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Dissertations / Theses on the topic 'Software Defined Radio (SDR)'

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Published: 4 June 2021
Last updated: 1 June 2024

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1

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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2

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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3

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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4

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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5

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.
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6

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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7

Gu, Haohao, and He Zhang. "Implementation of CMMB System using Software Defined Radio (SDR) Platform." Thesis, Linköping University, Computer Engineering, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57310.

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CMMB (China Multimedia Mobile Broadingcasting) is a wireless broadcastingchannel standard for low bandwidth, low cost hand-held digital TV is adopted byall continental Chinese government TV broadcasting companies and some HongKong private TV broadcasting companies. The business potential is high, yet thefuture is hard to predict because it might be replaced by GB200600 or DTMB. Thedigital modulation is based on OFDM with pilot supporting channel estimationand equalization and CP supporting multi-path induced ISI problems.This thesis investigates the implement a CMMB system using a SDR platform.Simulation chain was implemented using MATLAB with full data precision includingCMMB transmitter and receiver. The transmitter behavior model includes RSencoder, LDPC encoder, OFDM modulation, etc. The receiver behavior modelincludes OFDM demodulation, channel estimation, channel equalization, LDPCdecoder, RS decoder, etc. Different channel models emulating pathloss, whitenoise, multi-path, and glitch were modeled. Based on the simulation chain andchannel models, T-domain, F-domain channel estimator and equalizer were implemented,optimized. Optimized TD-FD models for different mobility scenarioswere proposed. The focus of the thesis is on 2D (FD-TD) channel estimation andequalization.

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8

Putthapipat, Pasd. "Lightweight Middleware for Software Defined Radio (SDR) Inter-Components Communication." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/867.

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The ability to use Software Defined Radio (SDR) in the civilian mobile applications will make it possible for the next generation of mobile devices to handle multi-standard personal wireless devices and ubiquitous wireless devices. The original military standard created many beneficial characteristics for SDR, but resulted in a number of disadvantages as well. Many challenges in commercializing SDR are still the subject of interest in the software radio research community. Four main issues that have been already addressed are performance, size, weight, and power. This investigation presents an in-depth study of SDR inter-components communications in terms of total link delay related to the number of components and packet sizes in systems based on Software Communication Architecture (SCA). The study is based on the investigation of the controlled environment platform. Results suggest that the total link delay does not linearly increase with the number of components and the packet sizes. The closed form expression of the delay was modeled using a logistic function in terms of the number of components and packet sizes. The model performed well when the number of components was large. Based upon the mobility applications, energy consumption has become one of the most crucial limitations. SDR will not only provide flexibility of multi-protocol support, but this desirable feature will also bring a choice of mobile protocols. Having such a variety of choices available creates a problem in the selection of the most appropriate protocol to transmit. An investigation in a real-time algorithm to optimize energy efficiency was also performed. Communication energy models were used including switching estimation to develop a waveform selection algorithm. Simulations were performed to validate the concept.
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9

Maheshwarappa, Mamatha R. "Software defined radio (SDR) architecture for concurrent multi-satellite communications." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813388/.

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SDRs have emerged as a viable approach for space communications over the last decade by delivering low-cost hardware and flexible software solutions. The flexibility introduced by the SDR concept not only allows the realisation of concurrent multiple standards on one platform, but also promises to ease the implementation of one communication standard on differing SDR platforms by signal porting. This technology would facilitate implementing reconfigurable nodes for parallel satellite reception in Mobile/Deployable Ground Segments and Distributed Satellite Systems (DSS) for amateur radio/university satellite operations. This work outlines the recent advances in embedded technologies that can enable new communication architectures for concurrent multi-satellite or satellite-to-ground missions where multi-link challenges are associated. This research proposes a novel concept to run advanced parallelised SDR back-end technologies in a Commercial-Off-The-Shelf (COTS) embedded system that can support multi-signal processing for multi-satellite scenarios simultaneously. The initial SDR implementation could support only one receiver chain due to system saturation. However, the design was optimised to facilitate multiple signals within the limited resources available on an embedded system at any given time. This was achieved by providing a VHDL solution to the existing Python and C/C++ programming languages along with parallelisation so as to accelerate performance whilst maintaining the flexibility. The improvement in the performance was validated at every stage through profiling. Various cases of concurrent multiple signals with different standards such as frequency (with Doppler effect) and symbol rates were simulated in order to validate the novel architecture proposed in this research. Also, the architecture allows the system to be reconfigurable by providing the opportunity to change the communication standards in soft real-time. The chosen COTS solution provides a generic software methodology for both ground and space applications that will remain unaltered despite new evolutions in hardware, and supports concurrent multi-standard, multi-channel and multi-rate telemetry signals.
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10

Wright, Durke A. "Field programmable gate array (FPGA) based software defined radio (SDR) design." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/March/09Mar%5FWright.pdf.

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Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, March 2009.
Thesis Advisor(s): Kragh, Frank ; Loomis, Herschel. "March 2009." Description based on title screen as viewed on April 24, 2009. Author(s) subject terms: Software Defined Radio, SDR, Field Programmable Gate Array, FPGA, Signal Compression. Includes bibliographical references (p. 105-106). Also available in print.
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11

Allen, Matthew S. "Performance Assessment of Model-Driven FPGA-based Software-Defined Radio Development." Digital WPI, 2014. https://digitalcommons.wpi.edu/etd-theses/943.

