Dissertations / Theses: 'Software defined receiver'

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Kusters, Joseph Matthew. "A software-defined receiver for laser communications using a GPU." Thesis, Massachusetts Institute of Technology, 2018. https://hdl.handle.net/1721.1/121598.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018 Cataloged from PDF version of thesis. Includes bibliographical references (pages 43-46). Laser commiunication systems provide a high data rate, power efficient communication solution for small satellites and deep space missions. One challenge that limits the widespread use of laser communication systems is the lack of accessible, low-complexity receiver electronics and software implementations. Graphics Processing Units (GPUs) can reduce the complexity in receiver design since GPUs require less specialized knowledge and can enable faster development times than Field Programmnable Cate Array (FPGA) implementations, while still retaining comparable data throughputs via parallelization. This thesis explores the use of a Graphics Processing Unit (GPU) as the sole computational unit for the signal processing algorithms involved in laser conmnunications. by Joseph Matthew Kusters. M. Eng. M.Eng. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science

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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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Nor, Azlan bin Mohd Aris. "Development of Software-Defined Multichannel Receiver for Equatorial Atmosphere Radar (EAR)." Kyoto University, 2020. http://hdl.handle.net/2433/253426.

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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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Jetti, Sirish B. "An object oriented MATLAB software defined Global Positioning System (GPS) receiver." Connect to online resource, 2008. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1456693.

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Zhang, Chen. "An ECA-Based ZigBee Receiver." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/31516.

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Element CXI's Elemental Computing Array (ECA) delivers faster reconfiguration time and higher computational density than Field Programmable Gate Arrays (FPGAs) with similar computational power. It provides higher computational power than Digital Signal Processors (DSPs) with similar power consumption and price. It also utilizes a library-based graphical development environment promoting ease of use and fast development. In this thesis, the design and implementation of a ZigBee receiver on an Element CXI ECA-64 platform is presented. The ZigBee receiver is evaluated through simulations and implementation on an ECA device. During the design and implementation of the ZigBee receiver, some design experience and tips are concluded. The design methodology on the ECA is studied in detail to assure the implementationâ s correctness, since the methodology of the ECA is different from that of other platforms. Master of Science

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Shetye, Kalpesh Anil. "Design and implementation of a software defined radio receiver for AM band." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/SHETYE_KALPESH_58.pdf.

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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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Reed, Rachel E. "Real-Time Implementation and Analysis of Chip Shape-based Software Defined Receiver." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1493634316594274.

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Mikkelsen, Eivind Brauer. "The Design of a Low Cost Beacon Receiver System using Software Defined Radio." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9984.

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Due to increase in ship traffic and activities related to oil and gas there is currently grate interest in the northern regions of Norway. Satellite communications to these areas i.e. north of the polar circle is however challenging due to low elevation angles and restricted visibility of geostationary satellites. Limited work has been done to study the propagation effects at theses latitudes and low elevation angles, especially at millimeter frequencies and for maritime communications. Some measurements have been conducted at Svalbard [5] and in Canada [5.1]. The studies from Svalbard were conducted at Ku-band frequencies whilst the Canadian measurements were conducted at 38 GHz. Non of the two did however include maritime measurements. Further measurements are therefore needed to characterize the propagation effects under these conditions. A beacon receiver is radio which is used to detect and measure the signal strength of a transmitted radio beacon signal. Beacon signals transmitted by satellites are often low power continuous wave signals intended for antenna steering and power control purposes. These signals are well suited for propagation measurement due to their constant transmits power and frequency. Propagation research often relies on beacon measurements along with other information such as weather data and radiometer readings. This thesis discusses the design and implementation of a low cost beacon receiver based on digital signal processing techniques and software defined radio. The intention was originally to design a Ka-band (20 GHz) receiver. This was however extended to a general purpose beacon receiver intended to operate at an L-band intermediate frequency. Different architectures and realizations are discussed with emphasis on costs and performance. It is shown that a 1.2 m antenna, receiving a Ka-band beacon with, 9 dBW EIRP would produce a signal level of about -130 dBm at its output. This would in turn yield a C/N0 ratio of about 46 dBHz at 76°North, assuming a receiver with overall noise figure of 1.5 dB and clear air conditions. Based on the link budget calculations two different beacon receiver designs are proposed. One based on the superheterodyne receiver architecture realized with standard RF-components such as mixers and amplifiers with coaxial connectors. The second design is based on the universal software radio peripheral, (USRP), which is a software radio, intended to allow personal computers function as radio transceivers. It was found that building a complete beacon receiver from standard RF-components would require about 100.000 NOK to achieve the wanted performance. This includes a complete system with antenna, front-end and baseband receiver. Due to the relatively inexpensive hardware (4900 NOK) of the USRP and the availability of front-end plug inn boards in the required intermediate frequency range the USRP was chosen as the hardware portion of the receiver. Linearity measurments and observations of the USRP output spectrum shows a linear dynamic range of about 60 dB which is found sufficient for beacon measurements. A Ku-band antenna intended for television reception has been used to receive a 12.2 GHz beacon transmitted by Eutelsat W3A Software code was developed based on the GNU radio framework in order to use the USRP as a beacon receiver. A number of issues were discovered during this work: GNU radio does not contain filters for spectral averaging Attempts to implement additional functionality in software proved challenging due to limitations in computational speed Both of the two issues affected the performance of the beacon receiver. Modifications and additions to the GNU radio software is therefore suggested for future work

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Bagheri, Rahim. "An 800-MHz to 6-GHz CMOS software-defined-radio receiver for mobile terminals." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1320960921&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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Rastogi, Ashita. "ANALYSIS OF ANOMALOUS GLOBAL POSITIONING SYSTEM RECEIVER DATA." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1171647235.

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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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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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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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Karve, Mrudula Prabhakar. "Evaluation of GNU Radio Platform Enhanced for Hardware Accelerated Radio Design." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/36405.

