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Koch, Mick V. "An Accessible Project 25 Receiver Using Low-Cost Software Defined Radio." Ohio University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1464007525.
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Fiumi, Federico. "Implementazione di un sistema di comunicazione digitale wireless mediante software-defined radio." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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Studio e implementazione di un sistema di comunicazione digitale a modulazione numerica QPSK. Il sistema è stato implementato tramite interfacciamento Simulink di due dispositivi software defined radio: URSP2 e NooElec RTL-SDR.
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Ardrey, David, Gregory Gimler, and Mark Pippitt. "A Software Defined Radio Based Architecture for the Reagan Test Site Telemetry Modernization (RTM) Program." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596436.
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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVMIT Lincoln Laboratory has developed a Software Defined Radio based architecture for the Reagan Test Site Telemetry Modernization (RTM) program, which will enhance the current operations of the ground based telemetry systems and enable new modes of operation. There are three main objectives of the RTM program; increasing overall system performance, improving reliability and maintainability, and enabling future customer needs. RTM provides a fully integrated system that can be configured and remotely controlled from a single location. This centralized command and control provides a way to automate certain functions and frees up operator resources, especially for more complex mission scenarios. Software modules, running on general-purpose computers perform signal and data processing that have been traditionally performed in special purpose hardware based components. This provides the flexibility to scale and adapt to future needs, such as spectrum change, increased need for capacity, and changes to modulation, encoding, and compression. Index Terms - Software Defined Radio (SDR), Open systems architecture, telemetry receiver architecture, Aeronautical Mobile Telemetry (AMT)
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Alhasan, Raghda. "Software defined radio." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-53361.
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Software Defined Radio (SDR) technology is used to receive and transmit radio signals. Radio signals can be received using the SDR_sharp software that can be downloaded to a personal computer and combined with the RTL-SDR dongle hardware that is connected to the computer. This report gives a brief explanation of the SDR receiver, the supported software, and some applications that can be implemented with SDR. Moreover, it is shown how to install the SDR_sharp software and the hardware Zadig. After installation, wideband FM (WFM) reception and adjustment of RF gain and frequency error is illustrated. The reception of some national, regional and community/commercial stations that can be received in Växjö Sweden is presented. Keyword: Software defined radio, FM radio.
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Nash, Christopher, and Christopher Hogstrom. "SOQPSK Software Defined Radio." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596411.
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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVThis paper presents the results of laboratory experiments using a commercial-off-the-shelf software defined radio to demodulate SOQPSK-TG for aeronautical telemetry. Using the NI USRP N210 and Zynq™ processor, we achieved 900 kbits/s demodulation and found that the USRP N210 has a signal sensitivity of -71 dBm at a BER of 10⁻⁶.
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Antunes, Lúcia Margarida da Mata. "Software defined radio em FPGA." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2150.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesEsta dissertação teve como objectivo o desenvolvimento de parte de um receptor para Digital Audio Broadcasting (DAB) recorrendo aos conceitos ditados por Software Defined Radio (SDR). O receptor de rádio inclui a conversão de digital para analógico e a subsequente desmodelação de banda- base,pelo que é possível aceder à bit stream em qualquer ponto do sistema. A dissertação foi dividida em duas fases. Na primeira, o receptor completo foi simulado em MATLAB. Na segunda, o mesmo sistema foi implementado e testado numa placa XtremeDSP Development Kit-IV, a qual contêm um Field-Programmable Gate Array (FPGA). O sistema simulado foi testado com dois tipos de amostras. As primeiras consistiram em sinais DAB gerados em MATLAB e posteriormente distorcidos por diferentes canais também simulados pelo mesmo software. Foi assim possível fazer um estudo da probabilidade de erro quando o sinal é exposto a diferentes perturbações, como ruído, desvios na frequência e no tempo. O sistema foi ainda testado com amostras DAB reais. As constelações desmodelados mostraram o correcto funcionamento do sistema. Apenas parte do receptor simulado foi implementado no FPGA. A parte já desenvolvida consiste nas funções de desmodelação: desmodelação OFDM, desmodelação diferencial, frequency deinterleaving e demapeamento QPSK. O sistema de sincronização DAB não foi implementado. O sistema já desenvolvido é assim capaz de desmodelar um sinal DAB gerado no MATLAB, desde que este não contenha qualquer distorção. ABSTRACT: The aim of this dissertation was the development of part of a Digital Audio Broadcasting (DAB) receiver by means of Software Defined Radio (SDR). This radio receiver includes the Intermediate Frequency (IF) to baseband conversion and the subsequent baseband demodulation, thus one may access the bit stream in any point of the system. This dissertation was divided in two phases. In the first one, the whole DAB system was simulated in MATLAB. In the second, the receiver was implemented and tested in an XtremeDSP Development Kit-IV platform, which includes a Field-Programmable Gate Array (FPGA). The simulated system was tested with two kinds of samples. The first ones were generated in MATLAB and subsequently distorted by different channel conditions also simulated in the same software. This well known DAB digital signal allowed us to perform a Bit Error Rate (BER) study with several channel conditions, such as noise, multipath, frequency and time offsets. Further on, real DAB samples were used for testing. The demodulated QPSK constellations showed the correct operation of the system. Only part of the simulated receiver was implemented in the FPGA. This part consists in the channel demodulation functions: OFDM demodulation, differential demodulation, frequency deinterleaving and QPSK demapper. The DAB synchronization block was not implemented. The developed system is able to recover the modulated bit stream from the digital signal produced in MATLAB, since this signal is free of noise, frequency and time offsets
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Smuts, Matthys. "Software modem for a software defined radio system." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/1985.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.The use of older and slower protocols has become increasingly difficult to justify due to the rapid pace at which telecommunications are advancing. To keep up to date with the latest technologies, the communications system must be designed to accommodate the transparent insertion of new communications standards in all the stages of a system. The system should, however, also remain compatible with the older standards so as not to demand an upgrade of the older systems. The concept of a software defined radio was introduced to overcome these problems. In a software defined radio system, the functionality of the communications system is defined in software, which removes the the need for alterations to the hardware during technology upgrade. To maintain interoperatibilty, the system must be based on a standardised architecture. This would further allow for enhanced scalability and provide a plug-andplay feature for the components of the system. In this thesis, generic signal processing software components are developed to illustrate the creation of a basic software modem that can be parameterised to comply fully, or partially, to various standards.
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Paffetti, Michele. "Software Defined Radio for NB-IoT." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/14315/.
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The next generation of mobile radio systems is expected to providing wireless connectivity for a wide range of new applications and services involving not only people but also machines and objects. Within few years, billions of low-cost and low-complexity devices and sensors will be connected to the Internet, forming a converged ecosystem called Internet of Things
(IoT). As a result, in 2016, 3GPP standardizes NB-IoT, the new narrowband radio technology developed for the IoT market. Massive connectivity, reduced UE complexity, coverage
extension and deployment flexibility are the targets for this new radio interface, which also ensures harmonious coexistence with current GSM, GPRS and LTE systems. In parallel, the rise of open-source software combined with Software Defined Radio (SDR) solutions has completely changed radio systems engineering in the late years. This thesis focuses on developing the NB-IoT’s protocol stack on the EURECOM’s open-source software platform OpenAirInterface (OAI). First part of this work aims to implement NB-IoT’s Radio Resource Control functionalities on OAI. After an introduction to the platform architecture, a new RRC layer code structure and related interfaces are defined, along with a new approach for Signalling Radio Bearers management. A deep analysis on System Information scheduling is conducted and a subframe-based transmission scheme is then proposed. The last part of this thesis addresses the implementation of a multi-vendor platform interface based on Small Cell Forum’s Functional Application Platform Interface (FAPI) standard. A configurable and dynamically loadable Interface Module (IF-Module) is designed between OAI’s MAC and PHY layers. Primitives and related code structures are presented as well as corresponding Data
and Configuration’s procedures. Finally, the convergence of both NB-IoT and FAPI requirements lead to re-design PHY layer mechanisms for which a downlink transmission scheme is
proposed.
