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WiMAX Physical Layer
Víteček, Petr ; Prokopec, Jan (referee) ; Miloš, Jiří (advisor)
This thesis deals with 4G communication system WiMAX and his model of physical layer in MATLAB in uplink direction. In individual parts of this thesis we will have closer look on WiMAX, multiple access scheme OFDMA and OFDM modulation. Further, the physical layer signal processing and as last the model of physical layer in MATLAB. Result of this thesis should be model of physical layer , which will be together with model of radio environment used to calculate graphs of BER depending on S/N ratio. The model should show how is BER affected by different parts of model such as used modulation, code rate of FEC code and used type of interleaving.
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WiMAX Network Education Tool
Bláha, Dominik ; Ráb, Jaroslav (referee) ; Ščuglík, František (advisor)
The scope of this thesis are basic principles of WiMAX technology and also the IEEE 802.16 standard. It describes essential techniques speci ed in this standard on physical and also on link layer of ISO/OSI network model. There is also one chapter that gives insight into comparison between LTE and WiMAX 1.5. Another chapter introduces us the situation of WiMAX in the USA, in the Russia and also in the Czech Republic. There is an Flash animation attached that depicts these principles.
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Critical Parameters for Wireless Networks WiFi and WiMAX
Grenar, Milan ; Křepelka, Václav (referee) ; Baroňák, Ivan (referee) ; Filka, Miloslav (advisor)
My thesis will be aimed at problems of wireless networks WiFi and WiMAX. A modelling of network will be put into effect onto which the measurement will be implemented and the impacts of network load on the data transfer Quality of Service (QoS) will be examined with aiming at VoIP. On this network model a power failure will be simulated and the impacts of this failure after restoring the power supply will be monitored. The aim of this thesis is to check the rate of network throughput while preserving a providing service quality and to suggest an economica1ly acceptable solution of the problems relating to feeding tension outage of the access point (AP) for a practical usage in these networks.
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Wireless sensor network
Hruška, Martin ; Burda, Karel (referee) ; Mišurec, Jiří (advisor)
Wireless sensor network (WSN) consist of a mesh of a several powerful devices (denoted as base stations or sink) and a high number (1000 - 1000000) of a low-cost devices (denoted as nodes or motes), which are severely constrained in processing power, memory and energy. The nodes are equipped with an environment sensor. Events recorded by the sensor nodes are locally aggregated and then forwarded to a base station for further processing. WSNs are expected to be in wide use for a multitude of different scenarios. Project target is to analyse possibility of wireless transfer of digitalised data from sensors. Work contains and compares: Wi-Fi, , WiMAX, ZigBee, GPRS, radio net and IrDA. The work will design a wirelless network with data collection from sewerage plant sensors in small rural agglomeration and transfer data to the central dispatching. The work will suggest several options and compare their advantages and disadvantages.
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Data network for smart grid energy
Durkoš, Michal ; Šimek, Milan (referee) ; Mišurec, Jiří (advisor)
Electric grid as we now it has been without significant change for a long time. Along with the human population grows demand for electricity, which leads to need to create more energy. Bigger interest is in ecology and use of renewable sources, although these do not have constant output which often stresses the grid. These problems are to be solved by smart grids. Smart grids are capable of adjusting energy generation to immediate demand including renewable sources to compensate energy fluctuations in grid. They provide demand response and other applications interesting for end users. Smart grids are combination of achievements in energy, informatics and communication technology. Communication, which is key part of smart grids, has to met certain requirements and can be executed by various technologies. There are described various communication technologies and a design concept of data communication in this paper.
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Providing IP mobility in Wi-Fi and Wi-Max environment
Klügl, Richard ; Novotný, Vít (referee) ; Skořepa, Michal (advisor)
The bachelor´s thesis is focused on wireless networks within the context of providing support of IP mobility for these networks. This document consists of two main parts, the theoretical part and the practical part. The first one at the beginning includes simple characteristics and classification of wireless networks. Then it is followed by description of actual new trends in wireless networks, focused on the WiMAX technology (IEEE 802.16). At the end of this part is introduced the technology of mobile IPv4 address provided by the MIPv4 protocol. The second main part of the bachelor´s thesis deals with the practical implementation of the MIPv4 protocol into the Wi-Fi and WiMAX environment. For this object is used the OPNET Modeler 14.0 simulation environment, in which are made three network models of these technologies. This simulation shows function of the basic mechanisms of the MIPv4 protocol and reports which of these models have the best performance for supporting VoIP communication.
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Quality and accessability measurement of GSM network
Vondra, Marek ; Wieser,, Vladimír (referee) ; Hanus, Stanislav (advisor)
The thesis is specialized on a possibility of measuring qualities and availability of a cellular radio system and also on evaluation qualities, fruitfulness interface, permeability etc. It includes short description of a basic mobile technology. Further analysis of the possibility of measuring the mobile network and how implement the measure. It also includes a draft program for measuring and evaluation of the GSM network with help several tests by a mobile phone connected through the Bluetooth.
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Increasing the efficiency of the handover in real network environment
Michalec, Richard ; Sobotka, Jiří (referee) ; Vajsar, Pavel (advisor)
The aim of this work is to study methods of handover used in WiMAX and WLAN networks, next suggest the posibility of simulation methods for WLAN handover in the simulation environment OPNET Modeler. This work is focused primarily on obtaining the information about neighboring AP and subsequent selection of a new AP using such information. The work describes in detail each processes solutions that are used to implement newscanning methods
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Femto cells in next generation mobile networks
Bernkopf, Jan ; Štencel, Vít (referee) ; Hanus, Stanislav (advisor)
This paper provides theoretical analysis of LTE network and Femto cells. Its presents their modulation and transition techniques, their performance and of course implementation of Femto cells into LTE macro-layer. It also describes potential risk of interference between LTE macro-layer and Femto cells and provides the way how to solve and simulate interference. Finally it states simulation and analysis of model situations.
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