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"This thesis presents technologies that integrate field programmable gate arrays (FPGAs), model-driven design tools, and software-defined radios (SDRs). Specifically, an assessment of current state-of-the-art practices applying model-driven development techniques targeting SDR systems is conducted. FPGAs have become increasingly versatile computing devices due to their size and resource enhancements, advanced core generation, partial reconfigurability, and system-on-a-chip (SoC) implementations. Although FPGAs possess relatively better performance per watt when compared to central processing units (CPUs) or graphics processing units (GPUs), FPGAs have been avoided due to long development cycles and higher implementation costs due to significant learning curves and low levels of abstraction associated with the hardware description languages (HDLs). This thesis conducts a performance assessment of SDR designs using both a model-driven design approach developed with Mathworks HDL Coder and a hand-optimized design approach created from the model-driven VHDL. Each design was implemented on the FPGA fabric of a Zynq-7000 SoC, using a Zedboard evaluation platform for hardware verification. Furthermore, a set of guidelines and best practices for applying model-driven design techniques toward the development of SDR systems using HDL Coder is presented."
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12

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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13

Scaperoth, David Alan. "Configurable SDR Operation for Cognitive Radio Applications using GNU Radio and the Universal Software Radio Peripheral." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/32961.

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With interoperability issues plaguing emergency responders throughout the country, Cognitive Radio (CR) offers a unique solution to streamline communication between police, Emergency Medical Technicians (EMT), and military officers. Using Software Defined Radio (SDR) technology, a flexible radio platform can be potentially configured using a Cognitive Engine (CE) to transmit and receive many different incompatible radio standards. In this thesis, an interface between a Cognitive Engine and an SDR platform is described which modifies (i.e., configures) the radioâ s operation. The interface is based upon communicating information via eXtensible Markup Language (XML) data files that contain the radioâ s Physical (PHY) parameters. The XML data files have been designed such that more development can be made to its structure as this research develops. The GNU Radio and the Universal Software Radio Peripheral (USRP) serve as the SDR platform for an example implementation. The example implementation involves importing XML data files into the SDR for quick configuration. Three configuration examples are used to describe this process.
Master of Science
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Швець, Валеріян Анатолійович, Volodymyr Kondratiuk, Svitlana Ilnytska, and Oleksandr Kutsenko. "Radionavigation field monitoring in the landing area using software-defined radio receiver." Thesis, National Aviation University, 2018. http://er.nau.edu.ua/handle/NAU/36846.

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15

Михальський, Володимир Миколайович. "Метод нейромережевого керування системою адаптивного радіозв’язку Software Defined Radio." Магістерська робота, Хмельницький національний університет, 2020. http://elar.khnu.km.ua/jspui/handle/123456789/9499.

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Дипломна робота присвячена розгляду питань керування системою SDR шляхом розпізнавання видів цифрової модуляції, виконується системою, яка автоматично класифікує вид цифрової модуляції одержуваного сигналу.
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Holstensson, Oskar. "Study of Interferer Canceling Systems in a Software Defined Radio Receiver." Thesis, Linköpings universitet, Institutionen för systemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-92757.

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This thesis describes the work related to an interferer rejection system employing frequency analysis and cancellation through phase-opposed signal injection. The first device in the frequency analysis chain, an analog fast Fourier transform application-specific integrated circuit (ASIC), was improved upon. The second device, a chained fast Fourier transform followed by a frequency analysis module employing cross-correlation for signal detection was specified, designed and implemented in VHDL.
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17

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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18

Wang, Qi. "Study of Channel Estimation in MIMO-OFDM for Software Defined Radio." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-10128.

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The aim of the thesis is to find out the most suitable channel estimation algorithms for the existing MIMO-OFDM SDR platform. Starting with the analysis of several prevalent channel estimation algorithms, MSE performance are compared under different scenarios. As a result of the hardware independent analysis, the complexvalued matrix computations involved in the algorithms are decomposed to real FLoating-point OPerations (FLOPs). Four feasible algorithms are selected for hardware dependent discussion based on the proposed hardware architecture. The computational latency is exposed as a manner of case study.

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19

Al-Saffar, Dina A. H. "SIMO/MIMO body-centric space-time diversity over software-defined radio." Thesis, Loughborough University, 2018. https://dspace.lboro.ac.uk/2134/32153.

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This thesis is germane to body-centric communication measurements and analyses at different frequency bands. It presents measurements and analyses of the radio channels for humans. This research contains a novel and comprehensive study of body-centric single input multiple output (SIMO) diversity. This has included the analyses of diversity techniques with off-body communications in different settings within indoor environments. The objectives in this research are; investigating the benefits of using multiple antennas for off-body and on-body channels and studying the performance of diversity antennas for off-body in different environments with both genders. A further novel aspect of this thesis has been concerned with off-body channel characteristics using software defined radio (SDR) and LabVIEW using different modulation schemes for measurements and analyses. This method combines processing and control in software, paired with SDR for the over the air interface. The combination of SDR and LabVIEW is shown to provide a platform to facilitate experiments in the presence of humans that is useful for prototyping different types of radio channels. This method also gives a new aspect for a novel treatment of a 2x2 body-centric multiple input multiple output (MIMO) system. It is shown how the difficulties associated with implementing MIMO systems can be overcome by using SDR combined with LabVIEW. Studying the effects of water in the body-centric communication channels are also a new area of research presented here. This work has shown how water encapsulated within Polyacrylamide gel can be exploited as a cheap and available material to enhance the performance of on-body antennas. It is shown that water gives 1–3dB enhancements from the measurements of SIMO and MIMO systems with the human presence.
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20

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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21

Podosinov, Volodymyr Sergiyovich. "A Hybrid DSP and FPGA System for Software Defined Radio Applications." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/31810.