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Sundquist, Thomas. "Waveform Development using Software Defined Radio." Thesis, Linköping University, Department of Science and Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6464.
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Software Defined Radio (SDR) is a conception of implementing radio functions in computer software, instead of having electronics performing the functions. This thesis aims to compare two different ways of implementing these functions, or waveforms.
The Software Communications Architecture (SCA) is an open standard developed by the United States Department of Defense. It uses a CORBA interface environment to make waveform applications interoperable and platform independent. This method of developing SDR is compared to an open-source initiative going by the name GNU Radio.
Two waveform applications are developed, one transmitter using SCA, and one receiver using GNU Radio. The analog radio interface is simulated using the sound cards of two regular PCs. The development is done using the C++ and Python programming languages.
This thesis examines pros and cons of the two SDR methods, as well as performing studies of Software Defined Radio in general.
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Dumont, Nathan. "Software defined radio for cognitive networks." Thesis, University of Bath, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619232.
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The introduction of software radio has meant that standards for radio communication can evolve in a much more natural way, changing only a little at a time without making all of the hardware obsolete. It has become apparent that these changes may affect some systems more favourably than others so allowing the software radio to decide how to adapt can actually improve the link quality. This development is known as cognitive radio and can improve the performance of a single radio link. As an extension of this progress is being made on designing cognitive networks where the software radios which make up the network not only optimise their own link but share information about their goals and situation with other nodes in the network, using all of this data together can optimise overall end-to-end performance of the network. These advances in network design and optimisation come at a time where many parts of the world are re-structuring the television broadcast bands. These have been allocated for a long time and are a generous allocation of a valuable resource. With the power of a cognitive network it is possible to design equipment that can automatically avoid the licensed TV transmitters which only take a fraction of the total bandwidth in any one area. This allows many smaller cells to be fitted between the main transmitters. Assessing the availability of bandwidth and generating maps of available spectrum for these new cognitive networks requires a new approach to radio propagation modelling in the TV bands. Previous models use a worst case scenario to make sure that there is at least enough signal to receive the public service broadcasts in the majority of homes. Predicting where the limits of reception are and where it would be safe to broadcast on these channels requires a better, terrain dependent transmission model. In this thesis the Parabolic Equation Model is applied to the problem of predicting TV band occupancy and the results of this modelling is compared to field measurement to get an idea of how accurate the model is in practice.
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Kohls, Nicholas Everett. "Software Defined Radio Short Range Radar." BYU ScholarsArchive, 2021. https://scholarsarchive.byu.edu/etd/9027.
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High cost is a current problem with modern radar systems. Software-defined radios (SDRs) offer a possible solution for low-cost customizable radar systems. An SDR is a radio communi- cation system where, instead of the traditional radio components implemented in hardware, many of the components are implemented in software on a computer or embedded system. Although SDRs were originally designed for wireless communication systems, the firmware of an SDR can be configured into a radar system. With new companies entering the market, various types of low- cost SDRs have emerged. This thesis explores the use of a LimeSDR-Mini in a short-range radar through open software tools and custom code. The LimeSDR-Mini is successfully shown to detect targets at a short range. However, due to the instability of the LimeSDR-Mini, the consistent detection of a target is not possible. This thesis shows how the LimeSDR is characterized and how timing synchronization and instability issues are mitigated. The LimeSDR-Mini falls short of operating reliable in a radar system and other SDR boards need to be explored as viable options. Test setups using coaxial cables and test setups using antennas in an outdoor environment show the instability of the LimeSDR-Mini. The transmitter and the receiver are asynchronous. The timing difference varies slightly from run to run, which results in issues that are exacerbated in a short-range radar. The bleed-through signal is the signal leakage from the transmitter to the receiver. The bleed-through signal prevents the detection of targets at a short-range. Feed-through nulling is a signal processing technique used to eliminate the bleed-through signal so that short- range targets can be detected. The instability of the LimeSDR-Mini reduces the effectiveness of feed-through nulling techniques.
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Martins, Francisco Arrabaça. "Waveform generator for Software Defined Radio." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/11040.
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Mestrado em Engenharia Eléctrónica e TelecomunicaçõesEsta dissertação insere-se na área de eletrónica de radio frequência, mais concretamente na geração de sinal para caracterizar sistemas com a arquitetura Software Denned Radio (SDR). Esta arquitetura tem como conceito a definição de um rádio completamente ajustável por software, através de conversão de blocos de domínio análgico para digital. Atendendo a importância que as novas tecnologias têm nos dias de hoje, os sistemas SDR aparecem como uma solução, uma vez que tendem a diminuir a parte de hardware, aproximando a conversão para o domínio digital cada vez mais próxima da antena. Neste trabalho propõem-se duas implementações, um gerador CW (Continuous Wave) que tem como funções estimular um dispositivo sobre teste e ainda de actuar como oscilador local. A outra implementação assemelhando-se com a arquitetura de um gerador AWG (Arbitrary Waveform Generator) que terá como função originar dois tons para estimular um dispositivo sobre teste. A gama de frequências encontra-se entre os 40 e 1000 MHz.
This dissertation is inserted into the area of radio frequency electronics, specially in signal generation to characterize systems with Software Defined Radio (SDR) architecture. This architecture has like a concept defining a radio completely adjustable by software, by converting blocks of the analog domain to the digital domain. This architecture has like a concept defining a radio completely adjustable by software, by converting blocks of the analog domain to the digital domain. Considering the importance that new technologies have nowadays, SDR systems appear as a solution since they tend to reduce the hardware part by approximating the conversion to the digital domain closer and closer to the antenna. In this work, two implementations are proposed, one is a CW (Continuous Wave) generator which has the function to stimulate a device under test and also to act as a local oscillator. In the other implementation, that has a similar architecture of an AWG (Arbitrary Waveform Generator) generator has as function generating two tones to stimulate a device under test.
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Tsoeunyane, Lekhobola Joachim. "RHINO software-defined radio processing blocks." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20102.
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This MSc project focuses on the design and implementation of a library of parameterizable, modular and reusable Digital IP blocks designed around use in Software-Defined Radio (SDR) applications and compatibility with the RHINO platform. The RHINO platform has commonalities with the better known ROACH platform, but it is a significantly cut-down and lowercost alternative which has similarities in the interfacing and FPGA/Processor interconnects of ROACH. The purpose of the library and design framework presented in this work aims to alleviate some of the commercial, high cost and static structure concerns about IP cores provided by FPGA manufactures and third-party IP vendors. It will also work around the lack of parameters and bus compatibility issues often encountered when using the freely available open resources. The RHINO hardware platform will be used for running practical applications and testing of the blocks. The HDL library that is being constructed is targeted towards both novice and experienced low-level HDL developers who can download and use it for free, and it will provide them experience of using IP Cores that support open bus interfaces in order to exploit SoC design without commercial, parameter and bus compatibility limitations. The provided modules will be of particularly benefit to the novice developers in providing ready-made examples of processing blocks, as well as parameterization settings for the interfacing blocks and associated RF receiver side configuration settings; all together these examples will help new developers establish effective ways to build their own SDR prototypes using RHINO.
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Becker, Brandon, and Charles Bennett. "Software Defined Radio MIMO Telemetry Transmitter." International Foundation for Telemetering, 2016. http://hdl.handle.net/10150/624241.
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This paper describes the development of a small, low-cost, and flexible telemetry transmitter that
can be used for multiple-input multiple-output (MIMO) communication systems. In the intended
application, the transmitter will collect data from sensors on small quad copters or drones,
regarding the vehicle’s attitude, location, movement, and other flight data. This will be combined
into a single data stream, and base-band modulation applied by a field programmable gate array
(FPGA). The FPGA output will control a separate RF modulation board, which will generate a
pair of RF signals suitable for use in a 2x2 MIMO system. The original application uses the 902-
928MHz ISM band. The modulation format can be altered by changing the software for the
FPGA.