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The advent of software radio technology has enabled radio developers to design and imple- ment radios with great ease and flexibility. Software radios are effective in experimentation and development of radio designs. However, they have limitations when it comes to high- speed, high-throughput designs. This limitation can be overcome by introducing a hardware element to the software radio platform. Enhancing GNU Radio for Hardware Accelerated Radio Design project implements such a scheme by augmenting an FPGA co-processor to a conventional GNU Radio flow. In this thesis, this novel platform is evaluated in terms of performance of a radio design, as well as hardware and software system requirements. A simple and efficient Zigbee receiver design is presented. Implementation of this receiver is used as a proof-of-concept for the effectiveness and design methodology of the modified GNU Radio. This work also proposes a scheme to extend this idea for design of ultra-wideband radio systems based on multiband-OFDM. Master of Science

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Parker, Peter, John Nelson, and Mark Pippitt. "An Open Systems Architecture for Telemetry Receivers." International Foundation for Telemetering, 2012. http://hdl.handle.net/10150/581819.

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An open systems architecture (OSA) is one in which all of the interfaces are fully defined, available to the public, and maintained according to a group consensus. One approach to achieve this is to use modular hardware and software and to buy commercial, off-the-shelf and commodity hardware. Benefits of an OSA include providing easy access to the latest technological advances in both hardware and software, enabling net-centric operations, and allowing a flexible design that can easily change as the needs of customers may change. This paper will provide details of an OSA system designed for a telemetry receiver and list the benefits of OSA for the telemetry community.

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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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Gong, Fei. "Front End Circuit Module Designs for A Digitally Controlled Channelized SDR Receiver Architecture." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1322606039.

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Blais, Antoine. "Feasibility of a Direct Sampling Dual-Frequency SDR Galileo Receiver for Civil Aviation." Phd thesis, Toulouse, INPT, 2014. http://oatao.univ-toulouse.fr/14271/1/Blais.pdf.

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This thesis studies the relevance of DS SDR architectures applied to Galileo receivers in the specific context of Civil Aviation, characterized in particular by strict requirements of robustness to interference, in particular, interference caused by DME or CW signals. The Software Defined Radio concept renders the major tendency, inside the receiver, to move the demodulation part from an analog technology to digital signal processing, that is software. The choice of this kind of design is nearly generalized in new receiver architectures so it was considered the case in this work. The Direct Sampling method consists in digitizing the signal as close as possible to the antenna, typically after the LNA and the associated RF bandpass filter. So this technique does not use any conversion to an intermediate frequency, using as much as possible the bandpass sampling principle in order to minimize the sampling frequency and consequently the downstream computational costs. What is more, this thesis aiming at the greatest simplification of the analog part of the receiver, the decision was made to suppress the analog AGC which equips the receivers of classical architecture. Only fixed gained amplifiers should precede the ADC. This document exposes the work done to determine if these choices can apply to a multifrequency (E5a and E1 signals) Galileo receiver intended for a Civil Aviation use. The structure of the document reflects the approach used during this thesis. It progresses step by step from the antenna down to the digital signal, to be processed then by the SDR part. After an introduction detailing the problem to study and its context, the second chapter investigates the Civil Aviation requirements of robustness to interference a satellite navigation receiver must comply with. It is the basis which completely conditions the design process. The third chapter is devoted to the determination of the sampling frequency. Two sampling architectures are proposed: the first implements coherent sampling of the two E5a and E1 bands while the second uses separate sampling. In both cases the necessity to use extra RF filters is shown. The minimum attenuation to be provided by these filters is also specified. These requirements are strong enough to justify a feasibility investigation. It is the subject of chapter four where an experimental study, based on a SAW filter chip available on the shelf, is related. The issue of the sampling clock jitter, of concern with the Direct Sampling technique because of the high frequency of the signal to digitize, is investigated in chapter five. Some simulation results are presented and a dimensioning of the quality of the sampling clock is proposed. In chapter six, quantization, a byproduct of digitization, is detailed. Precisely it is the calculation of the number of bits the ADC must have to digitally represent the whole dynamic of, not only the useful signal, but also of the potential interference. Considering the high binary throughput highlighted in chapters three and six, chapter seven evaluates the possibility to reduce the coding dynamic of the digital signal at the output of the ADC by means of compression functions. The last chapter is focused on the digital separation of the two E5a and E1 bands in the coherent sampling architecture presented in chapter two. Here also specifications of minimum attenuation are given. Lastly the conclusions synthesize the contributions of this thesis and proposes ideas for future work to enrich them and more generally the subject of DS-SDR Galileo receivers for Civil Aviation.

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Gunawardena, Sanjeev. "DEVELOPMENT OF A TRANSFORM-DOMAIN INSTRUMENTATION GLOBAL POSITIONING SYSTEM RECEIVER FOR SIGNAL QUALITY AND ANOMALOUS EVENT MONITORING." Ohio University / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1178558967.

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Mehrez, Hanen. "Interface Radio SDR pour récepteur GNSS multi constellations pour la continuité de positionnement entre l’intérieur et l’extérieur." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLL008/document.

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Dans le but d’améliorer la disponibilité des services fournis par un récepteur, la conception d’un récepteur GNSS permettant de recevoir plusieurs signaux de toutes les bandes simultanément semble être la solution. Une architecture à sous échantillonnage RF optimisée de type SDR (Software Defined Radio) comportant un étage RF intégrable et reconfigurable et un étage de traitement numérique avec une implémentation logicielle du traitement en bande de base est défini pour ce récepteur GNSS, tout en répondant aux exigences des spécifications des standards GNSS : des réseaux radio cellulaires : GPS, Glonass, Galileo, Beidou. Un choix des composants discrets suite au dimensionnement system est effectué et ceci pour installer un prototype de validation expérimental. Ensuite nous nous s’intéressons à la caractérisation de la chaine RF afin d’étudier les limitations causés par la non linéarité et d’étudier la stabilité du prototype proposé. Un étage de traitement numérique des signaux IF, capturés à la sortie de l’ADC, est implémenté sous Matlab. L’acquisition de ces données permet la détermination des satellites visible à un instant donné qui nous permet éventuellement la détermination d’une position In order to improve the availability of services provided by a receiver, designing a GNSS receiver to collect multiple signals from all bands simultaneously seems to be the solution. An optimized software-defined RF (SDR) sub-sampling architecture with an integral and reconfigurable RF stage and a digital processing stage with a software implementation of the baseband processing is defined for this GNSS receiver, while meeting the requirements GNSS standards specifications: cellular radio networks: GPS, Glonass, Galileo, Beidou. Many discrete components are selected after system dimensioning. Thus, experimental validation prototype is installed. Then we are interested in the characterization of the RF front-end in order to determine the limitations caused by the nonlinearity and to study the stability of the proposed prototype. A stage of digital processing of the IF signals, captured at the ADC output, is implemented under Matlab software. The acquisition of these data allows the determination of satellites visible at a given instant that allows us to determine a position

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Mikhemar, Mohyee. "Interference cancellation in software-defined CMOS receivers." Diss., Restricted to subscribing institutions, 2010. http://proquest.umi.com/pqdweb?did=2026903671&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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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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Haghighitalab, Delaram. "Récepteur radio-logicielle hautement numérisé." Thesis, Paris 6, 2015. http://www.theses.fr/2015PA066443.