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Modern devices provide a multitude of services that use radio frequencies in continual smaller packages. This size leads to an antenna used to transmit and receive information being usually very inefficient and a lot of power is wasted just to be able to transmit a signal. To mitigate this problem a new antenna was introduced by Dr. Manteghi that is capable of working efficiently across a large band. The antenna achieves this large band by doing quick frequency hopping across multiple channels. In order to test the performance of this antenna against more common antennas, a software radio was needed, such that tested antennas can be analyzed using multiple modulations. This paper presents a software defined radio system that was designed for the purpose of testing the bit-error rate of digital modulations schemes using described and other antennas. The designed system consists of a DSP, an FPGA, and commercially available modules. The combination allows the system to be flexible with high performance, while being affordable. Commercial modules are available for multiple frequency bands and capable of fast frequency switching required to test the antenna. The DSP board contains additional peripherals that allows for more complex projects in the future. The block structure of the system is also very educational as each stage of transmission and reception can be tested and observed. The full system has been constructed and tested using simulated and real signals. A code was developed for communication between commercial modules and the DSP, bit error rate testing, data transmission, signal generation, and signal reception. A graphical user interface (GUI) was developed to help user with information display and system control. This thesis describes the software-defined-radio design in detail and shows test results at the end.
Master of Science
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22

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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23

Schmidt-Knorreck, Carina. "Architectures radio-logicielles appliquées aux réseaux véhiculaires." Thesis, Paris, ENST, 2012. http://www.theses.fr/2012ENST0057/document.

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Répondre aux contraintes des architectures reconfigurables pour des systèmes véhiculaires n'est pas toujours une tâche aisée. Des solutions existent dans le domaine de la radio logicielle où des plateformes flexibles qui prennent en charge un large éventail de différentes standards de communication sans fil peuvent être conçus. Une de ces architectures est la plateforme ExpressMIMO qui est développée par Eurecom et Télécom ParisTech. Les objectifs principales de cette thèse sont de proposer le premier prototype d'un récepteur pour ExpressMIMO, d'évaluer le potentiel de la plateforme pour les standards ayant des latences critiques, d'identifier des goulots d'étranglement et de proposer des solutions pour surmonter ces limitations. Comme standard, IEEE 802.11p a été choisi qui spécifie la communication entre des véhicules. Au-delà, nous étudions une possible exécution multimodal du 802.11p et du DAB sur ExpressMIMO. Notre analyse lors des expérimentations sur une cible FPGA révèle que le Front-End Processor DSP est lourdement chargé et que le temps de configuration requis dépasse le temps d'exécution. Pour relever ce défi nous proposons un Application Specific Instruction-Set Processor (ASIP) comme solution lorsque les contraintes de latence sont fortes. Pour compléter la chaîne de réception, nous présentons enfin un premier prototype de Préprocesseur qui connecte les convertisseurs A/D et D/A avec les autres composants de la bande de base. Dans ce contexte nous présentons un convertisseur générique et flexible pour le ré-échantillonnage qui travaille sur des rapports fractionnaires de fréquence d'échantillonnage
Dealing with the requirements of reconfigurable radio architectures in the vehicular domain is a very challenging task. Solutions can be found in the context of Software Defined Radio (SDR). Under its umbrella, flexible hardware platforms that support a wide range of different wireless communication standards are designed. One of them is the OpenAirInterface ExpressMIMO platform that is developed by Eurecom and Télécom ParisTech. Main objectives of this thesis are to propose the first receiver chain prototype for ExpressMIMO, to assess the applicability of the platform for latency critical standards, to identify design bottlenecks and to propose and implement solutions to overcome the identified limitations. Standard of interest in this context is IEEE 802.11p which is required for the Car-to-Car communication. Our analysis reveals that the Front-End Processing (FEP) DSP engine is heavily charged and that the required configuration time outreaches the pure execution time for short vectors. To meet this challenge we introduce an Application Specific Instruction-Set Processor (ASIP) as the solution of choice when dealing with strong latency requirements. To complete the receiver chain we further present a first Preprocessor prototype which connects the external A/D and D/A converters with the remaining baseband engine. In this context we focus on a generic, flexible and hardware optimized Sample Rate Converter (SRC) that is operating on fractional ratios. As the combination of Car-to-Car and Car-to-Infrastructure communications within only device enables various new applications for future cars we finally investigate on a possible multimodal execution of 802.11p and DAB on the chosen target platform
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24

Skärpe, Anders. "Implementation of an SDR in Verilog." Thesis, Linköpings universitet, Kommunikationssystem, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-132325.

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This report presents an implementation of the software part in a software definedradio. The radio is not entirely implemented in software and therefore there arecertain limitations on the received signal. The parts implemented are oscillator,decimation filter, carrier synchronization, time synchronization, package detection,and demodulation. Different algorithms were tested for the different partsto measure the power consumption. To understand how the number of bits usedto represent the signal affects the power consumption, the number of bits wasreduced from 20 bits to 10 bits. This reduction reduced the power consumptionfrom 2.57mW to 1.89mW. A small change in the choice of algorithms was thenmade which reduced the power consumption to 1.86mW. Then the clock rate wasreduced for some parts of the system which reduced the power consumption to1.05mW.
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25

Gul, Sufi Tabassum. "Optimization of Multi-standards Software Defined Radio Equipments: A Common Operators Approach." Phd thesis, Université Rennes 1, 2009. http://tel.archives-ouvertes.fr/tel-00446230.