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Duarte, Miguel Filipe Batista. "Spectrum sensing through software defined radio." Master's thesis, Faculdade de Ciências e Tecnologia, 2014. http://hdl.handle.net/10362/12293.
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Dissertação apresentada para obtenção do Grau de Mestre em Engenharia Electrotécnica e de Computadores, pela Universidade Nova de Lisboa, Faculdade de Ciências e TecnologiaA change in paradigm when it comes to controlling radio transmissions is in course. Tasks usually executed in an exclusive class of hardware systems are increasingly controlled by software systems. A deep change to the software domain is foreseeable, creating a true Software Defined Radio. At the same time this change occurs, the radioelectric spectrum is almost completely licensed. However, the spectrum is rarely used to its full extent over time, enabling its opportunistic use while the licensed devices do not communicate. This is a part of the notion of Cognitive Radio, a new kind of radio capable of using the spectrum in an opportunistic way. These two new paradigms in radio access can be combined to produce a exible and reliable radio, overcoming the issues with radioelectric spectrum scarcity. This dissertation starts an exploration in this area by combining these two paradigms through the use of an Energy Detector implemented in a Universal Software Radio Peripheral device and using the GNURadio suite. The performance of such a system is tested by calculating the Probabilities of Detection and False Alarm in real scenarios and comparing them to the expected theoretical values. A method for defining thresholds for narrowband signals is also tested based on works in Information Theory concepts, i.e.,the Akaike Information Criteria and the Minimum Description Length. The results are tested for a real transmission using two USRP platforms communicating with each other,one acting as the licensed user and the other acting as the secondary, opportunistic user. Finally, we highlight the technological work developed in this dissertation, which may support future research works through the use of the developed scripts, allowing a faster method to test algorithms with different parameterization.
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Pratt, Jason Michael. "A software defined radio for research into cognitive radio." Diss., Rolla, Mo. : University of Missouri-Rolla, 2007. http://scholarsmine.mst.edu/thesis/pdf/Pratt2_09007dcc8049b35e.pdf.
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Thesis (M.S.)--University of Missouri--Rolla, 2007.Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed December 7, 2007) Includes bibliographical references (p. 171-173).
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Cronje, Johannes Jacobus. "Software architecture design of a software defined radio system." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50095.
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Thesis (MScEng)--University of Stellenbosch, 2004.ENGLISH ABSTRACT: The high pace of technological advancement enables the realisation of ever more advanced mobile communications standards with more functionality than simple voice communications. The hardware that is used to implement the radio sections of these systems generally require long design cycles, much longer than the design cycles of the other components of a communications system. Another problem is that, once new communications standards are introduced, the current hardware platforms used in the terminal equipment becomes obsolete because they can generally not be used with the new standards. This has serious cost implications for both the service provider and the consumer, because both parties have to acquire new equipment to be able to use the new standards. An elegant solution to the above issues is to use software-defined radio sections to replace the hardware radio components. New communications standards can then be supported by simply loading new software onto the equipment, provided the maximum processing capacity of the processor(s) that the software runs on can accommodate the bandwidth requirements of that specific standard. This thesis investigates the ideas behind software defined radio and also describes the design and implementation of a software architecture that can be used to implement software defined radios on general-purpose platforms such as personal computers.
AFRIKAANSE OPSOMMING: Die hoë tempo van tegnologiese vordering maak dit moontlik om baie gevorderde mobiele kommunikasie standaarde te implementeer wat meer funksionaliteit bied as blote spraakkommunikasie. Die hardeware wat gebruik word om die radios van sulke stelsels te implementeer neem gewoonlik langer om te ontwikkel as die ander komponente van die stelsels. Die ander probleem is dat hierdie hardeware gewoonlik nie hergebruik kan word wanneer nuwe kommunikasie standaarde in gebruik geneem word nie omdat die standaarde nie versoenbaar is nie. Dit het tot gevolg dat beide die verbruiker en die diensverskaffer groot bedrae geld moet spandeer om die nuwe tegnologie te kan gebruik. 'n Elegante oplossing vir hierdie probleme is om gebruik te maak van radios waarvan die funksionaliteit in sagteware gedefiniëer word. Nuwe kommunikasie standaarde kan dan gebruik word deur slegs die nodige sagteware op die toerusting te laai, solank die verwerkingskapasiteit van die mikroverwerkers in die stelsel die benodigde bandwydte kan akkommodeer. Hierdie tesis ondersoek die konsepte van sagteware-gedefiniëerde radio en beskryf die ontwerp en implementering van 'n sagteware argitektuur vir die implementering van sagteware-gedefiniëerde radios op veeldoelige platforms soos persoonlike rekenaars.
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Rhiemeier, Arnd-Ragnar [Verfasser]. "Modulares Software-defined Radio / Arnd-Ragnar Rhiemeier." Karlsruhe : Inst. für Nachrichtentechnik, 2005. http://d-nb.info/1001464257/34.
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Cruz, Pedro Miguel Duarte. "Characterization of systems for software defined radio." Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/1938.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesEsta dissertação insere-se na área de electrónica de rádio frequência, mais precisamente na caracterização de sistemas para rádios definidos por software (SDR). Um SDR é aquele que possui a flexibilidade para sintonizar, filtrar, ajustar a taxa de transmissão e controlar o tipo de modulação através de software. O aparecimento de novas tecnologias no mercado obriga à utilização de uma quantidade considerável de hardware nos dispositivos de transmissão/recepção, assim uma solução consiste no uso de arquitecturas de SDR onde a conversão do sinal analógico para digital é executada o mais próximo possível da antena e, sendo depois todo o processamento efectuado digitalmente. Assim, nesta tese, é apresentado um modelo comportamental para receptores de SDR, que leva em conta os elementos chave da distorção não linear. Além disso, são apresentadas algumas comparações entre simulações e medidas usando sinais multi-seno e WiMax usando um receptor ideal de SDR. Finalmente, é proposto um novo sistema de caracterização para dispositivos de SDR. ABSTRACT: This dissertation is related to the radio frequency area, more specifically to the characterization of systems for software-defined radio. A software-defined radio is one that has the flexibility to tune, filter, set the transmission rate and control the modulation type only by software. The emergence of new technologies in the market forces the use of a considerable quantity of hardware in the transceivers systems, so a viable solution for this is to use SDR solutions where the analogue to digital conversion is made closest possible of the antenna and then make all the processing digitally. So, in this dissertation, a behavioral model for SDR front end receiver evaluation, that captures the key elements of the nonlinear distortion, is proposed. Moreover, some comparisons between measured and simulated results under multisine and WiMax excitations are presented using the ideal SDR receiver. Finally, a new instrumentation system for characterization of SDR front ends is proposed.
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Matos, Luís Carlos de Oliveira. "Design platform for software defined radio systems." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10210.
