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Zálohování dat a datová úložiště
Svoboda, Jan ; Růžička, Zdeněk (oponent) ; Kříž, Jiří (vedoucí práce)
Tato bakalářská práce řeší problematiku zálohování dat a jejich bezpečnost ve společnosti XYZ, jež se zabývá energetikou a automatizací. Výstup bakalářské práce je návrh efektivnějšího řešení zálohovacího systému na základě faktů vyplývajících z analýzy současného stavu.
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Aplikace pro nositelnou elektroniku se systémem Android Wear
Šmejkal, Petr ; Zeman, Kryštof (oponent) ; Hošek, Jiří (vedoucí práce)
Semestrální práce „Aplikace pro nositelnou elektroniku se systémem" Android Wear popisuje základní principy komunikačních sítí - M2M (machine to machine), H2H (human to human) a D2D (device to device). Práce se dále zabývá nositelnými zařízeními, zejména chytrými hodinkami, dostupnými operačními systémy pro chytré hodinky a systémem Android, Android Wear. V praktické části je popsaná funkcionalita, vzhled a struktura vyvinuté aplikace pro Android Wear.
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Interference Optimization in Cellular Communication Systems
Kassem, Edward ; Marchevský, Stanislav (oponent) ; Masopust, Jiří (oponent) ; Blumenstein, Jiří (vedoucí práce)
This thesis is divided into six chapters. The first chapter clarifies the differences between uplink layers of LTE and LTE Advanced systems. It investigates the channel characteristics of device to device (D2D) communication underlaying LTE Advanced network and provides the main key mechanisms of interference management. The structure of Software Defined Radio platform which can be used in channel sounding is also presented. The second chapter evaluates and compares both LTE and LTE Advanced uplink layer performances. Therefore, the structure of previously described LTE Advanced transmitter and receiver with all signal processing stages are implemented in MATLAB. The generated signals of both above mentioned systems are transmitted over different ITU-R channels. Different channel estimation and signal detection techniques to recover the transmitted signal are used. The results are presented in terms of BER and throughput performance curves. The third chapter suggests fractional frequency reuse with three power levels technique to be used as a type of Advanced interference mitigation method. The normalized capacity densities of the cells and their regions with three different cases of user distribution inside the cells are considered. The correlation between the overall capacity and the radius of each region is presented. The achieved results of the proposed scheme are compared with traditional frequency reuse (Reuse-$3$) technique. The fourth chapter provides a research about another method of interference mitigation. The verification of cooperative spectrum sensing methods using four different real channel conditions is conducted. Indoor-indoor, indoor–outdoor, outdoor-indoor, and outdoor-outdoor environments are taken into consideration. The defined system is tested using the Universal Software Radio Peripheral devices. Two types of detectors; the energy detector and the Kolmogorov-Smirnov statistical detector have been implemented at the receiver for signal sensing evaluation. One of the main requirements of D2D communication is a good channel impulse response characteristics knowledge. Therefore, the fifth chapter presents the proposed frequency domain Zadoff-Chu sounding as an alternative technique of channel sounding. Using the proposed method, the basic channel characteristics like RMS delay spread, mean excess delay, path-loss and coherence bandwidth are extracted in ($20$x) shorter time period compared to the continuous wave method. The channel characteristics of an outdoor long range static channel campaign for both ultra-high and super-high frequency bands with co-polarized horizontal and vertical antenna configurations are also investigated. The sixth chapter concludes the thesis.