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La technique de paramétrisation est très prometteuse pour la conception radio logicielle. La radio logicielle consiste à concevoir des systèmes multi-standards qui tirent bénéfice des possibilités de programmation ou de reconfiguration offertes par les composants de traitement la constituant. Cette thèse étudie la technique de paramétrisation par opérateurs communs. Les opérateurs communs sont des unités de traitements communes à plusieurs opérations qu'effectue un équipement, quelle que soit la couche du modèle OSI à laquelle elles appartiennent. La méthode proposée repose sur une approche théorique afin de résoudre le problème de conception d'un équipement multi-standards. Elle consiste en une optimisation d'un hypergraphe. La conception de l'équipement est représentée par des opérateurs à différents niveaux de granularité dans un graphe acyclique orienté. Le niveau le plus élevé représente une approche de conception d'équipements multi-standards de type Velcro. Plus les opérateurs sont bas dans le graphe, plus leur coût est faible en termes de complexité, mais plus il faut faire appel de fois à eux pour effectuer des opérations de différentes sortes. Nous décrivons ensuite en tant qu'exemples des conception basées sur les opérateurs DMFFT (dual mode FFT), LFSR (linear feedback shift register) et le cas du FRMFB (frequency response masking filter bank). Les solutions basées sur les opérateurs communs proposées dans cette thèse peuvent contribuer à optimiser la conception des futurs équipements multi-standards de radio logicielle qui devront supporter de nombreux standards de communication sans fil.
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26

Ferreira, Nathan. "An Assessment of Available Software Defined Radio Platforms Utilizing Iterative Algorithms." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/728.

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As the demands of communication systems have become more complex and varied, software defined radios (SDR) have become increasingly popular. With behavior that can be modified in software, SDR's provide a highly flexible and configurable development environment. Despite its programmable behavior, the maximum performance of an SDR is still rooted in its hardware. This limitation and the desire for the use of SDRs in different applications have led to the rise of various pieces of hardware to serve as SDR platforms. These platforms vary in aspects such as their performance limitations, implementation details, and cost. In this way the choice of SDR platform is not solely based on the cost of the hardware and should be closely examined before making a final decision. This thesis examines the various SDR platform families available on the market today and compares the advantages and disadvantages present for each during development. As many different types of hardware can be considered an option to successfully implement an SDR, this thesis specifically focuses on general purpose processors, system on chip, and field-programmable gate array implementations. When examining these SDR families, the Freescale BSC9131 is chosen to represent the system on chip implementation, while the Nutaq PicoSDR 2x2 Embedded with Virtex6 SX315 is used for the remaining two options. In order to test each of these platforms, a Viterbi algorithm is implemented on each and the performance measured. This performance measurement considers both how quickly the platform is able to perform the decoding, as well as its bit error rate performance in order to ascertain the implementations' accuracy. Other factors considered when comparing each platform are its flexibility and the amount of options available for development. After testing, the details of each implementation are discussed and guidelines for choosing a platform are suggested.
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27

Hedlund, Richard. "Design of a UAV-based radio receiver for avalanche beacon detection using software defined radio and signal processing." Thesis, Uppsala universitet, Signaler och System, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-377025.

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A fully functional proof of concept radio receiver for detecting avalanche beacons atthe frequency 457 kHz was constructed in the work of this master thesis. The radioreceiver is intended to be mounted on an unmanned aerial vehicle (UAV or drone)and used to aid the mountain rescue teams by reducing the rescue time in findingavalanche victims carrying a transmitting beacon. The main parts of this master thesisinvolved hardware requirement analysis, software development, digital signalprocessing and wireless communications. The radio receiver was customized to receive low power signal levels becausemagnetic antennas are used and the avalanche beacon will operate in the reactive nearfield of the radio receiver. Noise from external sources has a significant impact on theperformance of the radio receiver. This master thesis allows for straightforward further development and refining of theradio receiver due to the flexibility of the used open-source software development kitGNU Radio where the digital signal processing was performed.
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28

Berges, Paul Martin. "Exploring the Vulnerabilities of Traffic Collision Avoidance Systems (TCAS) Through Software Defined Radio (SDR) Exploitation." Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/90165.

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Traffic Collision Avoidance Systems (TCAS) are safety-critical systems that are deployed on most commercial aircraft in service today. However, TCAS transactions were not designed to account for malicious actors. While in the past it may have been infeasible for an attacker to craft arbitrary radio signals, attackers today have access to open-source digital signal processing software like GNU Radio and inexpensive Software Define Radios (SDR). Therefore, this thesis presents motivation through analytical and experimental means for more investigation into TCAS from a security perspective. Methods for analyzing TCAS both qualitatively and quantitatively from an adversarial perspective are presented, and an experimental attack is developed in GNU Radio to perform an attack in a well-defined threat model.
Master of Science
Since 1993, the Federal Aviation Administration (FAA) requires that many commercial turbine-powered aircraft to be outfitted with an on-board mid-air collision mitigation system. This system is known as the Traffic Collision Avoidance System (TCAS) in the United States, and it is known as the Airborne Collision Avoidance System (ACAS) in other parts of the world. TCAS/ACAS is a type of safety-critical system, which means that implementations need to be highly tolerant to system failures because their operation directly affects the safety of the on-board passengers and crew. However, while safety-critical systems are tolerant to failures, the designers of these systems only account for failures that occur in a cooperative environment; these engineers fail to account for “bad actors” who want to attack the weaknesses of these systems, or they assume that attacking such a system is infeasible. Therefore, to demonstrate how safety-critical systems like TCAS/ACAS are vulnerable to such bad actors, this thesis presents a method for manipulating the TCAS/ACAS in the favor of a bad actor. To start, a method for qualitatively and quantitatively analyzing the system’s vulnerabilities is presented. Then, using Software Defined Radio (SDR), which is a free and open-source effort to combine the flexibility of software with the power of wireless communication, this thesis shows how an actor can craft wireless signals such that they appear to look like an aircraft on a collision course with a target.
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Athari, Emad, and Petter Lerenius. "Design and implementation of an SDR receiver for the VHF band." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8386.

