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Dissertations / Theses on the topic 'Radio Interference'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Finlay, Chris. "Radio Frequency Interference: Simulations for Radio Interferometry Arrays." Master's thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33716.

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Radio Frequency Interference (RFI) is a massive problem for radio observatories around the world. Due to the growth of telecommunications and air travel RFI is increasing exactly when the world's radio telescopes are increasing significantly in sensitivity, making RFI one of the most pressing problems for astronomy in the era of the Square Kilometre Array (SKA). Traditionally RFI is dealt with through simple algorithms that remove unexpected rapid changes but the recent explosion of machine learning and artificial intelligence (AI) provides an exciting opportunity for pushing the state-of-the-

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2

Wang, Xufang. "Interference cancellation in impulse radio." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31459365.

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3

Wang, Xufang, and 王徐芳. "Interference cancellation in impulse radio." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31459365.

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4

Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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5

Mitchell, Daniel Allan. "Interference Mitigation in Radio Astronomy." University of Sydney. Physics, 2004. http://hdl.handle.net/2123/693.

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This thesis investigates techniques and algorithms for mitigating radio frequency interference (RFI) affecting radio astronomy observations. In the past radio astronomy has generally been performed in radio-quiet geographical locations and unused parts of the radio spectrum, including small protected frequency bands. The increasing use of the entire spectrum and global transmitters such as satellites are forcing the astronomy community to begin implementing active interference cancelling. The amount of harmful interference affecting observations will also increase as future instruments such as

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6

Hamdi, Karama. "Interference avoidance in cognitive radio networks /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20HAMDI.

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7

Sihlangu, Isaac. "The MeerKAT Radio Frequency Interference Environment." Master's thesis, Faculty of Science, 2019. https://hdl.handle.net/11427/31748.

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Radio signals from astronomical sources are extremely weak and easily distorted/- corrupted or overwhelmed by man-made radio signals such as cellphones, satellites, aircraft and telescope electronics. These Radio Frequency Interference (RFI) are increasingly threatening radio observatories due to our increasingly technological world. To detect and mitigate RFI, observatories need to understand their RFI environment, what contributes to it and how it is changing. While there are few dedicated RFI monitoring systems on the MeerKAT site, the most sensitive RFI detector is the MeerKAT array itself

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8

Ellingsæter, Brage Høyland. "Cognitive Radio: Interference Management and Resource Allocation." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11295.

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In this thesis the performance of different cognitive systems are analyzed in different environments and scenarios. The main scenarios are: one cognitive and one primary user, multiple cognitive users and channels and multiple cognitive and primary users. With primary users in the vicinity, cognitive systems are evaluated both when no degradation to primary user QoS is allowed and when some degradation is allowed, measured by an outage probability. In all scenarios involving one or more primary users, the performance is evaluated over two phases. In Phase 1 the channel is idle, i.e. the primar

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9

Romalo, David N. "An interference monitor for a radio observatory." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28514.

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This thesis describes the design, construction, and testing of a radio-frequency interference monitoring system for use with the synthesis array telescope at the Dominion Radio Astrophysical Observatory near Penticton, B.C. The system is designed to provide continuous, automated surveillance of the radiospectrum around 408 MHz. Interfering signals are characterized and catalogued according to strength, duration, frequency, and direction. Although the monitor is presently a very useful tool for detecting and finding sources of interference, it is ultimately intended to communicate directly with

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10

Ho, Philip Shiu Wai. "Structural intermodulation interference in mobile radio systems." Thesis, City University London, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305174.

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11

Zhou, Jun. "Antenna aided interference mitigation for cognitive radio." Thesis, University of Edinburgh, 2009. http://hdl.handle.net/1842/10676.

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12

Harrison, Kyle. "Machine Learning for Radio Frequency Interference Flagging." Master's thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/33777.

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The field of radio frequency interference (RFI) flagging involves the identification of corrupted data within radio astronomy measurements. This work explores the application of supervised machine learning algorithms for RFI flagging, trained on real measurement data and simulated data with simulated RFI. The goal of this work is to investigate the prediction of RFI using specific machine learning algorithms; Naive Bayes Classifier, K-Nearest Neighbours Classifier, Random Forest Classifier, the U-Net convolution neural network and the Multilayer Perceptron. These algorithms are trained on real

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13

Ring, Christoffer. "Detection and Classification of Interference in Mobile Communication Systems." Thesis, Linköpings universitet, Kommunikationssystem, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-123507.