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Aujourd'hui, il y a une augmentation du nombre de normes étant intégré dans des appareils mobiles. Les problèmes principaux sont la durée de vie de la batterie et la taille de l'appareil. L'idée d'un Radio-Logiciel est de pousser le processus de numérisation aussi près que possible de l'antenne. Dans cette thèse, nous présentons la première mise en œuvre d'un récepteur radio-logiciel complet basé sur Sigma-Delta RF passe-bande, y compris un LNA à gain variable (VGLNA), un ADC Sigma-Delta RF sous-échantillonné, un mélangeur bas-conversion RF numérique et un filtre de décimation polyphasé multi-étage multi-taux. Le VGLNA élargit la gamme dynamique du récepteur multi-standard pour atteindre les exigences des trois normes sans fil ciblées. Aussi une architecture mixte, en utilisant à la fois Source-Coupled Logic (SCL) et des circuits CMOS, il est proposé d'optimiser la consommation des circuits RF numériques. Par ailleurs, nous proposons une architecture de filtre en peigne à plusieurs étages avec décomposition polyphase à réduire la consommation d'énergie. Le récepteur est mesuré pour trois normes différentes dans la bande de 2.4 GHz, la bande ISM. Les résultats des mesures montrent que le récepteur atteint 79 dB, 73 dB et 63 dB de plage dynamique pour les normes Bluetooth, ZigBee et WiFi respectivement. Le récepteur complet, mis en œuvre dans le procédé CMOS 130 nm, a une fréquence centrale accordable de 300 MHz et consomme 63 mW sous 1.2 V. Comparé à d'autres récepteurs, le circuit proposé consomme 30% moins d'énergie, la plage dynamique est de 21 dB supérieur, IIP3 est de 6 dB supérieur et le facteur de mérite est de 24 dB supérieur Nowadays there is an increase in the number of standards being integrated in mobile devices. The main issues are battery life and the size of the device. The idea of a Software Defined Radio is to push the digitization process as close as possible to the antenna. Having most of the circuit in the digital domain allows it to be reconfigurable thus requiring less area and power consumption. In this thesis, we present the first implementation of a complete SDR receiver based on RF bandpass Sigma-Delta including a Variable-Gain LNA (VGLNA), an RF subsampled Sigma-Delta ADC, an RF digital down-conversion mixer and a polyphase multi-stage multi-rate decimation filter. VGLNA enlarges the dynamic range of the multi-standard receiver to achieve the requirements of the three targeted wireless standards. Also a mixed architecture, using both Source-Coupled Logic (SCL) and CMOS circuits, is proposed to optimize the power consumption of the RF digital circuits. Moreover, we propose a multi-stage comb filter architecture with polyphase decomposition to reduce the power consumption. The receiver is measured for three different standards in the 2.4 GHz ISM-band. Measurement results show that the receiver achieves 79 dB, 73 dB and 63 dB of dynamic range for the Bluetooth, ZigBee and WiFi standards respectively. The complete receiver, implemented in 130 nm CMOS process, has a 300 MHz tunable central frequency and consumes 63 mW under 1.2 V supply. Compared to other SDR receivers, the proposed circuit consumes 30% less power, the DR is 21 dB higher, IIP3 is 6 dB higher and the overall Figure of Merit is 24 dB higher

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Albu-Rghaif, Ali. "Multi-GNSS signals acquisition techniques for software defined receivers." Thesis, University of Buckingham, 2015. http://bear.buckingham.ac.uk/105/.

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Any commercially viable wireless solution onboard Smartphones should resolve the technical issues as well as preserving the limited resources available such as processing and battery. Therefore, integrating/combining the process of more than one function will free up much needed resources that can be then reused to enhance these functions further. This thesis details my innovative solutions that integrate multi-GNSS signals of specific civilian transmission from GPS, Galileo and GLONASS systems, and process them in a single RF front-end channel (detection and acquisition), ideal for GNSS software receiver onboard Smartphones. During the course of my PhD study, the focus of my work was on improving the reception and processing of localisation techniques based on signals from multi-satellite systems. I have published seven papers on new acquisition solutions for single and multi-GNSS signals based on the bandpass sampling and the compressive sensing techniques. These solutions, when applied onboard Smartphones, shall not only enhance the performance of the GNSS localisation solution but also reduce the implementation complexity (size and processing requirements) and thus save valuable processing time and battery energy. Firstly, my research has exploited the bandpass sampling technique, if being a good candidate for processing multi-signals at the same time. This portion of the work has produced three methods. The first method is designed to detect the GPS, Galileo and GLONASS-CDMA signals’ presence at an early stage before the acquisition process. This is to avoid wasting processing resources that are normally spent on chasing signals not present/non-existent. The second focuses on overcoming the ambiguity when acquiring Galileo-OS signal at a code phase resolution equal to 0.5 Chip or higher and this achieved by multiplying the received signal with the generated sub-carrier frequency. This new conversion saves doing a complete correlation chain processing when compared to conventionally used methods. The third method simplifies the joining implementation of the Galileo-OS data-pilot signal acquisition by constructing an orthogonal signal so as to acquire them in a single correlation chain, yet offering the same performance as using two correlation chains. Secondly, the compressive sensing technique is used to acquire multi-GNSS signals to achieve computation complexity reduction over correlator based methods, like Matched Filter, while still maintaining acquisition integrity. As a result of this research work, four implementation methods were produced to handle single or multi-GNSS signals. The first of these methods is designed to change dynamically the number and the size of the required channels/correlators according to the received GPS signal-power during the acquisition process. This adaptive solution offers better fix capability when the GPS receiver is located in a harsh signal environment, or it will save valuable processing/decoding time when the receiver is outdoors. The second method enhances the sensing process of the compressive sensing framework by using a deterministic orthogonal waveform such as the Hadamard matrix, which enabled us to sample the signal at the information band and reconstruct it without information loss. This experience in compressive sensing led the research to manage more reduction in terms of computational complexity and memory requirements in the third method that decomposes the dictionary matrix (representing a bank of correlators), saving more than 80% in signal acquisition process without loss of the integration between the code and frequency, irrespective of the signal strength. The decomposition is realised by removing the generated Doppler shifts from the dictionary matrix, while keeping the carrier frequency fixed for all these generated shifted satellites codes. This novelty of the decomposed dictionary implementation enabled other GNSS signals to be combined with the GPS signal without large overhead if the two, or more, signals are folded or down-converted to the same intermediate frequency. The fourth method is, therefore, implemented for the first time, a novel compressive sensing software receiver that acquires both GPS and Galileo signals simultaneously. The performance of this method is as good as that of a Matched Filter implementation performance. However, this implementation achieves a saving of 50% in processing time and produces a fine frequency for the Doppler shift at resolution within 10Hz. Our experimental results, based on actual RF captured signals and other simulation environments, have proven that all above seven implementation methods produced by this thesis retain much valuable battery energy and processing resources onboard Smartphones.