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The purpose of this thesis work is to examine the possibility of building a software-defined radio (SDR) for the VHF-band. The goal is to accomplish this with as few components as possible, thus cutting down the size and the production cost.

An SDR solution means that the sampling of the signal is done as close to the antenna as possible. The wide bandwidth needed in such a product is achieved by using SP Devices algorithm for time-interleaved ADCs. Two hardware prototypes and two versions of the software were designed and implemented using this technology.

They were also analyzed within this thesis work. The results proved to be good, and the possibilities to produce a commercial software-defined radio receiver for the VHF-band are good.


Syftet med det här examensarbetet är att utreda möjligheten att bygga en mjukvarustyrd radiomottagare (SDR) för VHF-bandet. Målet är att göra detta genom att använda så få komponenter som möjligt, och därigenom minska storleken och produktionskostnaden.

En SDR lösning ger att samplingen kommer att ske så nära antennen som möjligt. Den stora bandbredd som behövs för en sådan produkt uppnås genom att använda SP Devices algoritm för att ''tidsinterleava'' höghastighets ADC:er. Två hårdvaruprototyper och två versioner av mjukvaran har designats och implementerats.

Analyserna har visat bra resultat, och möjligheterna att bygga en komersiell mjukvarudefinierade radiomottagare för VHF-bandet ses som goda.

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30

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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31

Hosseininejad, Bijan. "Design and Implementation of a Versatile Wireless Communication System via Software Defined Radio." Connect to resource online, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1252413668.

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32

Alluri, Veerendra Bhargav. "MULTIPLE CHANNEL COHERENT AMPLITUDE MODULATED (AM) TIME DIVISION MULTIPLEXING (TDM) SOFTWARE DEFINED RADIO (SDR) RECEIVER." UKnowledge, 2008. http://uknowledge.uky.edu/gradschool_theses/499.

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It is often required in communication and navigation systems to be able to receive signals from multiple stations simultaneously. A common practice to do this is to use multiple hardware resources; a different set of resources for each station. In this thesis, a Coherent Amplitude Modulated (AM) receiver system was developed based on Software Defined Radio (SDR) technology enabling reception of multiple signals using hardware resources needed only for one station. The receiver system architecture employs Time Division Multiplexing (TDM) to share the single hardware resource among multiple streams of data. The architecture is designed so that it can be minimally modified to support any number of stations. The Verilog Hardware Description Language (HDL) was used to capture the receiver system architecture and design. The design and architecture are initially validated using HDL post-synthesis and post-implementation simulation. In addition, the receiver system architecture and design were implemented to a Xilinx Field Programmable Gate Array (FPGA) technology prototyping board for experimental testing and final validation.
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33

Mannar, Mannan Pallavi. "FRAMEWORK FOR THE DESIGN AND IMPLEMENTATION OF SOFTWARE DEFINED RADIO BASED WIRELESS COMMUNICATION SYSTEM." University of Akron / OhioLINK, 2005. http://rave.ohiolink.edu/etdc/view?acc_num=akron1133295152.

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34

Jamison, James. "Leveraging Software-Defined Radio for a Scalable Wide-band Wireless Channel Measurement System." ScholarWorks @ UVM, 2018. https://scholarworks.uvm.edu/graddis/969.

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Wireless channel characterization is important for determining both the requirements for a wireless system and its resulting reliability. Wireless systems are becoming ever more pervasive and thus are expected to operate in increasingly more cluttered environments. While these devices may be fixed in location, the channel is still far from ideal due to multipath. Under such conditions, it is desirable to have a means of taking wireless channel measurements in a low-cost and distributed manner, which is not always possible using typical channel measurement equipment. This thesis leverages a software-defined radio (SDR) platform to perform wideband wireless channel measurements. Specifically, the system can measure the scalar frequency response of a wireless channel in a distributed manner and provides measurements with an average mean-squared error of 0.018 % σ and a median error not exceeding 0.631 dB when compared to measurements taken with a vector network analyzer. This accuracy holds true in a highly multipath environment, with a measurement range of ~40 dB. The system is also capable of scaling to multiple wireless links which will be measured simultaneously (up to three links are demonstrated). After validating the measurement system, a measurement campaign is undertook using the system in a highly multipath environment to demonstrate a possible application of the system.
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35

Smith, Travis R. "Comparing RF Fingerprinting Performance of Hobbyist and Commercial-Grade SDRs." Wright State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=wright1608139109925131.

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36

Manco, Angelo, and Vittorio U. Castrillo. "Design of Basic Receiving Functions for an SDR Based Communication System." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581820.

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The paper focuses on the design and implementation of the base-band basic receiving functions, for a binary CP-FSK demodulator pilot study, as independent modules of a complete Reconfigurable Data-Link (RDL). A model-based approach and Software Defined Radio (SDR) paradigm are used for the design. The implementation will be executed on Field-Programmable Gate Array (FPGA) based hardware.
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37

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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38

Dorni, Aljoša. "IEEE 802.11 Networks: MAC Protocols for Heterogeneous Multi-Antenna Scenarios and Software-Defined Radio PHY Layer Implementation." Doctoral thesis, Università degli studi di Trieste, 2013. http://hdl.handle.net/10077/8538.