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The usage of wireless technology has in the past decade vastly increased and it continues to do so as well. Because of this, we become more and more reliant on this considerably fragile technology. Wireless technology, which uses radio waves to transmit data from one point to another can easily be interfered by radio jammers. This thesis work is about the detection and classification of the interference that is produced by jammers over the Global System for Mobile Communications (GSM) air interface. A typical GSM jammer that can be found on the Internet is analyzed but also more advanced GSM j

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14

Håland, Pål. "Queue Management and Interference control for Cognitive 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-9046.

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<p>In this report I will look at the possibility of using a sensor network to control the interference to primary users made by secondary users. I'm going to use two Rayleigh fading channels, one to simulate the channel between the secondary transmitter and the sensor, and another to simulate the channel between the secondary transmitter and secondary receiver. I assume that the system is either using multiple antennas or that the secondary transmitter is moving relative to the sensor and primary user so that the channels share the same statistics. If the interference level gets too high at th

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15

Yaobin, Wen. "Asymptotic Analysis of Interference in Cognitive Radio Networks." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23997.

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The aggregate interference distribution in cognitive radio networks is studied in a rigorous and analytical way using the popular Poisson point process model. While a number of results are available for this model for non-cognitive radio networks, cognitive radio networks present extra levels of difficulties for the analysis, mainly due to the exclusion region around the primary receiver, which are typically addressed via various ad-hoc approximations (e.g., based on the interference cumulants) or via the large-deviation analysis. Unlike the previous studies, we do not use here ad-hoc approxim

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16

Hu, Y. F. "Intermodulation interference probabilities in cellular mobile radio systems." Thesis, University of Bradford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380394.

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17

Faragher, Ramsey Michael. "Effects of multipath interference on radio positioning systems." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612008.

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18

Chen, Zengmao. "Interference modelling and management for cognitive radio networks." Thesis, Heriot-Watt University, 2011. http://hdl.handle.net/10399/2421.

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Radio spectrum is becoming increasingly scarce as more and more devices go wireless. Meanwhile, studies indicate that the assigned spectrum is not fully utilised. Cognitive radio (CR) technology is envisioned to be a promising solution to address the imbalance between spectrum scarcity and spectrum underutilisation. It improves the spectrum utilisation by reusing the unused or underutilised spectrum owned by incumbent systems (primary systems). With the introduction of CR networks, two types of interference originating from CR networks are introduced. They are the interference from CR to prima

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19

闐, 田. "Signal detection and interference avoidance in cognitive radio." Thesis, https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12614652/?lang=0, 2013. https://doors.doshisha.ac.jp/opac/opac_link/bibid/BB12614652/?lang=0.

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20

Murawski, Robert. "Practical Interference Avoidance Protocols for Cognitive Radio Networks." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1314632531.

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21

Bilkhu, T. S. "Radio frequency interference from small a.c. commutator motors." Thesis, Aston University, 1985. http://publications.aston.ac.uk/15093/.

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22

Lambert, Michael J. "Radio Frequency Interference Cancellation,Appraisal, Detection, and Correction." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7394.

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Radio Astronomy, the study of distant objects in the radio spectrum, is set at defiance against all other users of the electromagnetic spectrum. Where traditional use would fill the electromagnetic spectrum with as much transmission and information as possible, Radio Astronomy would rather no man-made signals existed. Since that is not possible, they grumble and have to deal with unwanted transmissions impinging upon their instruments. I have demonstrated that subspace projection can remove these unwanted signals from Radio Astronomical data in post processing. I demonstrate it both on simulat

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23

Janes, Clinton C. "The Impact of Telemetry on Radio Astronomy." International Foundation for Telemetering, 1995. http://hdl.handle.net/10150/608408.

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International Telemetering Conference Proceedings / October 30-November 02, 1995 / Riviera Hotel, Las Vegas, Nevada<br>The National Radio Astronomy Observatory (NRAO) operates the Very Large Array (VLA) Radio Observatory in New Mexico, and the Very Long Baseline Array (VLBA) with 10 radio antenna in locations from Hawaii to St. Croix, as well as other radio telescopes at Green Bank, West Virginia, and the 12 meter radio antenna near Tucson, AZ. Although radio frequency (RF) bands have been set aside for passive use by these radio telescopes, harmful interference from increased demands on

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24

Li, Tao. "Signal detection in unknown interference channels /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20LI.

