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Automatic Detection of a Vessel Mooring at an Anchor Buoy in LPWAN Networks
Kejík, Petr ; Klusáček, Stanislav (referee) ; Kopečný, Lukáš (advisor)
This Master’s thesis deals with the design and construction of a maintenance-free unit for the detection of vessel mooring to an anchor buoy. The unit is powered by a battery with the possibility of running from another alternative source of power, in this particular case a solar panel. For wireless communication, the unit uses LoRa and NB-IoT technologies working in the LPWAN networks. During the designing phase, emphasis is placed on aspects such as maintenance-free duty, minimal consumption and the possibility of mounting on any type of buoy. The thesis also deals with the mechanical design of the device and design of the prototype of the detection element. The work is created in a cooperation with Netlia IoT s.r.o., which mainly deals with the custom production of devices using smart sensors and LPWAN communication technologies.
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Uninterruptible power supply for Robotics
Kejík, Petr ; Ligocki, Adam (referee) ; Burian, František (advisor)
This Bachelor thesis deals with the design and construction of a DC power supply unit with the possibility of battery backup power. The device in intended as an uninterruptible power supply for robotic devices. Thanks to its modularity it can also be used to power other small appliances and it can be easily expanded with more functions. In the designed configuration, the device contains two identical output modules, which together provide four independent power outputs. The power output voltages are adjustable in the range of 3–20 V, with a maximum considered continues current of 6 A. Digital control of modules and monitoring of critical parameters is procured through two Atmel ATmega32U4 microcontrollers placed on separate main board. Configuration and communication with the device it self is done via a local user interface (display and keyboard) and USB port (virtual seriál interface). Main power supply is provided by means of an external commercial DC power source producing voltage in the range of 30–38 V. Backup operation is secured from a 24V lead-acid battery, which is also recharged in normal conditions
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Radio Network LTE Design
Tribula, David ; Kejík, Petr (referee) ; Hanus, Stanislav (advisor)
The diploma thesis deals with the design of the LTE radio part using the ICS Designer program. First, the work describes the signal processing in the physical layer LTE system, for downlink and uplink. Subsequently, it was made simple block diagram. The next part deals with models of signal propagation in the radio environment. The last part is an introduction to the ICS Designer. This section describes the base station design and demonstration of some simulations. The last part is devoted to the design of the mobile network in the given area, its simulation and subsequent comparison with the existing mobile network.
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Signal processing and receiving in UMTS system
Hron, Michal ; Hanus, Stanislav (referee) ; Kejík, Petr (advisor)
This semestral thesis be concerned with datailed analysis of receiving and processing signals in UMTS network system. Insistence of this work is setting to principals of RAKE receiver and processing signals in CDMA networks downlink channel. Through development system MATLAB simulates real function of RAKE receiver. This project is giving fundamental knowledges about receiving and processing of multipath signals to readers.
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Optimization of Access to CDMA Networks
Kejík, Petr ; Masopust, Jiří (referee) ; Wieser, Vladimír (referee) ; Hanus, Stanislav (advisor)
The aim of this dissertation thesis is an optimization of access to CDMA networks. To be more specific, this thesis deals with an optimization of admission control in UMTS network. The first part of the thesis deals with the present progress of the particular topic. Thereinafter there is an analysis of admission control in UMTS system. An own UMTS simulation program was created in MATLAB. This program enables implementation and simulation of the selected admission control algorithms. The thesis is focused on load factor based, fuzzy logic based and genetic algorithms. The created UMTS simulator was used for the mutual comparison of all algorithms. The aims of this thesis are the suitable UMTS model design, evaluation and possible optimization of selected algorithms.
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E-UTRAN Air Interface Description
Opletal, Prokop ; Kejík, Petr (referee) ; Hanus, Stanislav (advisor)
The aim of this bachelor’s thesis was to study a basic principles of wireless system LTE with a view to radio interface. Readers are familiarize with a basic concepts of system within a text, like modulation OFDM, which is principal for LTE technology. Further in text are shortly describe OFDMA and SC-FDMA technologies, which are employ in LTE downlink and uplink. There are also summarize parameters, which radically change a bit rate in LTE systems. In dependence on the theoretic knowledge was designed a model of LTE system in MATLAB. With this model were performed simulations of transmission of LTE signal through the radio channel.
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Simulation of UMTS system
Predajňa, Martin ; Prokopec, Jan (referee) ; Kejík, Petr (advisor)
The bachelor’s thesis deals with modeling of UMTS system in downlink. It is focused on signal processing in physical layer and observes BER depending on parameters of model of real environment by setting different interruption. Basic architecture of UMTS system, channel coding and multiplexing of transport channels to physical channels is described in this thesis. Radio frame structure for downlink dedicated physical data channel is also described there. Using of pseudorandom sequences in CDMA systems and their properties are key parameters for observation of BER. Simulation uses single-user model in basic band, which enables to observe the influence of noise and narrowband jamming. These channel properties have impact on BER, which is used for evaluation of UMTS system. The orthogonality of sequences is influenced by multi access interference so detection of required signal (which uses correlation properties of spreading sequences) is limited.
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Active probes PMS in UMTS-TDD network
Doskočil, Ladislav ; Kejík, Petr (referee) ; Hanus, Stanislav (advisor)
This essay contains basic information about the UMTS system, teach-in with the programming language C++, succinct description of some technologies used by internet, specifically protocol TCP/IP, HTML and PHP language, which relate to this project. Included is also an introduction to databases systems and brief description SQL language and MySQL database system. The last part of this work describes the system design of the Active probes PMS for network monitoring and results of experimental measuring.
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