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2011/2012
The objective of this thesis is to discuss the performance achieved by IEEE 802.11 networks, considering in detail their simulation and experimental analysis, as well as the implementation aspects. The original contribution of this dissertation involves three main research fields within the context of distributed wireless networks: the experimental and theoretical analysis of IEEE 802.11e networks in presence of quality of service mechanisms, the development and the simulation of backward compatible medium access control protocols in presence of smart antenna systems, and, finally, the implementation of the IEEE 802.11ag physical layer on software-defined radio platforms.
L’obiettivo di questa tesi è discutere le prestazioni ottenibili nelle reti IEEE 802.11, prendendo in considerazione sia la loro simulazione ed analisi sperimentale, sia gli aspetti implementativi. Il contributo originale di questa tesi include tre argomenti principali che riguardano le reti wireless distribuite: l’analisi sperimentale e teorica delle reti 802.11e che adottano meccanismi di qualità del servizio, lo sviluppo e la simulazione di schemi di accesso multiplo retrocompatibili basati sull’utilizzo di sistemi di antenne intelligenti, e, infine, l’implementazione su piattaforme software-defined radio del livello fisico 802.11ag.
XXV Ciclo
1980
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39

Bauer, Zachary Obenour. "A Calibration Method for a Controlled Reception Pattern Antenna and Software Defined Radio Configuration." Ohio University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1357402542.

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40

Dabcevic, Kresimir. "Evaluation of Software Defined Radio platform with respect to implementation of 802.15.4 Zigbee." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-12564.

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With the development of powerful computational resources such as Digital Signal Processors and Field Programmable Gate Arrays, It has become possible to utilize many radio functions via software. This is the main concept of an up-and-coming technology of Software Defined Radio. In the Thesis, a number of platforms for implementation of Software Defined Radio has been evaluated. Platform that proved to be most suitable for the project was Ettus’ USRP N210. Using the platform, implementation of 802.15.4 Zigbee’s physical layer was done, where experiments whose outputs can later be used to compare performance with respect to "hardware radios" were performed.
Med utvecklingen av enheter med kraftfulla beräkningsegenskaper som “Digital Signal Processors” och “Field Programmable Gate Arrays” har det blivit möjligt att implementera flera radiofunktioner i mjukvara. Det är huvudkonceptet i den uppåtgående teknologin mjukvaru definierad radio.I det här examensarbetet har ett flertal plattformar för mjukvaru definierad radioutvärderats. Plattformen som visade sig vara mest lämplig för projektet var Ettus USRP N210. En implementation av IEEE 802.15.4 Zigbees fysiska lager har realiserats till plattformen. Experiment, vars utdata senare kan användas för att jämföra prestanda mellan mjukvaru definierad radio och hårdvaru baserad radio, har även utförts.
TESLA - Time-critical and Safe wireLess Automation communication
GAUSS - Guaranteed Automation communication Under Severe disturbanceS
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41

Goavec-Merou, Gwenhael. "Générateur de coprocesseur pour le traitement de données en flux (vidéo ou similaire) sur FPGA." Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2056/document.

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L’utilisation de matrice de portes logiques reconfigurables (FPGA) est une des seules solutionspour traiter des flux de plusieurs 100 MÉchantillons/seconde en temps-réel. Toutefois, ce typede composant présente une grande difficulté de mise en oeuvre : au delà d’un type langage spécifique,c’est tout un environnement matériel et une certaine expérience qui sont requis pourobtenir les traitements les plus efficaces. Afin de contourner cette difficulté, de nombreux travauxont été réalisés dans le but de proposer des solutions qui, partant d’un code écrit dans unlangage de haut-niveau, vont produire un code dans un langage dédié aux FPGAs. Nos travaux,suivant l’approche d’assemblage de blocs et en suivant la méthode du skeleton, ont visé à mettreen place un logiciel, nommé CoGen, permettant, à partir de codes déjà développés et validés,de construire des chaînes de traitements en tenant compte des caractéristiques du FPGA cible,du débit entrant et sortant de chaque bloc pour garantir l’obtention d’une solution la plus adaptéepossible aux besoins et contraintes. Les implémentations des blocs de traitements sont soitgénérés automatiquement soit manuellement. Les entrées-sorties de chaque bloc doivent respecterune norme pour être exploitable dans l’outil. Le développeur doit fournir une descriptionconcernant les ressources nécessaires et les limitations du débit de données pouvant être traitées.CoGen fournit à l’utilisateur moins expérimenté une méthode d’assemblage de ces blocsgarantissant le synchronisme et cohérence des flux de données ainsi que la capacité à synthétiserle code sur les ressources matérielles accessibles. Cette méthodologie de travail est appliquéeà des traitements sur des flux vidéos (seuillage, détection de contours et analyse des modespropres d’un diapason) et sur des flux radio-fréquences (interrogation d’un capteur sans-fils parméthode RADAR, réception d’un flux modulé en fréquence, et finalement implémentation deblocs de bases pour déporter le maximum de traitements en numérique)
Using Field Programmable Gate Arrays (FPGA) is one of the very few solution for real time processingdata flows of several hundreds of Msamples/second. However, using such componentsis technically challenging beyond the need to become familiar with a new kind of dedicateddescription language and ways of describing algorithms, understanding the hardware behaviouris mandatory for implementing efficient processing solutions. In order to circumvent these difficulties,past researches have focused on providing solutions which, starting from a description ofan algorithm in a high-abstraction level language, generetes a description appropriate for FPGAconfiguration. Our contribution, following the strategy of block assembly based on the skeletonmethod, aimed at providing a software environment called CoGen for assembling various implementationsof readily available and validated processing blocks. The resulting processing chainis optimized by including FPGA hardware characteristics, and input and output bandwidths ofeach block in order to provide solution fitting best the requirements and constraints. Each processingblock implementation is either generated automatically or manually, but must complywith some constraints in order to be usable by our tool. In addition, each block developer mustprovide a standardized description of the block including required resources and data processingbandwidth limitations. CoGen then provides to the less experienced user the means to assemblethese blocks ensuring synchronism and consistency of data flow as well as the ability to synthesizethe processing chain in the available hardware resources. This working method has beenapplied to video data flow processing (threshold, contour detection and tuning fork eigenmodesanalysis) and on radiofrequency data flow (wireless interrogation of sensors through a RADARsystem, software processing of a frequency modulated stream, software defined radio)
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42

Björklund, Daniel. "Implementation of a Software-Defined Radio Transceiver on High-Speed Digitizer/Generator SDR14." Thesis, Linköpings universitet, Elektroniksystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-78213.