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25

Arnott, Robert. "Array processing for digital mobile radio." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.338780.

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26

Whyman, Neil L. "Modelling RF interference effects in integrated circuits." Thesis, University of York, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273884.

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27

Almalfouh, Sami M. "Interference-aware resource management techniques for cognitive radio networks." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43736.

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The objective of the proposed research is to develop interference-aware resource management techniques for CR networks that opportunistically operate within the licensed primary networks spectrum and to investigate the application of such CR techniques to emerging wireless networks. In this thesis, we report on a set of laboratory experiments that we undertook to analyze the interference between the CR-based wireless regional-area network (WRAN) standard and the digital television (DTV) broadcasting system. We determined the tolerable levels of WRAN interference into DTV receivers and studied

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28

Bayo, Moya Alberto. "Distributed interference and data buffer management for cognitive radio." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11091.

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Future wireless communications are focused on develop new paradigms of spectrum reuse, i.e. cognitive radio, where radio frequencies can be taken into used if no other use is detected. In this way, these systems need mechanisms for interference control. In this work we study the use of a distributed system based on cognitive radio. Scheduling transmitters and data rate optimization algorithms have been implemented in order to balance the secondary user transmissions and maximize the data rate transmission. Radio sensors are used to monitor the interference levels generated by the different tra

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29

Vihlborg, Fredrik. "On Models for Interference Calculations between Radio Communication Systems." Thesis, KTH, Signalbehandling, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-52591.

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When installing a new radio system, it is of great importance to know that it will not interfere with the already existing systems, and that they can coexist side by side. The problems that will follow if interference occurs, can be of huge magnitude, e.g. radars not working, trains stopping etc. The idea of this thesis is to find an analysing method that can take several parameters into account when evaluating the scenario and its possible conflicts, and since many of the radio systems today are digital, give the bit error rate as a result. The problem is to find a way to model both the victi

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30

Doyle, A. J. "Devices for radio frequency interference limitation in electrical circuits." Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298270.

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31

Tran, Hung. "Performance Analysis of Cognitive Radio Networks with Interference Constraints." Doctoral thesis, Blekinge Tekniska Högskola, Sektionen för datavetenskap och kommunikation, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-00550.

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To support the rapidly increasing number of mobile users and mobile multimedia services, and the related demands for bandwidth, wireless communication technology is facing a potentially scarcity of radio spectrum resources. However, spectrum measurement campaigns have shown that the shortage of radio spectrum is due to inefficient usage and inflexible spectrum allocation policies. Thus, to be able to meet the requirements of bandwidth and spectrum utilization, spectrum underlay access, one of the techniques in cognitive radio networks (CRNs), has been proposed as a frontier solution to deal wi

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32

Howlader, Mohammad Mostofa Kamal. "Selective Interference Cancellation and Frame Synchronization for Packet Radio." Diss., Virginia Tech, 2000. http://hdl.handle.net/10919/28461.

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This research investigates the application of multiuser interference suppression to direct-sequence code-division multiple-access (DS-CDMA) for peer-to-peer packet radio networks. The emphasis of this work is to develop and validate efficient interference suppression techniques through selective cancellation of interference; next, the combination of interference suppression with error correction coding is studied. A decoder-assisted frame synchronization technique is proposed for future packet radio system. The performance of DS-CDMA in packet radio networks suffers from the near-far problem.

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33

Stemmons, Alan J. "Radio frequency interference mitigation on the very small array /." Diss., CLICK HERE for online access, 2009. http://contentdm.lib.byu.edu/ETD/image/etd3025.pdf.

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34

Stemmons, Alan Joseph. "Radio Frequency Interference Mitigation on the Very Small Array." BYU ScholarsArchive, 2009. https://scholarsarchive.byu.edu/etd/1856.

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Radio astronomical synthesis imaging arrays can create images with resolution much higher than can single dish telescopes. However, one of the biggest problems that imaging arrays face is radio frequency interference (RFI). This interference corrupts signals and prevents accurate image creation. Therefore, it is necessary to remove this interference. This thesis discusses the synthesis imaging procedure and array spatial filtering methods to remove interference, including Multiple Sidelobe Canceller (MSC), Subspace Projection (SP), and Cross-Subspace Projection (CSP). The CLEAN algorithm, an

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35

Pateromichelakis, Emmanouil. "Inter-cell interference-aware radio resource management for femtocell networks." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.600130.

