|
|
Measurement and Modeling of Wireless Network Coverage
Julínek, Pavel ; Prokopec, Jan (referee) ; Kaller, Ondřej (advisor)
The diploma thesis describes mobile communication systems GSM and UMTS including the operating principle of these systems. It also deals with the GPS issues and the determination of the location by this system. The signal path losses issues between the transmitter and receiver are also described. The focus is also put on Telit UC864-G model and the measurement system, operated by the created programme with the graphic user interface, which measures parameters of the cellular network according to entered input parameters and saves the measured values into the file. The part of the diploma thesis describes another created programme with the graphic user interface displaying the measured network parameters in map data with the possibility to compare the distribution of the measured signal value in both outdoor and indoor environment and the theoretical value set by the propagation models.
|
|
|
Expertimental GSM jammer
Charvát, Jiří ; Prokopec, Jan (referee) ; Frýza, Tomáš (advisor)
This thesis describes GSM communication, the method of its jamming and design of a jammer for this band. This document is mainly focused on design of the jammer with the variable bandwidth of jamming and the variable level of output power. Requested parameters of jamming are set by a control panel with a LCD display. In this document there is a detailed description of each function block and connection between them. At the end of this thesis there are released measured results of designed jammer.
|
|
|
Cellular Network Coverage Model
Unzeitig, Lubomír ; Mikulka, Jan (referee) ; Gleissner, Filip (advisor)
This work deals with a mobile signal propagation in electromagnetic wave form in a real environment of city microcell. The electromagnetic wave passing through the city environment is affected by many kinds of mechanism. It includes especially diffraction along vertical edges of buildings, diffraction across building roofs and buildings or ground refraction. These mechanisms are time variable. If we want to predicate them, we have to use sort of approached model. For an experimental part of this work, the Berg’s recursive model with a possibility of path loses or signal level prediction in a selected microcellular system is chosen. The software for a cellular network coverage is created on the basis of this fact. Its advantage is a possibility of up to five base stations placing and many kinds of settings, e.g. operating frequency, base station transmitting power, base and mobile station antennas height etc. There is a possibility of system GSM 900, GSM 1800 or UMTS choice. The Berg’s recursive model features are checked by simulations on experimental and real maps of build-up area.
|
guest ::