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This thesis describes the specification, design and implementation of a software-defined radio system on a two-channel 14-bit digitizer/generator. The multi-stage interpolations and decimations which are required to operate two analog-to-digital converters at 800 megasamples per second (MSps) and two digital-to-analog converters at 1600 MSps from a 25 MSps software-side interface, were designed and implemented. Quadrature processing was used throughout the system, and a combination of fine-tunable low-rate mixers and coarse high-rate mixers were implemented to allow frequency translation across the entire first Nyquist band of the converters. Various reconstruction filter designs for the transmitter side were investigated and a cheap implementation was done through the use of programmable base-band filters and polynomial approximation.
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43

Marunganti, Murali Krishna. "Experimental Study of Cooperative Communication using Software Defined Radios." Cleveland State University / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=csu1293249850.

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44

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 they
depend 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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45

Schmidt, Robert. "Slicing in heterogeneous software-defined radio access networks." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS525.

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Les réseaux 5G sont envisagés comme un changement de paradigme vers des réseaux orientés services. Dans cette thèse, nous étudions comment combiner efficacement le découpage en tranches et le SD-RAN afin de fournir le niveau requis de flexibilité et de programmabilité dans l'infrastructure RAN pour réaliser des réseaux multi-locataires orientés services. Premièrement, nous concevons une abstraction d'une station de base pour représenter les stations de base logiques et décrire un service de réseau virtualisé. Deuxièmement, nous proposons une nouvelle plateforme SD-RAN conforme aux normes, appelée FlexRIC, sous la forme d'un kit de développement logiciel (SDK). Troisièmement, nous fournissons une conception modulaire pour un cadre d'ordonnancement MAC tenant compte des tranches afin de gérer et de contrôler efficacement les ressources radio dans un environnement multiservice avec un support de qualité de service (QoS). Enfin, nous présentons une couche de virtualisation SD-RAN dynamique basée sur le SDK FlexRIC et le cadre d'ordonnancement MAC pour composer de manière flexible une infrastructure SD-RAN multiservice et fournir une programmabilité pour de multiples contrôleurs SD-RAN
5G networks are envisioned to be a paradigm shift towards service-oriented networks. In this thesis, we investigate how to efficiently combine slicing and SD-RAN to provide the required level of flexibility and programmability in the RAN infrastructure to realize service-oriented multi-tenant networks. First, we devise an abstraction of a base station to represent logical base stations and describe a virtualized network service. Second, we propose a novel standard-compliant SD-RAN platform, named FlexRIC, in the form of a software development kit (SDK). Third, we provide a modular design for a slice-aware MAC scheduling framework to efficiently manage and control the radio resources in a multi-service environment with quality-of-service (QoS) support. Finally, we present a dynamic SD-RAN virtualization layer based on the FlexRIC SDK and MAC scheduling framework to flexibly compose a multi-service SD-RAN infrastructure and provide programmability for multiple SD-RAN controllers
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Giannoulis, Georgios. "Efficient implementation of filtering and resampling operations on Field Programmable Gate Arrays (FPGAs) for Software Defined Radio (SDR)." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Dec/08Dec%5FGiannoulis.pdf.

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Thesis (M.S. in Electrical Engineering and M.S. in Applied Mathematics)--Naval Postgraduate School, December 2008.
Thesis Advisor(s): Cristi, Roberto ; Rasmussen, Craig W. "December 2008." Description based on title screen as viewed on January 29, 2009. Includes bibliographical references (p. 61). Also available in print.
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47

Monk, Andrew Michael. "Exploration into the Use of a Software Defined Radio as a Low-Cost Radar Front-End." BYU ScholarsArchive, 2020. https://scholarsarchive.byu.edu/etd/8742.

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Inspection methods for satellites post-launch are currently expensive and/or dangerous. To address this, BYU, in conjunction with NASA, is designing a series of small satellites called CubeSATs. These small satellites are designed to be launched from a satellite and to visually inspect the launching body. The current satellite revision passively tumbles through space and is appropriately named the passive inspection cube satellite (PICS). The next revision actively maintains translation and rotation relative to the launching satellite and is named the translation, rotation inspection cube satellite (TRICS). One of the necessary sensors aboard this next revision is the means to detect distance. This work explores the feasibility of using a software defined radio as a small, low-cost front end for a ranging radar to fulfill this need. For this work, the LimeSDR-Mini is selected due to its low-cost, small form factor, full duplex operation, and open-source hardware/software. Additionally, due to the the channel characteristics of space, the linear frequency modulated continuous-wave (LFMCW) radar is selected as the radar architecture due to its ranging capabilities and simplicity. The LFMCW radar theory and simulation are presented. Two programming methods for the LimeSDR-Mini are considered: GNU Radio Companion and the pyLMS7002Soapy API. GNU Radio Companion is used for initial exploration of the LimeSDR-Mini and confirms its data streaming (RX and TX) and full duplex capabilities. The pyLMS7002Soapy API demonstrates further refined control over the LimeSDR-Mini while providing platform independence and deployability. This work concludes that the LimeSDR-Mini is capable of acting as the front end for a ranging radar aboard a small satellite provided the pyLMS7002Soapy API is used for configuration and control. GNU Radio Companion is not recommended as a programming platform for the LimeSDR-Mini and the pyLMS7002Soapy API requires further research to fine tune the SDR's performance.
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48

Boström, Henrik. "An FPGA implementation of a digital FM modulator." Thesis, Linköpings universitet, Elektroniksystem, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-70241.