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Mestrado em Engenharia Electrónica e TelecomunicaçõesEste trabalho tem como objetivos o projeto e a realização de uma plataforma para desenvolvimento de sistemas baseados em tecnologia Software Defined Radio (SDR). Num sistema SDR todas as tarefas de um rádio (ou pelo menos banda base e eventualmente Frequência Intermédia), anteriormente efetuadas por hardware especifico num contexto analógico, são efetuadas no domínio digital por software ou hardware reconfigurável. Esta característica confere a este tipo de rádio uma maior simplicidade, em termos de hardware bem como maior flexibilidade, pois o mesmo dispositivo pode executar diferentes funções apenas alterando o seu firmware/software. Existem diferentes abordagens relativas ao uso desta tecnologia, quer ao nível da arquitetura usada (varia consoante a frequência onde ocorre a digitalização do sinal), quer relativas á topologia de utilização (controlada por hardware reconfigurável, rotinas de software ou ambos). A motivação deste trabalho resulta na necessidade de concepção de uma plataforma para fins académicos baseada num hardware reprogramável, Field Programmable Gate Array (FPGA), de baixo custo, flexível, com interfaces de comunicação digitais e analógicas e que faculte a possibilidade de ser usada em diferentes topologias de utilização. Efetuada a especificação e o estudo necessário ao projeto bem como a escolha apropriada de componentes, conseguiu-se uma plataforma baseada num módulo FPGA contendo um dispositivo Xilinx, da família Spartan-6, bem como outro hardware relevante. A comunicação com outros dispositivos é assegurada por interfaces USB e gigabit Ethernet. A plataforma concebida está também equipada com interfaces analógicas (conversores AD/DA) bem como algumas interfaces de integração com o utilizador consistindo em switches e LEDs. Em suma foi projetada e desenhada uma plataforma aberta e flexível, que pode ser usada com todas as ferramentas de desenvolvimento, programação e depuração, com fácil acesso a todos os sinais relevantes potenciando a sua utilização para efeitos de ensino e investigação em SDR.
The main objective of this dissertation relies on projecting and designing a platform suitable for Software De ned Radio (SDR) system development. On an SDR system all, or at least base band and maybe Intermediate Frequency (IF) radio functions, before handled by analog speci c hardware, are now performed on the digital domain by software or an recon gurable hardware device. This feature provides to this type of radios a major simplicity regarding hardware as well as another exibility level since, through a rmware/software upgrade, the same equipment can perform di erent functions. There are some approaches related to the used of this technology, either regarding architecture implementation (they di er in which frequency the digitalization occurs) or utilization topologies (an SDR device can be controlled by a recon gurable hardware, software routines or both). This project's motivation results from the need of designing a exible, low-cost platform, to be used on academic purposes, in which the central component would be a recon gurable hardware, a Field Programmable Gate Array (FPGA). It must provide both analog and digital interfaces so that can be used on various utilization scenarios. Accomplished all the necessary study, design and hardware selection the result is a platform based on an FPGA module, containing an Xilinx device from the Spartan-6 family as well as other relevant hardware. The interaction with other devices is ensured by both gigabit Ethernet and 2.0 Universal Serial Bus (USB) connections. The platform also features analog interfaces (AD/DA converters) as well as some digital end-user interfaces performed by switches and Light Emiter Diodes (LED)s. Concluding, it was built an open and exible platform in which can be use with all provided development, programming and debugging tools and all the relevant signals have easy access enhancing its use for teaching and researching on SDR technology.
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Ödquist, Matilda. "Software-Defined Radio Receiver for IEEE 802.11n." Thesis, Linköpings universitet, Kommunikationssystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-170724.
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This thesis studies the physical layer (PHY layer) of the IEEE 802.11n wireless local area network (WLAN) standard. The possibility of integrating a receiver designed according to the standard with software-defined radios is investigated. The proposed design was implemented in MATLAB and tested using two softwaredefined radios. One of the radios transmitted IEEE 802.11n signals whilst the other one captured them and sent them to a computer for decoding. In this way, evaluation of the proposed receiver design was done. The tests resulted in successfully decoded WLAN packets, although errors occured regularly due to distortions in the air. The proposed MATLAB design can be developed further, with more features, for future tests and research.
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Patton, Lee K. "A GNU Radio Based Software-Defined Radar." Wright State University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=wright1176142845.
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Sun, Yi-Ran. "Generalized Bandpass Sampling Receivers for Software Defined Radio." Doctoral thesis, Stockholm, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4009.
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Humphris, Les. "Software Defined Radio for Maritime Collision Avoidance Applications." Thesis, University of Canterbury. Electrical and Electronic Engineering, 2015. http://hdl.handle.net/10092/11217.
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The design and development of a software defined radio (SDR) receiver prototype has been completed. The goal is to replace the existing automatic identification system (AIS) manufactured by Vesper Marine with a software driven system that reduces costs and provides a high
degree of reconfigurability. One of the key concepts of the SDR is the consideration of directly digitizing the radio frequency (RF) signal using subsampling. This idea arises from the ambition to implement an analog-to-digital converter (ADC) as close to the antenna interface as
practically possible. Thus, majority of the RF processing is encapsulated within in the digital domain. Evaluation of a frequency planning strategy that utilizes a combination of subsampling and oversampling will illustrate how the maritime bandwidth is aliased to a lower frequency. An analog front-end (AFE) board was constructed to implement the frequency planning strategy so that the digitized bandwidth can be streamed into a field programmable gate array (FPGA)
for real-time processing. Research is shown on digital front-end (DFE) techniques that condition the digitized maritime signal for baseband processing. The process of a digital down converter (DDC) is conducted by an FPGA, which acquired the in-phase and quadrature signals. By implementing a digital signal processor (DSP) for baseband processing, demodulation on an AIS test signal is evaluated. The SDR prototype achieved a receiver sensitivity of -113dBm, outperforming the required sensitivity of -107dBm specified in the International Electrotechnical Commission (IEC) 62287-1 standard for AIS applications [1].
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Brady, Richard. "A Cross Platform Framework for Software Defined Radio." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/2056.
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Thesis (MScEng (Electical and Electronic Engineering))--University of Stellenbosch, 2007.Software defined radios (SDRs) implement in software those parts of a radio which have traditionally been implemented in analogue hardware. We explain the importance of this definition and introduce reconfigurability and portability as two further goals. Reconfigurabilty is a property of the SDR platform, which may be a microprocessor, configurable hardware device, or combination of the two. We demonstrate that the field-programmable gate array is suficient for the implementation of practical SDR systems. Portability, on the other hand, is a property of the modulation and demodulation software, also known as waveform specification software. We evaluate techniques for achieving portability and show that waveforms can be specified in a generic form suitable for the autogeneration of implementations targetting both microprocessor- and FPGA-based architectures. The generated code is in C++ and VHDL respectively, and the tools used include formal models of computation and the XSLT language.
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Carey-Smith, Bruce Ernest. "Wide tuning range filters for software defined radio." Thesis, University of Bristol, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440036.
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Mathapo, Kgabo Frans. "A software-defined radio implementation of maritime AIS." Thesis, Link to the online version, 2007. http://hdl.handle.net/10019/678.
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Olivieri, Steven J. "Modular FPGA-Based Software Defined Radio for CubeSats." Digital WPI, 2011. https://digitalcommons.wpi.edu/etd-theses/375.
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Digital communications devices designed with application-specific integrated circuit (ASIC) technology suffer from one very significant limitation�the integrated circuits are not programmable. Therefore, deploying a new algorithm or an updated standard requires new hardware. Field-programmable gate arrays (FPGAs) solve this problem by introducing what is essentially reconfigurable hardware. Thus, digital communications devices designed on FPGAs are capable of accommodating multiple communications protocols without the need to deploy new hardware, and can support new protocols in a matter of seconds. In addition, FPGAs provide a means to update systems that are physical difficult to access. For these reasons, FPGAs provide us with an ideal platform for implementing adaptive communications algorithms. This thesis focuses on using FPGAs to implement an adaptive digital communications system. Using the Universal Software Radio Peripheral (USRP) as a base, this thesis aims to create a highly-adaptive, plug and play software-defined radio (SDR) that fits CubeSat form-factor satellites. Such a radio platform would enable CubeSat engineers to develop new satellites faster and with lower costs. This thesis presents a new system, the COSMIAC CubeSat SDR, that adapts the USRP platform to better suit the space and power limitations of a CubeSat.
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Leferman, Michael Joseph. "Rapid Prototyping Interface for Software Defined Radio Experimentation." Digital WPI, 2010. https://digitalcommons.wpi.edu/etd-theses/117.
