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Measurement of the 802.11n standard properties
Halm, Martin ; Šebela, Radek (referee) ; Prokopec, Jan (advisor)
This bachelor’s thesis is bent on peruse standard 802.11n and inquest diversity from standard 802.11b, g. Standard 802.11b was, first used for wireless net „WLAN”. This standard was extensive standard 802.11g that the has bigger temporary carrier rate. This acceleration is incurred modulation OFDM. Next successor after these standards is standard 802.11n.
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Modulations in PLC systems
Procházka, Vít ; Kouřil, Jiří (referee) ; Krajsa, Ondřej (advisor)
The bachelor thesis describes principles and methods of Powerline Communications, practical usage possibilities both in industrial applications but mainly in broadband systems that may represent promising competition to conventional broadband access, e. g. xDSL connections without the need of new wiring, WIFI etc. The thesis also focuses on problems that can occur in the communication channel from the view of electromagnetic compatibility and assorted interferences. The 50 Hz frequency electric network (60 Hz in the USA) was not designed for data signal transmission, problems may arise mainly at higher frequencies and broadband communication. It is necessary to implement methods which enable transfer of information signal through a communication channel with minimalization of problems such as interference, cable attenuation, electromagnetic compatibility, bit error rate (BER), etc. Furthermore, currently used modulation principles and their characteristics are described, such as spread spectrum modulation DSSS, FHSS, traditional OFDM, alternative modulations FMT and DWMT with filter banks. The last chapter of the bachelor thesis features models of particular modulations created in the Matlab-Simulink program and the conclusion presents advantages and disadvantages of their implementation in PLC systems.
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Minimizing the effect of interference on wireless network
Doležal, Jan ; Kyselák, Martin (referee) ; Škorpil, Vladislav (advisor)
This thesis is concerned the technology with technologies of transfer through wireless devices. It is about possibilities of optimization of transfer in wireless net, especially of the reduction of interference influence. The first part is about theory and the standards development of wireless technology. There are methods and principles used in wireless technologies. The second part is a practical measuring and testing of an internal wireless net, with the emphasis being on the source of interference influence. Measuring was focused on interference between access points and was not about meteorological influence. It continues with theory and testing of interference of the microwave oven in our wireless net. Then, it is a practical demonstration of interference in an external environment. There are practical examples of interference between different providers’ nets on the same area and solutions to prevent or to cancel this interference. In next part of work the wireless net is parsed and described in a given territory. Here is described the way how to precede the reciprocal interference and eventually how this mutual disturbance suppress. Consequently, our net is optimized for customer growth and for today’s options of newer and more powerful components for wireless transfer. Finally there are two laboratory tasks. The first one is about practical measuring and testing of wireless net’s parameters and the second one is about simulation of wireless networks in the Opnet program.
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Prevention of development of functional vertebragenous disorders among powerlifter community
ČERNOTA, Pavel
This bachelor's thesis deals with the options of prevention of development of functional vertebragenous disorders among the powerliftting community. The main purpose of this thesis was to propose a model of a therapy focusing on prevention of development of functional vertebragenous disorders, that remain one of the most common form of injury among powerlifters. Another purpose of this thesis was to examine the efficiency of this therapy by comparing the results gathered during the preand post-therapy assessment. The theoretical part of this thesis deals with spinal anatomy and mechanics. It also discusses the formation of functional disorders, the concept of the potential of the functional capacity, and compares the importance of mobility and stability. The empirical part of my work uses the qualitative research method. Three different subjects were examined and based on the initial assessment, a 4-week-long individual therapy was recommended. The therapy used the concepts from kinesiotherapy and some elements of the manual medicine. The therapy was successful in improving the function of the deep stabilisation spine system and joint mobility. However, the thesis couldn't provide evidence, whether the therapy had positive effect for prevention of the development of functional vertebragenous disorders.