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Access and Backhaul Solutions for Cellular-Enabled Industrial Wearables
Saafi, Salwa ; Bečvář, Zdeněk (oponent) ; Tölli, Antti (oponent) ; Hošek, Jiří (vedoucí práce)
Smartphones are no longer the only portable devices changing the lives and daily routines of today’s digitally connected consumers. Smart glasses, watches, headsets, cameras, bands, trackers, monitors, and scanners are all examples of hands-free inherently mobile wearable devices that enable the emerging consumer and industrial applications. Similarly to customers who are ready to embrace life-changing experiences with new devices, companies and industries are also employing smart helpers and intelligent assistant systems to improve the efficiency of their automated processes and the productivity and safety of their workers. Not limited to the employment of smart helpers, the industrial digital transformation relies heavily on the deployment of communication infrastructures that utilize efficient cellular technologies to meet the dissimilar requirements of industrial applications. Motivated by these intelligent assistant systems and communication technologies, this dissertation focuses on the role of wearable technology and cellular connectivity in enabling the automation of vertical domains. Aiming to address the current technology gap behind cellular-enabled industrial wearables, the present work is dedicated to assessing the applicability of cellular connectivity to industrial wearables and developing efficient access and backhaul solutions for the support of the requirements of emerging industrial applications. The following outline of this dissertation is built around the main objectives as highlighted above and presents the main outcomes of this work, which include (i) a concise technology review capturing the evolution of the recent solutions proposed by the 3rd Generation Partnership Project (3GPP) for wearable devices and communications, (ii) an introduction to novel categories of industrial wearable applications with mid-end requirements that fall in-between the two extremes of high-end and low-end Fifth-Generation (5G) service classes, (iii) an assessment of the applicability of the emerging Reduced-Capability New Radio (NR RedCap) technology to the newly introduced wearable applications, (iv) an extension of the RedCap wearable communications with Device-to-Device (D2D) and Supplementary Uplink (SUL) capabilities for enhanced access network performance, (v) a cost-efficient backhaul selection solution based on Markov Decision Processes (MDPs) for time-sensitive wearable applications in an integrated terrestrial and non-terrestrial communication scenario, and (vi) a data-driven Artificial Intelligence (AI)-aided approach for the management of complex industrial networks with dissimilar device capabilities, communication solutions, and application requirements. A set of simulation and analytical models is developed to assess the relevant key performance indicators as part of the above contributions. Beyond indicating the need for technology improvement demanded by the efficient integration of wearable devices into cellular networks and the satisfaction of industrial application requirements, the numerical results reported in this dissertation confirm the network performance enhancements achieved by the access and backhaul solutions contributed in this work.
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Zálohování dat a datová úložiště
Svoboda, Jan ; Růžička, Zdeněk (oponent) ; Kříž, Jiří (vedoucí práce)
Tato bakalářská práce řeší problematiku zálohování dat a jejich bezpečnost ve společnosti XYZ, jež se zabývá energetikou a automatizací. Výstup bakalářské práce je návrh efektivnějšího řešení zálohovacího systému na základě faktů vyplývajících z analýzy současného stavu.
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Interference Optimization in Cellular Communication Systems
Kassem, Edward ; Marchevský, Stanislav (oponent) ; Masopust, Jiří (oponent) ; Blumenstein, Jiří (vedoucí práce)
This thesis is divided into six chapters. The first chapter clarifies the differences between uplink layers of LTE and LTE Advanced systems. It investigates the channel characteristics of device to device (D2D) communication underlaying LTE Advanced network and provides the main key mechanisms of interference management. The structure of Software Defined Radio platform which can be used in channel sounding is also presented. The second chapter evaluates and compares both LTE and LTE Advanced uplink layer performances. Therefore, the structure of previously described LTE Advanced transmitter and receiver with all signal processing stages are implemented in MATLAB. The generated signals of both above mentioned systems are transmitted over different ITU-R channels. Different channel estimation and signal detection techniques to recover the transmitted signal are used. The results are presented in terms of BER and throughput performance curves. The third chapter suggests fractional frequency reuse with three power levels technique to be used as a type of Advanced interference mitigation method. The normalized capacity densities of the cells and their regions with three different cases of user distribution inside the cells are considered. The correlation between the overall capacity and the radius of each region is presented. The achieved results of the proposed scheme are compared with traditional frequency reuse (Reuse-$3$) technique. The fourth chapter provides a research about another method of interference mitigation. The verification of cooperative spectrum sensing methods using four different real channel conditions is conducted. Indoor-indoor, indoor–outdoor, outdoor-indoor, and outdoor-outdoor environments are taken into consideration. The defined system is tested using the Universal Software Radio Peripheral devices. Two types of detectors; the energy detector and the Kolmogorov-Smirnov statistical detector have been implemented at the receiver for signal sensing evaluation. One of the main requirements of D2D communication is a good channel impulse response characteristics knowledge. Therefore, the fifth chapter presents the proposed frequency domain Zadoff-Chu sounding as an alternative technique of channel sounding. Using the proposed method, the basic channel characteristics like RMS delay spread, mean excess delay, path-loss and coherence bandwidth are extracted in ($20$x) shorter time period compared to the continuous wave method. The channel characteristics of an outdoor long range static channel campaign for both ultra-high and super-high frequency bands with co-polarized horizontal and vertical antenna configurations are also investigated. The sixth chapter concludes the thesis.
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Aplikace pro nositelnou elektroniku se systémem Android Wear
Šmejkal, Petr ; Zeman, Kryštof (oponent) ; Hošek, Jiří (vedoucí práce)
Semestrální práce „Aplikace pro nositelnou elektroniku se systémem" Android Wear popisuje základní principy komunikačních sítí - M2M (machine to machine), H2H (human to human) a D2D (device to device). Práce se dále zabývá nositelnými zařízeními, zejména chytrými hodinkami, dostupnými operačními systémy pro chytré hodinky a systémem Android, Android Wear. V praktické části je popsaná funkcionalita, vzhled a struktura vyvinuté aplikace pro Android Wear.
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