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Signal analyzer based on universal USB DVB-T receiver
Hoferek, Jakub ; Vychodil, Josef (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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Design and implementation of a wireless transmission system using USRP
Vaclík, Michal ; Mlýnek, Petr (referee) ; Krajsa, Ondřej (advisor)
This thesis is focused on design and possibilities of implementation of modular wireless communications system based on software defined radio. This system uses USRP1 kits from Ettus Research and is controlled by GNU Radio Companion software. Final Python script is used to controll and modify parameters of modulation schemes, encoder properties and used bitrate. Thesis also describes possibilities and challenges of using radio HW for transmitting and receiving. Final chapter summerizes and analyzes achieved transmission qualities.
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Softwarové rádio pro emulaci protokolů v RFID
Prachař, Petr ; Fuchs, Michal (referee) ; Derbek, Vojtěch (advisor)
This diploma thesis focuses on the design and implementation of an emulator of RFID protocols in a software defined radio. The designed emulator operates in the UHF band (860 MHz – 960 MHz). The main goal of this design is a very fast measurement of power characteristic of tag. The proposed solution is based on implementing the transmitter controls directly into the SDR. Thanks to this solution a reduction of delay between measurements occur compared to the conventional concept, when the transmitter parameters are controlled by the hosted PC. In this thesis, suitable platform based on research is chosen for implementation and also a concept of design is proposed and described herein, which is based on implementation of time critical algorithms directlyinto the software defined radio’s FPGA. The proposed solution was implemented into selected platforms and its functionality was experimentally verified.
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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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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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Software defined transceiver for radio amateur use
Paus, Anton ; Povalač, Karel (referee) ; Žalud, Václav (referee) ; Šrámek, Petr (advisor)
This project deals with possibilities of using the software defined radio conception for radio amateur use in a short wave band and its subsequent implementation into properly designed hardware. The aim of this work is to design a transceiver that would be capable of working in AM, FM, SSB, and CW modes. Within a theoretical part of the project the architectures of software defined radios and their components are discussed. This part was focused mainly on analog parts of the chain, such as amplifiers, filters and converters. Signal processing algorithms for both receiver and transmitter working in desired modes are studied subsequently and their computer models are built. Designed algorithms are implemented into FPGA structure (Virtex -5).
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Front end for software receiver
Slezák, Jakub ; Horský, Pavel (referee) ; Šrámek, Petr (advisor)
This thesis deals with a theoretical analysis of the basic parameters of receivers, input circuit architecture and signal digitization. According to the specified assignment it is outlined block scheme of front end for software receiver with specified components and the total bilance is calculated. Individual parts of the system are designed and realized. This is a set of four input filters for bandwidths: short waves up to 30 MHz, 87,5-108 MHz, 144-148 MHz and 174-230 MHz. The main point of design is a circuit containing a low-noise amplifiers, switches, and two amplifiers with adjustable amplification. Mainly are used integrated circuits from Analog Devices corporation. To control the various switches and adjustable amplifiers was designed a separate panel, which is connected to the main circuit via a cable. In the last phase was the whole system and its components subjected to measurements. Thanks to a number of mounted SMA connectors it is possible to measure different parts of the system and we are able to modify it partially.
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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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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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Implementation of software radio into FPGA
Šrámek, Petr ; Maršálek, Roman (referee) ; Prokeš, Aleš (advisor)
The common objective of this project is implementation of software defined radio (SDR) into FPGA. The text contains review and comparison of several hardware concepts intended for SDRs implementation then the methods for digital implementation of various components of radios as the filters, mixers and others are mentioned. Part of the text introduces used hardware platform and describes software support for designing, simulations and implementation into hardware. Significant part of project describes complex of external hardware components as filter, amplifier and control panel designed and built within the project realization. But the main part of project demonstrates design of the software solution of radio receiver. There is specified architecture of radio for FM broadcast receiving, next the more complex systems with carrier recovery algorithm are presented. These systems are able to work with AM, BPSK and QPSK modulations. It is possible to implement all these receivers into hardware and verify their operation. The practical laboratory theme has been outlined within the project run.
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