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Mehrez, Hanen. "Interface Radio SDR pour récepteur GNSS multi constellations pour la continuité de positionnement entre l’intérieur et l’extérieur." Electronic Thesis or Diss., Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLL008.

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Dans le but d’améliorer la disponibilité des services fournis par un récepteur, la conception d’un récepteur GNSS permettant de recevoir plusieurs signaux de toutes les bandes simultanément semble être la solution. Une architecture à sous échantillonnage RF optimisée de type SDR (Software Defined Radio) comportant un étage RF intégrable et reconfigurable et un étage de traitement numérique avec une implémentation logicielle du traitement en bande de base est défini pour ce récepteur GNSS, tout en répondant aux exigences des spécifications des standards GNSS : des réseaux radio cellulaires : GPS, Glonass, Galileo, Beidou. Un choix des composants discrets suite au dimensionnement system est effectué et ceci pour installer un prototype de validation expérimental. Ensuite nous nous s’intéressons à la caractérisation de la chaine RF afin d’étudier les limitations causés par la non linéarité et d’étudier la stabilité du prototype proposé. Un étage de traitement numérique des signaux IF, capturés à la sortie de l’ADC, est implémenté sous Matlab. L’acquisition de ces données permet la détermination des satellites visible à un instant donné qui nous permet éventuellement la détermination d’une position In order to improve the availability of services provided by a receiver, designing a GNSS receiver to collect multiple signals from all bands simultaneously seems to be the solution. An optimized software-defined RF (SDR) sub-sampling architecture with an integral and reconfigurable RF stage and a digital processing stage with a software implementation of the baseband processing is defined for this GNSS receiver, while meeting the requirements GNSS standards specifications: cellular radio networks: GPS, Glonass, Galileo, Beidou. Many discrete components are selected after system dimensioning. Thus, experimental validation prototype is installed. Then we are interested in the characterization of the RF front-end in order to determine the limitations caused by the nonlinearity and to study the stability of the proposed prototype. A stage of digital processing of the IF signals, captured at the ADC output, is implemented under Matlab software. The acquisition of these data allows the determination of satellites visible at a given instant that allows us to determine a position

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Fujimaki, Akira, Koichi Nakazono, Hiroaki Hasegawa, et al. "Broad Band Software-Defined Radio Receivers Based on Superconductive Devices." IEEE, 2001. http://hdl.handle.net/2237/7077.

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Haghighitalab, Delaram. "Récepteur radio-logicielle hautement numérisé." Electronic Thesis or Diss., Paris 6, 2015. http://www.theses.fr/2015PA066443.

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Aujourd'hui, il y a une augmentation du nombre de normes étant intégré dans des appareils mobiles. Les problèmes principaux sont la durée de vie de la batterie et la taille de l'appareil. L'idée d'un Radio-Logiciel est de pousser le processus de numérisation aussi près que possible de l'antenne. Dans cette thèse, nous présentons la première mise en œuvre d'un récepteur radio-logiciel complet basé sur Sigma-Delta RF passe-bande, y compris un LNA à gain variable (VGLNA), un ADC Sigma-Delta RF sous-échantillonné, un mélangeur bas-conversion RF numérique et un filtre de décimation polyphasé multi-étage multi-taux. Le VGLNA élargit la gamme dynamique du récepteur multi-standard pour atteindre les exigences des trois normes sans fil ciblées. Aussi une architecture mixte, en utilisant à la fois Source-Coupled Logic (SCL) et des circuits CMOS, il est proposé d'optimiser la consommation des circuits RF numériques. Par ailleurs, nous proposons une architecture de filtre en peigne à plusieurs étages avec décomposition polyphase à réduire la consommation d'énergie. Le récepteur est mesuré pour trois normes différentes dans la bande de 2.4 GHz, la bande ISM. Les résultats des mesures montrent que le récepteur atteint 79 dB, 73 dB et 63 dB de plage dynamique pour les normes Bluetooth, ZigBee et WiFi respectivement. Le récepteur complet, mis en œuvre dans le procédé CMOS 130 nm, a une fréquence centrale accordable de 300 MHz et consomme 63 mW sous 1.2 V. Comparé à d'autres récepteurs, le circuit proposé consomme 30% moins d'énergie, la plage dynamique est de 21 dB supérieur, IIP3 est de 6 dB supérieur et le facteur de mérite est de 24 dB supérieur Nowadays there is an increase in the number of standards being integrated in mobile devices. The main issues are battery life and the size of the device. The idea of a Software Defined Radio is to push the digitization process as close as possible to the antenna. Having most of the circuit in the digital domain allows it to be reconfigurable thus requiring less area and power consumption. In this thesis, we present the first implementation of a complete SDR receiver based on RF bandpass Sigma-Delta including a Variable-Gain LNA (VGLNA), an RF subsampled Sigma-Delta ADC, an RF digital down-conversion mixer and a polyphase multi-stage multi-rate decimation filter. VGLNA enlarges the dynamic range of the multi-standard receiver to achieve the requirements of the three targeted wireless standards. Also a mixed architecture, using both Source-Coupled Logic (SCL) and CMOS circuits, is proposed to optimize the power consumption of the RF digital circuits. Moreover, we propose a multi-stage comb filter architecture with polyphase decomposition to reduce the power consumption. The receiver is measured for three different standards in the 2.4 GHz ISM-band. Measurement results show that the receiver achieves 79 dB, 73 dB and 63 dB of dynamic range for the Bluetooth, ZigBee and WiFi standards respectively. The complete receiver, implemented in 130 nm CMOS process, has a 300 MHz tunable central frequency and consumes 63 mW under 1.2 V supply. Compared to other SDR receivers, the proposed circuit consumes 30% less power, the DR is 21 dB higher, IIP3 is 6 dB higher and the overall Figure of Merit is 24 dB higher

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Mailand, Marko. "Systemanalyse und Entwicklung Six-Port basierter Funkempfängerarchitekturen unter Berücksichtigung analoger Störeffekte." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1199900991755-90088.

