in LPWA type networks
Shestopalov, Artur ; Pospíšil, Jan (referee) ; Pospíšil, Ondřej (advisor)
The bachelor’s thesis deals with the issue of recognizing security incidents in LPWA (LowPower Wide Area) networks. Thesis contains information about the most used LPWA technologies, examines their security architecture and possible threats. Part of the work is a detailed description of LoRaWAN protocols, including architecture, possible attacks, distinguishing security architecture in the new and old versions. Work contains implementation of two security incident scenarios and their subsequent detection: jamming and gateway disconnection. As part of the detection, was created a web application that is able to detect real-time security incidents based on the average value of RSSI (Received Signal Strength Indicator) and the expected time of message transmission.
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Detection of anomalies in LoRaWAN type of wireless networks
Bahna, Martin ; Možný, Radek (referee) ; Pospíšil, Ondřej (advisor)
The present bachelor thesis deals with the LoRaWAN wireless network’s security. First, IoT is defined in general, together with its technology, its standards and relevant communication protocols. Subsequently, the LPWAN technology is outlined, as well as its requirements and protocols that are most widely used with this technology. The thesis then describes the LoRaWAN technology further, with the focus maintained on its security. Following the security analysis, the most common attacks are mentioned, and possible security incident scenarios are recounted. The practical part of this thesis sheds some light on the process of personal construction of the LoRaWAN network, together with component selection and configuration. Two attacks are then performed on the network, carried out in accordance with the given scenarios. Lastly, a method of detecting these attacks is proposed and explained.
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Design of a current data logger for LPWA sensors
Mikulášek, Michal ; Možný, Radek (referee) ; Štůsek, Martin (advisor)
This Master thesis deals with the design and construction of a measuring device for measuring and the current consumption logging of sensors using LPWAN (Low Power Wide Area Network) technology. The theoretical part of the thesis firstly summarizes selected LPWAN technologies. Selected technologies, namely: LoRaWAN, Sigfox and Narrowband IoT (NB-IoT), are described more in detail. Further, the current measurement techniques are briefly discussed. The main focus is given to the current shunt measuring methods. The second half of thesis describes procedures conducted during the design and construction of a measuring device. The current measuring is based on the current shunt circuit complemented by the voltage amplification circuit, whose output is subsquently converted into digital form using an AD converter. The thesis describes in great detail the procedures for selecting individual components and important processes used in design of printed circuit boards. An integral part of the measuring device implementation is the design and implementation of control software, which is described in detail and supplemented by workflow charts underlining the entire description. The implementation of the entire measuring device is completed by the design and implementation of the cover box using 3D printing technology. Finally, the specifications of designed device are briefly discussed based on the limits of the used components.
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