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Identification and Decoding of Wireless Communication Using SDR
Matulka, Filip ; Bidlo, Michal (referee) ; Vašíček, Zdeněk (advisor)
The goal of this thesis is to create the system that uses concept of software defined radio. This system is capable of automatically identifying the communication parameteres and subsequent decoding of wireless communication. The thesis focus on the wireless system operationg in unlicened frequency band and cosidering fundamental modulation metods. The result is tested on two independent wireless systems that verify ability to automatically identify the communication parameters.
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Classification of digital modulation type
Balada, Radek ; Kováč,, Michal (referee) ; Povalač, Karel (advisor)
The aim of master’s thesis is a classification of digital modulation type. The interest in modulation classification has been growing for last years. It has several possible roles in both civilian and military applications such as spectrum sensing, signal confirmation, interference identification, monitoring and so on. Modulation classification is an intermediate step between signal detection and successful demodulation. Therefore the known methods are based on different statistics obtained from received signals. These statistics can be derived from continuous time signals and they hold for sampled signals.
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Software defined radio for LoRaWAN technology
Pospíšil, Ondřej ; Pokorný, Jiří (referee) ; Fujdiak, Radek (advisor)
This master's thesis deals with the description of LPWAN technologies focused on LoRaWAN technology in the theoretical part. The next part deals with description and analyzing of LoRaWAN protocol. In theoretical part also security elements of the LoRaWAN protocol are discussed and LoRaWAN 1.0.2 and 1.1.x versions are compared. The thesis also deals with LoRaWAN tapping and its decryption, both on the physical layer and the MAC protocol layer LoRaWAN. The thesis shows how to use software-defined radio to listen to LoRaWAN communication. Lastly, a replay attack and fake message over the fake session are performed
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Advanced Algorithms for Satellite Communication Signal Processing
Záplata, Filip ; Bezoušek, Pavel (referee) ; Šimša, Jan (referee) ; Kasal, Miroslav (advisor)
Dizertační práce je zaměřena na softwarově definované přijímače určené k úzkopásmové družicové komunikaci. Komunikační kanály družicových spojů zahrnujících komunikaci s hlubokým vesmírem jsou zatíženy vysokými úrovněmi šumu, typicky modelovaného AWGN, a silným Dopplerovým posuvem signálu způsobeným mimořádnou rychlostí pohybu objektu. Dizertační práce představuje možné postupy řešení výpočetně efektivní digitální downkonverze úzkopásmových signálů a systému odhadu kmitočtu nosné úzkopásmových signálů zatížených Dopplerovým posuvem v řádu násobků šířky pásma signálu. Popis navrhovaných algoritmů zahrnuje analytický postup jejich vývoje a tam, kde je to možné, i analytické hodnocení jejich chování. Algoritmy jsou modelovány v prostředí MATLAB Simulink a tyto modely jsou využity pro ověření vlastností simulacemi. Modely byly také využity k experimentálním testům na reálném signálu přijatém z družice PSAT v laboratoři experimentálních družic na ústavu radioelektroniky.
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Signal analyzer based on universal USB DVB-T receiver
Hoferek, Jakub ; Maršálek, Roman (referee) ; Derbek, Vojtěch (advisor)
This thesis deals with using a commercially available USB DVB-T tuner for spectrum analysis. In the first part, there are other possible platforms compared to income described hardware specific receiver tuner R820T and AD converter RTL2832. The next part is realized by a spectrum analyzer and a simple FM receiver. These functional units are created on GNU Radio and Matlab.
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RTL-SDR and its application in teaching of wireless communications
Dubina, Tomáš ; Polák, Ladislav (referee) ; Miloš, Jiří (advisor)
This bachelor thesis deals with the using of RTL-SDR dongle in wireless communication teaching. The first part discusses the SDR function and describes the properties of RTL-SDR. The second part deals with the communication chain and digital modulations. The last part describes the created mathematical model of the communication system and the concept of laboratory tasks. In the appendix there is one demonstration task suitable for teaching, including solutions.
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DAB Radio Receiver
Pišťák, Ondřej ; Götthans, Tomáš (referee) ; Dřínovský, Jiří (advisor)
This work is focused on design and construction of software defined radio that can play DAB+ standard. The received signal is processed by USB receiver RTL-SDR BLOF with 8 bits resolution A/D convertor RTL2832U and small single-board computer Raspberry Pi 3 (Model B). The work deals also with design and realization of control panel by which the radio is controlled. The LCD display is connected to Raspberry Pi and used for the screen information about currently playing radio program.
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Wireless communication analysis using software defined radio
Štrajt, Martin ; Štůsek, Martin (referee) ; Pokorný, Jiří (advisor)
The work deals with the use of software-defined radio as a probe for monitoring the operation of wireless communication according to the IEEE 802.11a/g standard. In the theoretical introduction, the concept of software-defined radio as a hardware device with software programmable circuits enabling the transmission or reception of signals in theoretically any frequency band is introduced. The introduction also contains adescription of selected devices and the IEEE 802.11 protocol with its most used additionsand modulations. In the first part of the practical part of the work, wireless communication is capturedusing a wireless network card in monitoring mode. The intercepted communication was decrypted and this decrypted traffic was compared with the data captured by the probe within the network. These results then served as acomparative basis for software-defined radio capturing. The focus of this work is to verify the capabilities of software-defined radio and its use for sniffing wireless communicationin the frequency band 2.4 GHz and 5 GHz. The attempt to use a software-defined radio here results from the scalability and adaptability that a wireless card cannot offer due to fixed hardware parameters. LimeSDR mini, LimeSDR and bladeRF 2.0 devices were used for capture. First, the configuration of the operating system, the installation of drivers and programs for control and work with selected devices are described. After verifying the functionality of the software-defined radio, a model of a signal decoder with the parameters of the IEEE 802.11g standard captured from the radio spectrum was put into operation. Finally, the data streams captured by the software-defined radio and the wireless network card were compared side by side. The results showed that the software-defined radio in the used configuration captures only a part of the total volume of transmitted frames.
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Multicarrier modulator and demodulator for software defined radio
Klučka, Jaroslav ; Urban, Josef (referee) ; Maršálek, Roman (advisor)
This thesis deals with computer simulation of the communication chain using the OFDM modulation. In the beginning of my thesis there is a brief description of digital modulations, especially OFDM. The model of the transmitter, radio channel and receiver, including a simple timing and frequency synchronization and equalization is designed and simulated in the Matlab environment. There is a designed communication system implemented into USRP development board in the Simulink environment. The development board could not work simultaneously as a transmitter and as a receiver. Function of the transmitter was verified by measuring on spectrum analyzer. Testing OFDM signal using the arbitrary waveform generator CompuGen 4302 was generated for the verification of the function of the receiver. Testing signal was received and demodulated on the development board which works as a receiver.
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