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Due to the increasing demand of broadband capability and reconfigurability for mobile applications, there is an enormous interest to develop appropriate analog receiver front-ends. In this respect, one promising candidate group is the Six-Port-based direct conversion receiver. The presented work focuses on the investigation of Six-Port-based mobile receiver front-ends with their specific systematical signal processing. Thereby, issues of spurious interfering signals which are generated within the down conversion process of such receivers are of special interest. Based on a comprehensive description of the analog signal processing within additive frequency conversion, a reason could be identified why existing Six-Port receivers have not found any practical application in mobile communication yet – the dynamic DC-offset. With this insight compensation techniques were developed to overcome the negative influences of the dynamic DC-offset. Furthermore, this work presents novel Six-Port-based receiver architectures which, on the one hand, keep the advantages of additive mixing systems like: low power consumption, broadband capability and simplicity of implementation especially for mm-wave transmissions. On the other hand, these novel architectures comprise compensation techniques such that systematically generated spurious signals are inherently compensated in the analog part of the receiver. Moreover, the influence of impairments of phase and amplitude within the IQ-branches of a receiver was investigated. The resulting, unwanted IQ-imbalance was shown to be a mixing method (multiplicative or additive) independent spurious effect. It is suggested to compensate for IQ-imbalance in the digital part of the receiver system. This can be realized with the use of adaptive algorithms. The comparison with conventional analog receiver architectures (especially homodyne receivers) with respect to the reception of today’s and future digitally modulated transmission signals indicate the proposed Six-Port-based receiver architectures to be suitable candidates to fulfill the difficult tasks of modern mobile communication.

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Mailand, Marko. "Systemanalyse und Entwicklung Six-Port basierter Funkempfängerarchitekturen unter Berücksichtigung analoger Störeffekte." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A24036.

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Due to the increasing demand of broadband capability and reconfigurability for mobile applications, there is an enormous interest to develop appropriate analog receiver front-ends. In this respect, one promising candidate group is the Six-Port-based direct conversion receiver. The presented work focuses on the investigation of Six-Port-based mobile receiver front-ends with their specific systematical signal processing. Thereby, issues of spurious interfering signals which are generated within the down conversion process of such receivers are of special interest. Based on a comprehensive description of the analog signal processing within additive frequency conversion, a reason could be identified why existing Six-Port receivers have not found any practical application in mobile communication yet – the dynamic DC-offset. With this insight compensation techniques were developed to overcome the negative influences of the dynamic DC-offset. Furthermore, this work presents novel Six-Port-based receiver architectures which, on the one hand, keep the advantages of additive mixing systems like: low power consumption, broadband capability and simplicity of implementation especially for mm-wave transmissions. On the other hand, these novel architectures comprise compensation techniques such that systematically generated spurious signals are inherently compensated in the analog part of the receiver. Moreover, the influence of impairments of phase and amplitude within the IQ-branches of a receiver was investigated. The resulting, unwanted IQ-imbalance was shown to be a mixing method (multiplicative or additive) independent spurious effect. It is suggested to compensate for IQ-imbalance in the digital part of the receiver system. This can be realized with the use of adaptive algorithms. The comparison with conventional analog receiver architectures (especially homodyne receivers) with respect to the reception of today’s and future digitally modulated transmission signals indicate the proposed Six-Port-based receiver architectures to be suitable candidates to fulfill the difficult tasks of modern mobile communication.

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Schmogrow, Rene Marcel [Verfasser]. "Real-time Digital Signal Processing for Software-defined Optical Transmitters and Receivers / René Marcel Schmogrow." Karlsruhe : KIT Scientific Publishing, 2014. http://www.ksp.kit.edu.

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Brito, Filho Francisco de Assis. "VCO Banda Larga Integrado para Receptor a Cinco Portas." Universidade Federal do Rio Grande do Norte, 2009. http://repositorio.ufrn.br:8080/jspui/handle/123456789/15300.

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Made available in DSpace on 2014-12-17T14:55:40Z (GMT). No. of bitstreams: 1 FranciscoAB.pdf: 846082 bytes, checksum: d9718796dd9ac807f8f053e7d371d2bb (MD5) Previous issue date: 2009-09-03 Conselho Nacional de Desenvolvimento Cient?fico e Tecnol?gico This work presents an wideband ring VCO for cognitive radio five-port based receivers. A three-stage differential topology using transmission gate was adopted in order to maintain wide and linear tuning range and a low phase-noise. Monte-Carlo analysis were performed for phase-shift response of individual stages, which is an important figure of merit in five-port works. It was observed a fairly linear correlation between control voltage and oscillation frequency in the range between 200 MHz and 1800 MHz. The VCO was preliminarily designed for IBM 130nm CMOS technology Este trabalho apresenta um VCO anel banda-larga para ser utilizado em receptores para R?dio Cognitivo baseados no correlator a cinco portas. Uma arquitetura diferencial de tr?s est?gios com porta de transmiss?o ? utilizada como forma de manter uma sintonia linear em larga faixa de frequ?ncias, bem como, um baixo ru?do de fase. An?lises de Monte-Carlo foram feita para avaliar as varia??es de fase em cada est?gio, o que constitui uma figura de m?rito importante em receptores baseados no correlator de cinco portas. Observou-se correspond?ncia razoavelmente linear entre tens?o de controle e freq??ncia de oscila??o na faixa compreendida entre 200 MHz e 1800 MHz. O VCO foi preliminarmente projetado para tecnologia CMOS IBM de 130 nan?metros

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Mahmoud, Doaa. "Convertisseur analogique-numérique de type Sigma-Delta Passe-Bande avec résonateurs à un et deux amplificateurs." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS288.