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This thesis focuses on a user-friendly software-defined radio (SDR) development workflow for prototyping, research and education in wireless communications and networks. Specifically, a Simulink interface to the Universal Software Radio Peripheral 2(USRP2) SDR platform is devised in order to enable over-the-air data transmission and reception using a Simulink signal source and sink, in addition to controlling a subset of the hardware resources of the USRP2 platform. Using the USRP2 as the RF front end, this interface will use Simulink for software radio development and signal processing libraries of the digital baseband component of the communication transceiver design. This combination of hardware and software will enable the rapid design, implementation, and verification of digital communications systems in simulation, while allowing the user to easily test the system with near real time over-the-air transmission. The use of Simulink and MATLAB for communication transceiver development will provide streaming access to the USRP2 without the steep learning curve associated with current workflows. These widely available software packages and the USRP2 will make digital communication system prototyping both affordable yet highly versatile, enabling researchers and industry engineers to conduct studies into new wireless communications and networking architectures including cognitive radio. Furthermore, the interface will allow users to become familiar with tools used in industry while learning communications and networking concepts.
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Van, Wyk John Foster. "Reusable software defined radio platform for micro-satellites." Thesis, Link to the online version, 2008. http://hdl.handle.net/10019/1346.
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Crespo, Marques Elaine. "Sparse channels estimation applied in software defined radio." Electronic Thesis or Diss., Institut polytechnique de Paris, 2019. http://www.theses.fr/2019IPPAT004.
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Les canaux de communication sont utilisés pour transmettre des signaux d'information. Cependant, ces canaux peuvent causer plusieurs distorsions sur le signal à transmettre, telles que l'atténuation, la perte par trajets multiples et le décalage Doppler, entre autres. Pour une meilleure récupération des messages, le récepteur peut estimer le canal et améliorer la fiabilité des systèmes de communication. Plusieurs systèmes de communication, tels que la télévision haute définition, le système mmWave, les large bande HF et les bandes ultra-large, disposent de canaux parcimonieux. Cette caractéristique peut être utilisée pour améliorer les performances de l'estimateur et réduire la taille de la séquence d'apprentissage, diminuant ainsi la puissance consommée et la bande passante. Cette thèse traite le problème de l'estimation du canal en explorant des méthodes qui exploitent sa parcimonie. L'étude de l'acquisition comprimée et de ses algorithmes a conduit à la proposition d'un nouvel algorithme appelé Matching Pursuit based Least Square (MPLS). L'utilisation de réseaux de neurones (NN) pour l'estimation de signaux parcimonieux a également été explorée. Les travaux ont été axés sur NN, inspirés d'algorithmes d'd'acquisition comprimée tels que Learned Iterative Shrinkage-Thresholding Algorithm (LISTA). Cela a abouti à deux approches qui améliorent les performances de LISTA ainsi qu'à un nouveau réseau de neurones adapté à l'estimation de signaux parcimonieuxCommunication channels are used to transmit information signals. However, these channels can cause several distortions on the signal to be transmitted, such as attenuation, multipath loss and Doppler shift, among others. For a better message recovery, the receiver can estimate the channel and bring more reliability to the communications systems. Several communications systems, for example high-definition television, mmWave system, wideband HF and ultra-wideband have sparse channels. This characteristic can be used to improve the performance of the estimator and reduce the size of the training sequence so decreasing the consumption power and bandwidth. This thesis handles the channel estimation problem by investigating methods that exploit the sparsity of the channel. The study of Compressive Sensing and its sparse recovery algorithms led to the proposition of a new algorithm called Matching Pursuit based on Least Square (MPLS). The use of neural networks (NN) to sparse signals estimation was also explored. The work focused on NN inspired by sparse recovery algorithms such as Learned Iterative Shrinkage-Thresholding Algorithm (LISTA). This resulted in two approaches that improve LISTA performance as well as to a new neural network suitable to estimate sparse signals
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Channamallu, Aditya. "Software Defined Radio Based Modulated Scatterer Antenna Measurement." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4447.
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The modulated scattering technique is used in conjunction with a Software Defined Radio (SDR) dongle to obtain a software-based modulated signal output. SDR# is the software package used to get spectrum analysis of the modulated signal. A transmitter yagi antenna sends a 2.304GHz signal on to an antenna connected to a reflector coefficient modulator (700Hz) and the modulated waves are received by another yagi. The receiver yagi antenna is then connected to a frequency converter to convert a 2.304GHz signal to a 144MHz dongle input signal which finally puts the scattered output on computer software with a SDR dongle. The output has a center frequency with modulated spectral lines on either side of the measured frequency. Finally, antenna patterns are measured with different types of antennas by rotating the antennas and observing the baseband modulation sidebands.
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Kennedy, Paul. "Design of Software Defined Radio for SuperDARN Radar." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89908.
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Software defined radio (SDR) is a rapidly developing field enabled by continuing improvements in digital electronics. Software defined radio has been used extensively in communication systems due to its flexibility and cost effectiveness. Recently, SDR has been incorporated into radar systems, particularly for ionospheric research. This study investigated the benefits and design of a high frequency (HF) SDR receiver for the next generation of Super Dual Auroral Network (SuperDARN) radars. This work analyzed digital beamforming and waveform design approaches that would be enabled by the adoption of a SDR based radar design and found that these techniques could improve the performance of SuperDARN radars. This work also developed a prototype receiver to demonstrate the feasibility of a SDR based SuperDARN radar. The hardware selection for this receiver leveraged low-cost commercial off-the-shelf software defined radios and amplifier designs supplemented by custom filters. The software implementation utilized GNU Radio, an open source SDR and signal processing platform, to process and record receiver data. A prototype was successfully designed and constructed using the Red Pitaya software defined radio. This prototype included a 4 channel receiver which was evaluated in the laboratory setting and tested at the Blackstone, Virginia radar site. A comparison of results from the prototype receiver and the existing hardware showed promise for the use of this platform in future ionospheric research.M.S.
Software defined radio (SDR) is a rapidly developing field which uses software to perform radio signal processing traditionally accomplished by hardware components. Software defined radio has been used extensively in communication systems due to its flexibility and cost effectiveness. Recently, SDR has been incorporated into radar systems, particularly for space science research. This study investigated the benefits and design of a SDR receiver for the next generation of Super Dual Auroral Network (SuperDARN) radars. This work analyzed radar design approaches that would be enabled by the adoption of a SDR framework and found techniques that could improve the performance of SuperDARN radars. This work also developed a prototype receiver using low-cost commercial off-the-shelf software defined radios to demonstrate the feasibility of a SDR based SuperDARN radar. A prototype was successfully designed and constructed using the Red Pitaya software defined radio. This prototype was evaluated in the laboratory setting and tested at the Blackstone, Virginia radar site. A comparison of results from the prototype receiver and the existing hardware showed promise for the use of this platform in future space science research.
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Bar, Roee. "In-vehicle powerline communication using software-defined radio." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/58762.
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Powerline communication is an attractive solution for in-vehicle communication. However, the research of communication over powerlines requires field-testing and full access to communication protocol layers, particularly to the physical and the Media Access Control (MAC) layers. This ability can be accomplished through the use of software-defined radio along with real-time signal processing executed on a personal computer. In this work, we present the design and implementation of an IEEE 1901-based transceiver aimed for vehicular powerlines, written for GNU Radio and operated on Ettus Universal Software Radio Peripheral (USRP) N210 hardware. The software components include a C++ physical layer signal processing library and several complementary GNU Radio blocks including a MAC layer block written in Python. The implemented capabilities include several channel estimation methods, a noise power spectral density estimator and an adaptive bit loading algorithm. We make all the software components available as an open source project to facilitate further development by the broader research community. We then show experimental results obtained with the system applied to a vehicle harness and a real vehicle powerline network. In the first part of the experiments, we demonstrate the correctness of the implementation, compare between several channel estimation methods, and test the system performance. In the second part, we examine the feasibility of reliable communication with IEEE 1901 over powerlines in a car. Our experiments show that IEEE 1901 along with the implemented receiver algorithm are capable of operating in the scenarios tested. The vehicular impulsive noise is identified as the primary cause for errors. In particular, our experiments show that it affects mainly the frame synchronization. Hence we believe that further investigations of in-vehicle powerline communication should focus on alleviating the effect of impulse noise on synchronization.Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate
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Stegman, Jason Karl. "Wideband and Narrowband Spectrum Sensing Methods Using Software Defined Radios." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1469.