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Influence of pilates method on the stabilizing system of the spine
Šašková, Vlasta ; Bunc, Václav (advisor) ; Hošková, Blanka (referee)
Title: Influence of pilates method on the stabilizing system of the spine Objectives: The main aim of this diploma thesis was to confirm or refute the claim that a six-week motion program using the pilates method positively affects the stabilizing system of the spine. The partial aims of the work were to determine whether the a six-week motion program using the pilates method had a positive effect on the posture, spinal mobility, shortened muscles and standing stabilization. Methods: As a method of research, a case study was selected involving two adult persons (males). The motion program was preceded by an initial examination. In particular, static examination of the standing position, dynamic examination of standing position (flexion, extension, lateroflexion), examination of stabilization (Véle test, stand on 1 LL, standing on 2 scales), examinations of spinal distances (Schober's, Otto's and Čepojev's distance, lateroflexion), goniometry of rotation of thoracic and lumbar spine, examination of shortened muscles according to Janda (hip flexors, knee flexors, pectoralis major and minor, m.trapezius and paravertebral muscles) examination of postural stabilization by Kolář (extension test, trunk flexion test, diaphragm test, hip flexion test). Participants then underwent a six-week motion program...
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Measurement of the 802.11n standard properties
Halm, Martin ; Šebela, Radek (referee) ; Prokopec, Jan (advisor)
This bachelor’s thesis is bent on peruse standard 802.11n and inquest diversity from standard 802.11b, g. Standard 802.11b was, first used for wireless net „WLAN”. This standard was extensive standard 802.11g that the has bigger temporary carrier rate. This acceleration is incurred modulation OFDM. Next successor after these standards is standard 802.11n.
|
|
|
Modulations in PLC systems
Procházka, Vít ; Kouřil, Jiří (referee) ; Krajsa, Ondřej (advisor)
The bachelor thesis describes principles and methods of Powerline Communications, practical usage possibilities both in industrial applications but mainly in broadband systems that may represent promising competition to conventional broadband access, e. g. xDSL connections without the need of new wiring, WIFI etc. The thesis also focuses on problems that can occur in the communication channel from the view of electromagnetic compatibility and assorted interferences. The 50 Hz frequency electric network (60 Hz in the USA) was not designed for data signal transmission, problems may arise mainly at higher frequencies and broadband communication. It is necessary to implement methods which enable transfer of information signal through a communication channel with minimalization of problems such as interference, cable attenuation, electromagnetic compatibility, bit error rate (BER), etc. Furthermore, currently used modulation principles and their characteristics are described, such as spread spectrum modulation DSSS, FHSS, traditional OFDM, alternative modulations FMT and DWMT with filter banks. The last chapter of the bachelor thesis features models of particular modulations created in the Matlab-Simulink program and the conclusion presents advantages and disadvantages of their implementation in PLC systems.
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Minimizing the effect of interference on wireless network
Doležal, Jan ; Kyselák, Martin (referee) ; Škorpil, Vladislav (advisor)
This thesis is concerned the technology with technologies of transfer through wireless devices. It is about possibilities of optimization of transfer in wireless net, especially of the reduction of interference influence. The first part is about theory and the standards development of wireless technology. There are methods and principles used in wireless technologies. The second part is a practical measuring and testing of an internal wireless net, with the emphasis being on the source of interference influence. Measuring was focused on interference between access points and was not about meteorological influence. It continues with theory and testing of interference of the microwave oven in our wireless net. Then, it is a practical demonstration of interference in an external environment. There are practical examples of interference between different providers’ nets on the same area and solutions to prevent or to cancel this interference. In next part of work the wireless net is parsed and described in a given territory. Here is described the way how to precede the reciprocal interference and eventually how this mutual disturbance suppress. Consequently, our net is optimized for customer growth and for today’s options of newer and more powerful components for wireless transfer. Finally there are two laboratory tasks. The first one is about practical measuring and testing of wireless net’s parameters and the second one is about simulation of wireless networks in the Opnet program.
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