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Le récepteur radio logicielle (SDR) est une technique prometteuse pour les futurs récepteurs adaptés à une variété de protocoles. Il numérise le signal RF directement en basse fréquence. Nous proposons un récepteur SDR basé sur un modulateur sigma-delta à temps continu passe-bande (CT BP ). Nous nous concentrons sur les résonateurs RC actifs pour diminuer la surface du circuit. Nous ciblons les applications au voisinage de 400 MHz, à savoir Advanced Research and Global Observation Satellite (ARGOS), Medical Implant Communication Service (MICS), Automobile Keyless system et Industrial, Scientific and Medical (ISM). Nous présentons une nouvelle comparaison détaillée entre le modulateur CT BP à résonateur à deux amplificateurs et le modulateur CT BP à résonateur à un amplificateur. Les deux modulateurs sont conçus à l'aide de transistors MOS en technologie FDSOI-28nm, où nous utilisons la polarisation du caisson pour compenser les variations de processus, de tension et de température Software defined radio receiver is a promising technique for future receivers which provides a variety of protocols. It digitizes the RF signal directly to low-frequency. We propose an SDR receiver based on a bandpass sigma delta modulator. The most essential element is the loop filter, there are two main configurations, an LC tank resonator and an active RC resonator. We focus on the active RC resonators for a low chip area. We target applications in the vicinity of 400 MHz, namely Advanced Research and Global Observation Satellite, Medical Implant Communication Service. We introduce a new comparison between the two-op-amp resonator CT BP sigma delta modulator and the one-op-amp resonator CT BP sigma delta modulator. We study the sensitivity of the quality factor and the signal to noise ratio to the DC-gain op-amps in two-op-amp resonator sigma delta modulator. It also shows how, in one-op-amp resonator sigma delta modulator, the quality factor and the signal to noise ratio, are very sensitive to any variations in the capacitors values for limited DC-gain op-amps. We establish a mathematical model of the thermal-noise behaviour for two-op-amp resonator CT BP sigma delta modulator. This model matches the circuit simulator results with a good accuracy. Furthermore, we demonstrate that a high quality factor (>100) of the two-op-amp resonators can be achieved by selecting the proper value of the integrator gain at a moderate DC-gain op-amp (35dB). Both sigma delta modulators are designed using flipped-well devices on fully depleted silicon on insulator technology, where we use body biasing to compensate the process, voltage and temperature variations

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Gerzaguet, Robin. "Méthodes de traitement numérique du signal pour l'annulation d'auto-interférences dans un terminal mobile." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GRENT014/document.

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Les émetteurs-récepteurs actuels tendent à devenir multi-standards c’est-àdireque plusieurs standards de communication peuvent cohabiter sur la même puce. Lespuces sont donc amenées à traiter des signaux de formes très différentes, et les composantsanalogiques subissent des contraintes de conception de plus en plus fortes associées au supportdes différentes normes. Les auto-interférences, c’est à dire les interférences généréespar le système lui-même, sont donc de plus en plus présentes, et de plus en plus problématiquesdans les architectures actuelles. Ces travaux s’inscrivent dans le paradigmede la « radio sale » qui consiste à accepter une pollution partielle du signal d’intérêtet à réaliser, par l’intermédiaire d’algorithmes, une atténuation de l’impact de ces pollutionsauto-générées. Dans ce manuscrit, on s’intéresse à différentes auto-interférences(phénomène de "spurs", de "Tx leakage", ...) dont on étudie les modèles numériques etpour lesquelles nous proposons des stratégies de compensation. Les algorithmes proposéssont des algorithmes de traitement du signal adaptatif qui peuvent être vus comme des« algorithmes de soustraction de bruit » basés sur des références plus ou moins précises.Nous dérivons analytiquement les performances transitionnelles et asymptotiques théoriquesdes algorithmes proposés. On se propose également d’ajouter à nos systèmes unesur-couche originale qui permet d’accélérer la convergence, tout en maintenant des performancesasymptotiques prédictibles et paramétrables. Nous validons enfin notre approchesur une puce dédiée aux communications cellulaires ainsi que sur une plateforme de radiologicielle Radio frequency transceivers are now massively multi-standards, which meansthat several communication standards can cohabit in the same environment. As a consequence,analog components have to face critical design constraints to match the differentstandards requirements and self-interferences that are directly introduced by the architectureitself are more and more present and detrimental. This work exploits the dirty RFparadigm : we accept the signal to be polluted by self-interferences and we develop digitalsignal processing algorithms to mitigate those aforementioned pollutions and improve signalquality. We study here different self-interferences and propose baseband models anddigital adaptive algorithms for which we derive closed form formulae of both transientand asymptotic performance. We also propose an original adaptive step-size overlay toimprove transient performance of our method. We finally validate our approach on a systemon chip dedicated to cellular communications and on a software defined radio

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Šrámek, Petr. "Implementace softwarového rádia do FPGA." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2009. http://www.nusl.cz/ntk/nusl-217786.

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The common objective of this project is implementation of software defined radio (SDR) into FPGA. The text contains review and comparison of several hardware concepts intended for SDRs implementation then the methods for digital implementation of various components of radios as the filters, mixers and others are mentioned. Part of the text introduces used hardware platform and describes software support for designing, simulations and implementation into hardware. Significant part of project describes complex of external hardware components as filter, amplifier and control panel designed and built within the project realization. But the main part of project demonstrates design of the software solution of radio receiver. There is specified architecture of radio for FM broadcast receiving, next the more complex systems with carrier recovery algorithm are presented. These systems are able to work with AM, BPSK and QPSK modulations. It is possible to implement all these receivers into hardware and verify their operation. The practical laboratory theme has been outlined within the project run.

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Boussebt, Amina. "Etude et mise en oeuvre de la technologie Li-Fi pour un lit de bébé connecté sans fil et sans radio." Electronic Thesis or Diss., Limoges, 2023. http://www.theses.fr/2023LIMO0091.