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The ability to accurately sense the surrounding wireless spectrum, without having any prior information about the type of signals present, is an important aspect for dynamic spectrum access and cognitive radio. Energy detection is one viable method, however its performance is limited at low SNR and must adhere to Nyquist sampling theorem. Compressive sensing has emerged as a potential method to recover wideband signals using sub-Nyquist sampling rates, under the presumption that the signals are sparse in a certain domain. In this study, the performance and some of the practical limitations of energy detection and compressive sensing are compared via simulation, and also implementation using the Universal Software Radio Peripheral (USRP) software defined radio (SDR) platform. The usefulness and simplicity of the USRP and GNU Radio software toolkit for simulation and experimentation, as well as some other application areas of compressive sensing and SDR, is also discussed.
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Don, Michael L. "A Low-Cost Software-Defined Telemetry Receiver." International Foundation for Telemetering, 2015. http://hdl.handle.net/10150/596410.
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ITC/USA 2015 Conference Proceedings / The Fifty-First Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2015 / Bally's Hotel & Convention Center, Las Vegas, NVThe Army Research Laboratories has developed a PCM/FM telemetry receiver using a low-cost commercial software-defined radio (SDR). Whereas traditional radio systems are implemented in hardware, much of the functionality of software-defined radios is defined in software. This gives them the flexibility to accommodate military telemetry standards as well as other specialized functions. After a brief review of telecommunication theory, this paper describes the receiver implementation on a commercial SDR platform. Data rates up to 10 Mbs were obtained through the customization the SDR's field programmable gate array.
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Fayez, Almohanad Samir. "Design Space Decomposition for Cognitive and Software Defined Radios." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23180.
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Software Defined Radios (SDRs) lend themselves to flexibility and extensibility because theydepend on software to implement radio functionality. Cognitive Engines (CEs) introduce
intelligence to radio by monitoring radio performance through a set of meters and configuring
the underlying radio design by modifying its knobs. In Cognitive Radio (CR) applications,
CEs intelligently monitor radio performance and reconfigure them to meet it application
and RF channel needs. While the issue of introducing computational knobs and meters
is mentioned in literature, there has been little work on the practical issues involved in
introducing such computational radio controls.
This dissertation decomposes the radio definition to reactive models for the CE domain
and real-time, or dataflow models, for the SDR domain. By allowing such design space
decomposition, CEs are able to define implementation independent radio graphs and rely on
a model transformation layer to transform reactive radio models to real-time radio models
for implementation. The definition of knobs and meters in the CE domain is based on
properties of the dataflow models used in implementing SDRs. A framework for developing
this work is presented, and proof of concept radio applications are discussed to demonstrate
how CEs can gain insight into computational aspects of their radio implementation during
their reconfiguration decision process.
Ph. D.
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Mirabella, Mirko. "Implementazione software-defined radio di sistemi di telecomunicazione digitali." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
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In questo elaborato di tesi viene presentata la progettazione e l’implementazione su hardware di sistemi di telecomunicazione digitali, applicando il paradigma della Software Defined Radio. Questo tipo di approccio offre notevoli vantaggi in termini di flessibilità, costi e tempi per la realizzazione dei sistemi di interesse. Ulteriore elemento innovativo è rappresentato dall’utilizzo della metodologia di sviluppo Model Based Design. Questo tipo di progettazione permette di sviluppare il software non più utilizzando i classici linguaggi di programmazione, come il C o il VHDL, ma interconnettendo, all'interno di un opportuno ambiente di lavoro, blocchi funzionali che eseguono specifiche operazioni. Tutti i progetti proposti sono stati sviluppati in ambiente MATLAB/Simulink, grazie al quale è stato possibile programmare dispositivi Raspberry Pi 2 Model B e FPGA. Oltre alla realizzazione di sistemi dedicati a scopi didattici, verranno descritte anche le funzionalità che Simulinik offre per applicazioni professionali. In particolare, si darà risalto alla generazione automatica di codice VHDL, sulla base del modello progettato in Simulink di un trasmettitore digitale satellitare di seconda generazione.
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Fältström, Johan, and Fredrik Gidén. "LiUMIMO : A MIMO Testbed for Broadband Software Defined Radio." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-18331.
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In order to keep up with the increasing demand on speed and reliability in modern wireless systems, new standards have to be introduced. By using Multiple Input Multiple Output technology (MIMO) and Orthogonal Frequency Division Multiplexing (OFDM) technologies the performance can be increased dramatically. Forthcoming standards such as WLAN 802.11n, WiMax and 3GPP LTE are all taking advantage of MIMO technology. To perform realistic tests with these standards it is often not enough to run software simulations in for example Matlab. Instead, as many real world parameters as possible need to be included. This can be done using a testbed, like the LiUMIMO, that actually transmits and receives data through the air.
The LiUMIMO is designed as a Software Defined Radio (SDR), only the RF front end and the data log are implemented in hardware, while all signal processing will be performed in Matlab.
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Kriegler, Wouter. "A fixed-point DSP architecture for software-defined radio." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/3029.
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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.Due to ever evolving wireless communication standards and technologies, the need for more flexible radio terminals are becoming more sought after in order to adapt to these new standards. Software-defined radio offers a solution to this demand. Software-defined radio is a radio communication system where signal processing components that have typically been implemented in hardware are replaced by reconfigurable and re-useable software modules running on a digital processor. The need exists to rapidly create new SDR applications without designing an entire system from the ground up, and without specialised knowledge of the target platform. This thesis initially describes the design of a generic SDR architecture that is highly reconfigurable and promotes a high level of code re-use. The research forms part of a larger project to design a domain-specific language (DSL) in which to describe SDR functionality in a platform-independent way. In this thesis, the code synthesis from the DSL is extended to support the Freescale DSP563xx family.
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Sanfuentes, Juan L. "Software defined radio design for synchronization of 802.11A receiver." Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/3197.
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Constant improvements in techniques applied to different radio communication system stages, including coding, modulation, synchronization and security, make any implementation quickly obsolete. On the other hand, different communication standards used among military and public safety agencies make difficult the necessary interoperability. These reasons force users to replace equipment frequently, increasing cost and implementation time. Software Defined Radios (SDRs), partly implemented in software, can solve these problems, making full use of programmable modules. This thesis presents an implementation of the necessary algorithms that solve the synchronization requirements of IEEE 802.11a WLAN receivers. This is a continuation of a previous thesis effort, where the post-synchronization steps of the receiver were addressed. The software utilized for this purpose is the Open Source SCA Implementation::Embedded (OSSIE), developed by Virginia Tech. Each algorithm was created as a different component, allowing reuse and modularity for the development of future waveforms.
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Zafeiropoulos, Georgios. "Software defined radio datalink implementation using PC-type computers." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion-image/03sep%5FZafeiropoulos.pdf.
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Thesis (M.S. in Electrical Engineering and M.S. in Systems Engineering)--Naval Postgraduate School, September 2003.Thesis advisor(s): Jovan Lebaric, Curtis Schleher. Includes bibliographical references (p. 187). Also available online.
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Moloudi, Shervin. "An outphasing power amplifier for a software defined radio." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1562153431&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Witkowsky, Jason. "A hardware emulator testbed for a software-defined radio." Thesis, Peninsula Technikon, 2003. http://hdl.handle.net/20.500.11838/1170.