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The increase in speed and density of programmable logic devices such as Field Programmable Gate Arrays (FPGA) enables ever more complex designs to be constructed within a short time frame. The flexibility of a programmable device eases the integration of a design with a wide variety of components on a single chip. Since Frequency Modulation (FM) is an analog modulation scheme, performing it in the digital domain introduces new challenges. The details of these challenges and how to deal with them are also explained. This thesis presents the design of a digital stereo FM modulator including necessary signal processing, such as filtering, waveform generation, stereo multiplexing etc. The solution is comprised of code written in Very high speed integrated circuit Hardware Description Language (VHDL) and a selection of free Intellectual Property (IP)-blocks and is intended for implementation on a Xilinx FPGA. The focus of the thesis lies on area efficiency and a number of suggestions are given to maximize the number of channels that can be modulated using a single FPGA chip. An estimation of how many channels that can be modulated usingthe provided FPGA, Xilinx XC6SXL100T, is also presented.
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49

Taj, Muhammad Imran. "Network on chip based multiprocessor system on chip for wireless software defined cognitive radio." Phd thesis, Université Paris-Est, 2011. http://pastel.archives-ouvertes.fr/pastel-00665786.

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Software Defined Radio (SDR) and Cognitive Radio (CR) are entering mainstream. These high performance and high adaptability requiring devices with agile frequency operations hold promise to :1. address the inconsistency between hardware and software advancements, 2. real time mode switching from one radio configuration to another and3. efficient spectrum management in under-utilized spectrum bands. Framed within this statement, in this thesis we have implemented a SDR waveform on 16 Processing Element (PE) Network on chip (NoC) based general purpose Multiprocessors System on chip (MPSoC), with access to four external DDR2 memory banks, which is implemented on a single chip Xilinx Virtex-4 FPGA. We shifted short term development of a waveform into software domain by designing an efficient parallelization and synchronization strategy for each waveform component, individually. We enhance our designed waveform functionality by proposing and implementing three Artificial Neural Networks Schemes : Self Organizing Maps, Linear Vector Quantization and Multi-Layer Perceptrons as effective techniques for reconfiguring CR Transceiver after recognizing the specific standard based on input parameters, pertaining to different layers, extracted from the signal. Our proposed adaptive solution switches to appropriate Artificial Neural Network, based on the features of input signal sensed. We designed an efficient synchronization and parallelization strategy to implement the Artificial Neural Networks based CR Transceiver Algorithms on the aforementioned MPSoC chip. The speed up we obtained for our SDR waveform and CR Transceiver algorithms demonstrated that the general purpose MPSoC devices are the most efficient answer to the acquisition challenge for major organizations that invest or plan to invest in SDR and CR based devices, thereby allowing us to avoid expensive hardware accelerators. We address the case of a complex signal composed of many modulated carriers by dividing the PEs in individual groups, thus received signal with more than one Standard is processed efficiently. We add further functionality in our designed Multi-standard CR Transceiver possessing SDR Waveform by proposing a new approach for radio spectrum management, perhaps the most important aspect of CR. We make our designed waveform Spectrum efficient by modelling the primary user signal Radio Frequency features as a multivariate time series, which is then given as input to Elman Recurrent Neural Network that predicts the evolution of Radio Frequency Time Series to decide if the secondary user can exploit the Spectrum band. We exploit the inherent cyclostationary in primary signals for Non-linear Autoregressive Exogenous Time Series Modeling of Radio Frequency features, as predicting one RF feature needs the previous knowledge of other relevant RF features. We observe a similar trend between predicted and actual values. Ensemble, our designed Spectrum Efficient SDR waveform with a Universal Multi-standard Transceiver answers the SDR and CR performance requirements under resource constraints by efficient algorithm design and implementation using lateral thinking that seeks a greater cross-domain interaction
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50

Anderson, Christopher R. "A Software Defined Ultra Wideband Transceiver Testbed for Communications, Ranging, or Imaging." Diss., Virginia Tech, 2006. http://hdl.handle.net/10919/29026.

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Impulse Ultra Wideband (UWB) communications is an emerging technology that promises a number of benefits over traditional narrowband or broadband signals: extremely high data rates, extremely robust operation in dense multipath environments, low probability of intercept/detection, and the ability to operate concurrently with existing users. Unfortunately, most currently available UWB systems are based on dedicated hardware, preventing researchers from investigating algorithms or architectures that take advantage of some of the unique properties of UWB signals. This dissertation outlines the development of a general purpose software radio transceiver testbed for UWB signals. The testbed is an enabling technology that provides a development platform for investigating ultra wideband communication algorithms (e.g., acquisition, synchronization, modulation, multiple access), ranging or radar (e.g., precision position location, intrusion detection, heart and respiration rate monitoring), and could potentially be used in the area of ultra wideband based medical imaging or vital signs monitoring. As research into impulse ultra wideband expands, the need is greater now than ever for a platform that will allow researchers to collect real-world performance data to corroborate theoretical and simulation results. Additionally, this dissertation outlines the development of the Time-Interleaved Analog to Digital Converter array which served as the core of the testbed, along with a comprehensive theoretical and simulation-based analysis on the effects of Analog to Digital Converter mismatches in a Time-Interleaved Sampling array when the input signal is an ultra wideband Gaussian Monocycle. Included in the discussion is a thorough overview of the implementation of both a scaled-down prototype as well as the final version of the testbed. This dissertation concludes by evaluating the of the transceiver testbed in terms of the narrowband dynamic range, the accuracy with which it can sample and reconstruct a UWB pulse, and the bit error rate performance of the overall system.
Ph. D.
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