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Le domaine de la télésurveillance a connu un grand essor ces dernières décennies et concerne divers contextes par exemple en milieu hospitalier, en maison de retraite, chez les particuliers. La majorité des systèmes de télésurveillance existants aujourd’hui reposent sur la technologie des radiofréquences (RF). Nous proposons dans cette thèse, des travaux portant sur la télésurveillance dans un contexte nouveau qui concerne une crèche. Les RF présentant certains inconvénients, comme l’impact des interférences électromagnétiques, mais aussi des failles de sécurité, une solution alternative est la technologie de communication par optique sans fil. Ainsi, nous avons étudié l'utilisation de la technologie infrarouge pour la transmission simultanée de données issues de capteurs placés sur les pieds des lits de bébé mais aussi sur les bébés couchés dans leur lit au sein de la crèche. Le système de réception est constitué de photodiodes situées aux coins d'un panneau d'éclairage central au plafond de l'environnement. La simulation du canal réalisée grâce à la technique de lancer de rayons associés à la méthode de Monte-Carlo a permis de déterminer le gain du canal pour chaque dispositif. Plusieurs scénarios de déploiement ont été définis en considérant le caractère amovible ou fixe des dispositifs et l’interchangeabilité des lits dans la pièce. Le partage du canal utilise la technique d’accès multiple par répartition de codes (OCDMA) associée aux codes optiques orthogonaux (OOC) dont la principale limitation est l’interférence d’accès multiple (IAM). Les performances de la modulation binaire par position d’impulsion (2-PPM) avec OCDMA et un décodage souple en réception ont été établies théoriquement et par simulation pour les différents scénarios définis considérant un réseau de 11 utilisateurs constitué de 8 lits et 3 dispositifs portés par des bébés. Les résultats ont été obtenus avec des récepteurs conventionnels par corrélation sans et avec limiteur puis un récepteur à annulation parallèle d’interférence plus efficace pour réduire l’impact de l’IAM. De plus, la faisabilité de l’utilisation de la technique OCDMA pour la transmission simultanée en optique sans fil a été mise en évidence par des expérimentations menées grâce à un banc de test développé en radio logicielle. Le banc a été mis en place, en utilisant des USRP (Universal Software Radio Peripheral) et des front-ends optique sans fil développés spécifiquement The field of the remote monitoring has experienced significant advancements in recent decades, and now covers different contexts, such as hospitals, retirement homes, and private homes also. The majority of existing systems are based on radio frequency technology (RF).We propose in this thesis, research focused on remote monitoring in a new context involving a nursery. Given the limitations of RF technology, including the impact of electromagnetic interference, and security vulnerabilities, an alternative solution is optical wireless communication technology. Therefore, we investigated the use of infrared technology for simultaneous transmission of data collected from sensors placed on the foot of baby beds, and also on the babies themselves lying in their beds within the nursery. The reception system consists of photodiodes positioned at the corners of a central lighting panel on the celling. The channel simulation carried out using ray-tracing and Monte-Carlo methods was used to determine the channel gain for each device. Several deployment scenarios were defined, considering the nature of the devices (removable or fixed) and the interchangeability of beds in the room. The channel sharing employs the code division multiple access (OCDMA) associated with the optical orthogonal codes (OOC) with the primary constraint being the137 multiple access interference (MAI). The performance of binary pulse position modulation (2- PPM) with OCDMA and soft decoding in reception was studied theoretically and by simulation involving the different scenarios. These scenarios consider a network of 11 users, consisting of 8 beds and 3 devices carried by babies. Results were obtained using the conventional correlation receiver without and with hard limiters, as well as a parallel interference cancellation receiver to reduce the impact of MAI. Additionally, the feasibility of implementing OCDMA technology for simultaneous optical wireless communication transmission was demonstrated through experimental work using a test bench developed in software-defined radio. The test bench was established using universal software radio peripheral (USRP), and specially designed wireless optical front-ends

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Wang, Bo-Siang, and 王柏翔. "Structure and Simulation of Software-defined GPS Receiver." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/30891439539670470869.

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碩士 國立交通大學 機械工程系所 101 The improvement of communication technology made GPS (Global Positioning System) widely used in recent years. GPS products are often applied to navigation systems including aviations, marines, and automobiles. In general, commercial GPS are used in the environment that the altitude of the receiver is less than 18000m/s, speed and acceleration are less than 515m/s and 4g, respectively. Limited by above factors, commercial GPS can not be applied to high dynamic positioning. Compare to commercial GPS, the programmability of software GPS can change the algorithm structure through updating software. Therefore, the software GPS is selected as a platform in this research. In this thesis, we use MATLAB to simulate a non real-time algorithm of software GPS, which includes “acquisition,” “tracking,” decoding message data, and calculating user position. This algorithm is verified by the GPS data provided by National Space Organization (NSPO). Lastly, we propose a signal processing flow for the real-time software GPS.

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Sun, Chih-Cheng, and 孫志成. "Developing of GNSS Software Defined Receiver TestBed: Single Frequency Approach." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/16998094414324849507.

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碩士 國立成功大學 航空太空工程學系碩博士班 95 The modern standard GPS receivers, the hardware-based receivers, can provide accurate positioning and navigation services to users. However, the standard GPS receivers consist of hardware, the framework, and algorithm are difficult to modify for different environments. Recent advancement in digital signal processing and analog-to-digital conversion techniques has motivated the development of software defined receiver. In comparison with standard approaches, one advantage of the software defined receiver is the programmable algorithm. With the programmable algorithm, it is easy to change the parameters of the algorithm for all purposes. Therefore, the software defined receiver is more flexible than traditional approaches. This thesis will develop a GNSS Software Defined Receiver Test Bed on single frequency. This test bed consists of GNSS signal analysis, acquisition, tracking, and positioning processes. Users can change the parameters of these signal process algorithms for all purposes by the Graphical User Interface (GUI) of this test bed. In order to take advantages of software defined receiver, various GPS signal acquisition and tracking algorithms are included and evaluated by this test bed. Only the Galileo E1 band and GPS L1 band signals are broadcasted at the same center frequency (1575.42 MHz). The Galileo E1 band and GPS L1 band signals can be received by using the same antenna and front end. Consequently, this thesis will focus on the study of Galileo E1 band and GPS L1 band signals. In this thesis, the acquisition of Galileo GIOVE-A E1 band signal will be introduced and implemented by this testbed. This thesis will focus on the tracking GPS signals of different strength received by a GPS receiver under different environments. The parameters of tracking loop are compensated according to different strength signals. This thesis uses NordNav R30 software receiver and SiGe front end to collect the GPS signals under different environments and store the real intermediate frequency data for after processes. According to the different signal strengths, reach the purposes of signal tracking by changing the tracking algorithm and parameters. Finally, we use these different tracking loop algorithms to position and to evaluate their positioning results. By this test bed, it is possible to obtain the suitable signal processing algorithm under the different receiving strength by a GPS receiver under different environments.