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Submitted in fulfillment of the requirement for the
Masters degree of Technology (MTech): Electrical Engineering, 2003Contemporary software-defined radio (SDR) is continuously changing and challenging the way traditional RF systems operate. Having more of a radio system’s operation in software enables further flexibility through the use of software manipulation. Due to practical limitations, however, it is not always feasible to have the entire radio system’s operations performed using software. Practical limitations, therefore, require that a SDR employs some form of RF front-end in order to interface the antenna signals and the signals prior to the data converters. As technology grows in support of SDR development, this hardware interface is becoming increasingly smaller. The problem with the rapid rate at which SDR developments are occurring is that RF hardware needs to change accordingly. Therefore, the RF hardware front-end can be seen as a non-standardised piece of equipment. To the designer, this means having to prototype in hardware in order to experiment with various types of SDR hardware front-ends. One of a SDR’s main attractions is the inherent property of software testability. Taking this fact into account, this thesis investigates the design and operation of a basic softwaredriven RF front-end emulator for a SDR. Basic prototype software models are identified and developed in order to test their performance within the emulator. The focus of the thesis, however, is geared toward the development of a software architecture that enables a high degree of interchangeability amongst the underlying modelled components. In the case of a SDR, the advantage of prototyping in software is in predicting the behaviour of a system prior to having to perform any physical developments. This property of software testability in the emulator can only fully be appreciated if a bench-mark system is used to evaluate the overall performance of the emulator. Therefore, a physical hardware setup is performed in order to test the basic aspects of the emulators operation. This evaluation is not meant as an exhaustive analysis of the emulator, but aims to highlight the overall performance of the emulated system against a typical physical system setup.
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Wennerholm, Lucas, and Adam Alenius. "Antenna Characterization with Autonomous UAV and Software Defined Radio." Thesis, Uppsala universitet, Signaler och System, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-355444.
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A measurement equipment with the purpose of measuring the radiation pattern of antennas in the frequency interval 30-300 MHz was constructed. To perform the necessary measurements the equipment needs to be mounted on a UAV, a necessity that demands a low weight from the measurement equipment. These kinds of measurements are today done with equipment that is mounted on helicopters, making the equipment smaller and fitting it on an UAV will save cost for the persons or companies that need to utilize this service. To ensure that the system is easy to use for anyone who wants to characterize an antenna efforts were made to make the software application user friendly. The system visualizes measurement results in 2D diagrams that are simple to analyze. Since the equipment has size restrictions the computer in the system needs to be small and light. The single board computer used has computational limitations and therefore the digital signal processing must be carefully designed to both be fast and generate good measurement data. To verify the performance of the system tests and theoretical simulations where performed and compared. The tests were performed both in an echo free antenna chamber and in realistic outdoor environments with an UAV. The finished system performed well and the measurement results showed clear similarities with the theoretical simulations. The outdoor environment clearly influences the shape of an antennas radiation pattern and the need to characterize antennas in a realistic environment became clear.
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Kumar, Sumit. "Architecture for simultaneous multi-standard software defined radio receiver." Electronic Thesis or Diss., Sorbonne université, 2019. http://www.theses.fr/2019SORUS160.
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Motivés par les capacités du SDR, nous théorisons dans ce travail un récepteur de définition radio multi-standard simultané (SMS-SDR). Un récepteur SMS-SDR sera capable de décoder "simultanément" les informations de plusieurs standards sans fil hétérogènes utilisant le même frontal RF. Nos réseaux cibles sont des réseaux à accès aléatoire fonctionnant dans des bandes sans licence. Ces normes fonctionnent sans coordination centralisée et sont soumises à de graves brouillage entre canaux du même type de technologie (CT-CCI) car leurs bandes de fréquences de fonctionnement se chevauchent. Nous développons plusieurs nouveaux algorithmes de traitement du signal en bande de base afin d'éliminer l'ICC des récepteurs à une et plusieurs antennes. Nous avons choisi le cas de l'utilisation de signaux à bande étroite et à large bande, en accordant une attention particulière aux systèmes basés sur OFDM, l'OFDM étant une technique de couche physique essentielle des normes sans fil modernes telles que les familles IEEE 802.11 et 4G. Au cours du développement, nous nous concentrons sur les méthodes pouvant fonctionner de manière autonome dans le récepteur, c'est-à-dire sans aucune coopération de la part de l'émetteur ou de la station de base. De cette manière, ce sont des réseaux à accès aléatoire appropriés fonctionnant dans des bandes sans licence. De plus, les algorithmes peuvent être intégrés à l'infrastructure existante sans aucun effort significatif. Enfin, nos méthodes d'atténuation des interférences sont utilisées pour développer des arbres de décision qui recommandent la séquence d'étapes permettant d'atténuer les interférences entre deux signaux hétérogènes. Enfin, nous avons validé nos algorithmes en les implémentant à l'aide de SDRMotivated by the capabilities of the SDR, we theorize in this work a simultaneous multi-standard radio definition receiver (SMS-SDR). An SMS-SDR receiver will be able to "simultaneously" decode the information of several heterogeneous wireless standards using the same RF front end. Our target networks are random access networks operating in unlicensed bands. These standards operate without centralized coordination and are subject to serious interference between channels of the same type of technology (CT-CCI) because their operating frequency bands overlap. We are developing several new baseband signal processing algorithms to eliminate ICC from single and multi-antenna receivers. We chose the case of the use of narrow-band and broadband signals, paying particular attention to OFDM-based systems, OFDM being an essential physical layer technique of modern wireless standards such as IEEE families 802.11 and 4G. During development, we focus on methods that can operate autonomously in the receiver, that is, without any cooperation from the transmitter or base station. In this way, they are appropriate random access networks operating in unlicensed bands. In addition, the algorithms can be integrated into the existing infrastructure without any significant effort. Finally, our interference mitigation methods are used to develop decision trees that recommend the sequence of steps to mitigate interference between two heterogeneous signals. Finally, we validated our algorithms by implementing them using SDR
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Cruz, Pedro Miguel Duarte. "Characterization and modelling of software defined radio front-ends." Doctoral thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/11306.
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Doutoramento em Engenharia ElectrotécnicaO presente trabalho tem por objectivo estudar a caracterização e modelação de arquitecturas de rádio frequência para aplicações em rádios definidos por software e rádios cognitivos. O constante aparecimento no mercado de novos padrões e tecnologias para comunicações sem fios têm levantado algumas limitações à implementação de transceptores rádio de banda larga. Para além disso, o uso de sistemas reconfiguráveis e adaptáveis baseados no conceito de rádio definido por software e rádio cognitivo assegurará a evolução para a próxima geração de comunicações sem fios. A ideia base desta tese passa por resolver alguns problemas em aberto e propor avanços relevantes, tirando para isso partido das capacidades providenciadas pelos processadores digitais de sinal de forma a melhorar o desempenho global dos sistemas propostos. Inicialmente, serão abordadas várias estratégias para a implementação e projecto de transceptores rádio, concentrando-se sempre na aplicabilidade específica a sistemas de rádio definido por software e rádio cognitivo. Serão também discutidas soluções actuais de instrumentação capaz de caracterizar um dispositivo que opere simultaneamente nos domínios analógico e digital, bem como, os próximos passos nesta área de caracterização e modelação. Além disso, iremos apresentar novos formatos de modelos comportamentais construídos especificamente para a descrição e caracterização não-linear de receptores de amostragem passa-banda, bem como, para sistemas nãolineares que utilizem sinais multi-portadora. Será apresentada uma nova arquitectura suportada na avaliação estatística dos sinais rádio que permite aumentar a gama dinâmica do receptor em situações de multi-portadora. Da mesma forma, será apresentada uma técnica de maximização da largura de banda de recepção baseada na utilização do receptor de amostragem passa-banda no formato complexo. Finalmente, importa referir que todas as arquitecturas propostas serão acompanhadas por uma introdução teórica e simulações, sempre que possível, sendo após isto validadas experimentalmente por protótipos laboratoriais.