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Fu, Wei-Jhong, and 傅威中. "Timing Simulation on Multi-mode demodulator for Software Defined Radio Receiver." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/g5eb3p.

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碩士 國立東華大學 電機工程學系 96 The objective is to establish mobile communication standard with the function of global roaming across any systems and networks. However, the transmission schemes such as coding/decoding, modulation/ demodulation and signal bandwidth among mobile systems are different. Software defined radio technique migrates the traditional hardware radio platform to more flexible software radio platform that can support multiple air interface standards. Due to the fact that different wireless communication systems were developed in the recent years, different communication techniques must be adapted onto them. In the future, the trend of the communication is to integrate different communication systems in a handset. How to integrate different transceivers in a handset is an important issue. In this paper, we propose a multimode-demodulation scheme to integrate three modulation schemes including M-ary quadrature amplitude modulation (M-QAM) and Gaussian minimum shift keying (GMSK). We adopt the pulse shaping filter and Gaussian filter to implement this scheme. By adjusting the parameters of the filters, the proposed scheme can switch among different modulation schemes. The simulation results show that the proposed scheme can achieve the desired multimode-demodulation receivers. We use Altera QuartusⅡsoftwave for Logic Synthesis, Place & Route, and Timing Simulation.

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Cheng, Jui-ch'un, and 鄭睿群. "Implement of Software-defined GPS Receiver on a DSP-FPGA Platform." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/82533403560769169987.

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碩士 國立交通大學 機械工程系所 102 In Global Positioning Systems, we need to receive the signal transited by satellite for positioning. Because of the relative motion between satellite and receiver and transit time, it will cause the frequency shift and time-delay of the signal. We must lock the frequency and time-delay of the signal precisely for acquiring the information for positioning. So we need to reach the goal by using acquisition loop and tracking loop. In order to compile on the single board, we analyze the traditional signal acquisition first, and develop a method which can decrease the computation under the traditional framework; Therefore the method can not only save lots of time but utilize the software more efficiently. Because of the limit bandwidth of the loop, we have to lower the frequency offset error before we send the signal in to the signal tracking loop, and we use the feature of the correlation to gain the frequency we want. In the paper, we use Labview to compile the algorithm of GPS signal acquisition and signal tracking, compiling the analyzed system structure in to different single board location, in order to maximize the effectiveness of the resources. Finally, using the signal recorded by antenna to verify the effectiveness and availability of algorithm, and then comparing the traditional method results with the new one.

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Chen-HsunHo and 何承勳. "Spectrum Monitoring with Unmanned Aerial Vehicle Carrying Software Defined Radio Receiver." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/45179774400621446689.

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碩士 國立成功大學 電信管理研究所 104 Mobile spectrum monitoring is increasingly important in today’s era of advanced communications technology, although this is limited by geographical restrictions and high cost. Therefore, this study combines software-defined radio and an unmanned aerial vehicle to build a system to address these weaknesses, using an FM radio station as the target. This study uses software-defined radio and an antenna on an unmanned aerial vehicle, and a ground station operate and monitor an air station via Wi-Fi technology. This system can monitor spectrum occupancy and signal strength, and also carry out signal analysis. Since the signal strength becomes weaker as the distance increases, the unmanned aerial vehicle can circle around with a fixed radius and the directional antenna can observe the changes in signal strength, and thus find the orientation of the station.

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Huang, Li-Yang, and 黃立揚. "Smart Badge Access Point Receiver ImplementationBased on Software Defined Radio Module." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/8w9na2.

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碩士 國立臺灣大學 電子工程學研究所 106 In this paper we proposed a short-distance communication Smart Badge System which communicates through wireless channel and integrates the transceivers into licensed-free 416MHz bands. Modulation format of Smart Badge is DQPSL due to simplicity. The system design of Smart Badge is focusing on low complexity and dealing with some non-linear effect. The system is multiple users transmission system, every packet may have different Carrier frequency offset and clock offset, so each time we receive packet, we need to synchronize again. Besides our system adopts random access mode protocol that its packet arrival time is unknown, so packet synchronization is necessary. We design and implement a low complexity Smart Badge base station receiver based on software defined radio module. We choose bladeRF SDR module, because it is suitable for our system specification. Due to its zero-IF architecture, we need to deal with some non-linear effect by DSP functions. Such as IQ imbalanced compensation, AGC, DC offset compensation and packet detection and confirm. The parameter we choose is simulation by assume SNR=10-15dB. We use Matlab to implement DSP function. The PER is about 13.46%,

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Lai, Ming-Hsuan, and 賴明煊. "Design and Implementation of V2X Receiver on a Software Defined Radio Platform." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/bx3k79.

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碩士 國立臺灣大學 電子工程學研究所 107 Vehicle-to-everything (V2X) refers to the wireless exchange of digital information between vehicles and other nodes, such as other vehicles, road infrastructure, internet, and pedestrians. V2X is expected to enable autonomous driving that provides safer and much more energy-efficient transportation services. Massive machine type communications (mMTC) and ultra-reliable and low latency communications (URLLC) which are two main scenarios in 5G communication, and their potential commercial potential has prompted research works on the 5G V2X tehcnology. 5G communications technology and applications are flexible and diverse, making it a huge challenge to implement the 5G system efficiently. Among several solutions, software-defined radio (SDR) has become an attractive approach. In this thesis, we integrates and builds a software-defined radio platform using a GPU with a large amount of parallel computing resources, a well-developed commercial RF module, and an open source graphical user interface toolkit. In addition, various highly efficient algorithms and system optimization techniques on GPU implementation are also proposed. Such as high-throughput linear feedback shift register implementation by transforming the recursive algorithm into a block matrix form. Further, we also successfully verify our platform and demonstrate the system specified by 3GPP in field trial. It is shown that our platform can finish decoding in 5 ms and maintain BLER under 0.0001 at the same time. The development of 5G specifications, NR C-V2X is just around the corner. We believe the proposed flexible OpenCL-based software-defined-radio system can serve as a foundation for the quick development of NR C-V2X prototype with minor modification. Also, the related algorithms and optimization techniques proposed in this paper are not only applicable in 5G, but also get more significant gain due to higher bandwidth and modulation order.

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