This work investigates the characterization and modeling of radio frequency front-ends for software defined radio and cognitive radio applications. The emergence of new standards and technologies in the wireless communications market are raising several issues to the implementation of wideband transceiver systems. Also, reconfigurable and adaptable systems based on software defined and cognitive radio models are paving the way for the next generation of wireless systems. In this doctoral thesis the fundamental idea is to address the particular open issues and propose appropriate advancements by exploring and taking profit from new capabilities of digital signal processors in a way to improve the overall performance of the novel schemes. Receiver and transmitter strategies for radio communications are summarized by concentrating on the usability for software defined radio and cognitive radio systems. Available instrumentation and next steps for analog and digital radio frequency hardware characterization is also discussed. Wideband behavioral model formats are proposed for nonlinear description and characterization of bandpass sampling receivers, as well as, for multi-carrier nonlinear systems operation. The proposed models share a great flexibility and have the freedom to be simply expanded to other fields. A new design for receiver dynamic range improvement in multi-carrier scenarios is proposed, which is supported on the useful wireless signals statistical evaluation. Additionally, receiver-side bandwidth maximization based on higher-order bandpass sampling approaches is evaluated. All the proposed designs and modeling strategies are accompanied by theoretical backgrounds and simulations whenever possible, being then experimentally validated by laboratory prototypes.
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Ojur, Barbara Apili. "Low cost and portable software defined radio ground station." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30943.
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Small satellites are being launched by a multitude of private and public organizations around the world. They are innately cheaper than their large counterparts. This attribute, and additional ones, such as their easy-to-assemble nature and the convenience of using commercially available off-the-shelf parts to build them has enhanced their popularity. Now that getting into space has become more accessible there is an influx of information available from small satellites, however the information is not being utilized too efficiently on Earth. One reason as to why this is evident is because traditional ground stations, which are largely hardware dependent, are expensive to develop. However, with the introduction of Software Defined Radios (SDRs) many of the operations formerly done using hardware can now be implemented in software. Using a SDR can substantially reduce the cost of a traditionally hardware-based ground station. A number of universities and other organizations have or are developing SDR ground stations to communicate with satellites in different orbits. The ability to receive or transmit signals is important because it displays the capability to develop and operate satellites to various stakeholders. This dissertation attempted to enhance the movement towards satellite communication using SDR technology by developing a low cost, portable, easy to assemble and extendable ground station at the University of Cape Town in order to make contact with one or more small satellites in Low Earth Orbit (LEO), to encourage data usage, national and international collaboration and education. The ground station was constructed and tested based on its objectives, requirements and constraints. The commissioning tests were conducted in the SpaceLab at the University of Cape Town. The ground station was able to make contact with two small satellites in LEO successfully. Packets were received from two satellites that clearly stated who they were. The information contained in the packets was decoded into ASCII text and Hex code. They were compared with other successful amateur ground station results from all over the world to verify their authenticity. The main conclusion was that the SDR ground station was able to make contact with small satellites in LEO operating in the 70-cm band.
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Faust, Oliver. "A self-reconfigurable system for software defined radio (SRS)." Thesis, University of Aberdeen, 2005. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU214414.
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This document introduces a Self-Reconfigurable system for Software defined radio (SR.S). The SRS is a modular processing platform which extends an ordinary PC system with Software Defined Radio capabilities. It consists of several daughter cards and one main board. The daughter cards connect the main board to external entities such as an analogue front end and the PC system. The main board hosts a single processor which executes signal processing algorithms and interfaces to external entities. The PC system controls which algorithms the processor executes and if necessary it initiates an algorithm change during runtime. The SRS system uses a reconfigurable architecture for the processor on the main board. This architecture provides a mechanism known as runtime reconfiguration to change the functionality or parts of the functionality of the processor. The PC system communicates with one part of the reconfigurable processor. This part reconfigures the signal processing part of the processor if the PC1 system initiates an algorithm change. I call this mechanism partial self-reconfiguration. Several components within the reconfigurable processor abstract the interfacing and signal processing tasks. The processor executes these components in parallel. I used a design methodology based on formal methods to design this component network. To be specific. I employed a model checker to validate a Communicating Sequential Processes (CSP) model of the component network. In a second step this CSP model was translated into hardware description code. The reconfigurable processor accelerates the baseband algorithms of digital communication standards. I studied the baseband algorithms which define the Orthogonal Frequency Division Multiplex (OFDM) modulation scheme. These algorithms have specific processing requirements. The specific-processor for the main board was selected based on the processing requirements of these algorithms. The SRS processing platform copes with the increasing algorithm complexity, higher demands for energy efficiency and flexibility. The modular system design provides a great deal of connection flexibility. This actually extends the idea of Software Defined Radio to wire or bus standards, i.e. software defines the bus standard. At the same time, formal methods ensure that the design, which defines the functionality of the reconfigurable processor, is reliable. Moreover, formal methods describe architecture and functionality of the system in a very compact manner. This provides the opportunity to document a hardware system completely. The OFDM algorithms provide a. deep insight into modern digital algorithms and how to accelerate these algorithms in a parallel architecture. This insight is necessary to draw up the specification for the system design. The functionality of the reconfigurable processor was created with a design methodology based on formal methods. Compared with standard design methodologies the incorporation of formal methods speeds up the design process and the results are more reliable. The SRS system executes digital communication algorithms. Time and frequency synchronisation algorithms are amongst the most demanding, because they require realtime processing and they are very complex. The OFDM time and frequency synchronisation algorithms were improved with a technique called multi-rate signal processing. In a nutshell, multi-rate signal processing allows increased the time resolution and therefore it is possible to track a signal with finer steps.
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Gadgil, Kalyani Surendra. "Performance Benchmarking Software-Defined Radio Frameworks: GNURadio and CRTSv.2." Thesis, Virginia Tech, 2020. http://hdl.handle.net/10919/97568.
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In this thesis, we benchmark the Cognitive Radios Test System version 2.0 (CRTSv.2) to analyze its software performance with respect to its internal structure and design choices. With the help of system monitoring and profiling tools, CRTSv.2 is tested to quantitatively evaluate its features and understand its shortcomings. With the help of GNU Radio, a popular, easy-to-use software radios framework, we ascertain that CRTSv.2 has a low memory footprint, fewer dependencies and overall, is a lightweight framework that can potentially be used for real-time signal processing. Several open-source measurement tools such as valgrind, perf, top, etc. are used to evaluate the CPU utilization, memory footprint and to postulate the origins of latencies. Based on our evaluation, we observe that CRTSv.2 shows a CPU utilization of approximately 9% whereas GNU Radio is 59%. CRTSv.2 has lower heap memory consumption of approximately 3MB to GNU Radio's 25MB. This study establishes a methodology to evaluate the performance of two SDR frameworks systematically and quantitatively.Master of Science
When picking the best person for the job, we rely on the person's performance in past projects of a similar nature. The same can be said for software. Software radios provide the capability to perform signal processing functions in software, making them prime candidates towards solving modern problems such as spectrum scarcity, internet-of-things(IoT) adoption, vehicle-to-vehicle communication etc. In order to operate and configure software radios, software frameworks are provided that let the user make changes to the waveform, perform signal processing and data management. In this thesis, we consider two such frameworks,GNU Radio and CRTSv.2. A software performance evaluation is conducted to assess framework overheads contributing to operation of an orthogonal frequency-division multiplexing (OFDM) digital modulation scheme. This provides a quantitative analysis of a signals-specific use case which can be used by researchers to evaluate the optimal framework for research. This analysis can be generalized for different signal processing capabilities by understanding the total framework overhead removed from signal processing costs.