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The widespread data demand in emerging wireless cellular technologies necessitates the evolution of traditional networks' deployment to accommodate the ever increasing coverage and capacity requirements. In emerging wireless systems a hierarchical multi-level network that consists of a mixture of outdoor small cells (relays) and indoor small cells (femtocell) deployments underneath the traditional macro-cell architecture can be seen as a key deployment strategy to meet these growing capacity demands. In such networks, Femtocell technology has attracted much attention as a key "player" to addre

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36

Lee, Kyehun. "Coherent Mitigation of Radio Frequency Interference in 10-100 MHz." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28929.

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This dissertation describes methods of mitigating radio frequency interference(RFI) in the frequency range 10-100 MHz, developing and evaluating coherent methods with which RFI is subtracted from the afflicted data, nominally resulting in no distortion of the underlying signals. This approach is of interest in weak signal applications such as radio astronomy, where the signal of interest may have interference-to-noise ratio much less than one, and so can be easily distorted by other methods. Environmental noise in this band is strong and non-white, so a realistic noise model is developed, with

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37

Descalzi, Doug. "System design of a satellite radio frequency interference analysis system." Master's thesis, Virginia Tech, 1996. http://hdl.handle.net/10919/41244.

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see document<br>The conceptual and preliminary design of the Dynamic Link Tool (DLTool) System are presented. The DLTool System performs moderate fidelity, satellite radio frequency (RF) interference and communications analysis. The primary customer of the DLTool System is Program 607 of Lockheed Martin Corporation (LMC) in Valley Forge, Pennsylvania. The system will dramatically improve the existing satellite RF interference analysis capabilities of Program 607, which are currently inadequate. Most-importantly, the DLTool System will reduce the required analysis time for satellite RF in

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38

Guner, Baris. "Studies of Radio Frequency Interference Detection Methods in Microwave Radiometry." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1238780286.

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39

Descalzi, Douglas Hall. "System design of a satellite radio frequency interference analysis system /." This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-02232010-020027/.

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40

Poulsen, Andrew Joseph. "Real-time Adaptive Cancellation of Satellite Interference in Radio Astronomy." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd238.pdf.

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41

Buchan, James. "Mitigating Electromagnetic Interference in Power Converters for Radio Astronomy Applications." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/88250.

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Computational studies and a prototype half-bridge DC-DC converter capable of logistic-shaped switching transitions to achieve high-frequency electromagnetic interference mitigation is presented. The logistic-shaped transition provides steep spectral content roll-off, which is desirable for low noise outcomes. The research demonstrates that shaped switching transitions can be integrated into power converters operating with pulse with modulation control strategies, which is desirable for low noise applications such as radio astronomy.

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42

Forte, Véliz Giuseppe Francesco. "Contributions to radio frequency interference detection and mitigation in Earth observation." Doctoral thesis, Universitat Politècnica de Catalunya, 2014. http://hdl.handle.net/10803/285320.

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Radio Frequency Interference (RFI) is the most common problem for electronic measuring systems. The presence of those electromagnetic waves can harm the measurements taken from very sensitive instruments, like microwave radiometry or navigation systems. The accuracy and precision are compromised. A first step to mitigate those unwanted effects is to study the RFI properties. Different algorithms have been proposed to detect the interferences, but there is no method that works in all cases. The scope of this dissertation is the design, implementation and testing of different detection and mi

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43

Gong, Xitao [Verfasser]. "Spectrum sensing and interference mitigation in cognitive radio networks / Xitao Gong." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2014. http://d-nb.info/1052160514/34.

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44

Llorca, Beltrán Jose María. "Performance of Joint Interference and Data Buffer Management for Cognitive Radio." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-11090.

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Cognitive Radio is a technology where Software Defined Radio functionality is augmented in order to permit a radio system where its operations will be adjusted depending on the environment. This capability offers a variety of benefits, first of all to solve the problem of spectrum scarcity.This Master's thesis proposes a solution based on sensing interference and data queue back-pressure. For this purpose, a Matlab simulator has been done to simulate some scenarios and prove the theory in a practical way. The thesis has shown how sensors can be used to listen to the mutual interference between

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45

Hassan, Mai Mohamed. "Cooperative beamforming for cognitive radio systems in presence of asynchronous interference." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/54350.

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Cognitive radio (CR) is considered a key enabling technology to exploit the underutilized and non-utilized radio spectrum bands. On the other hand, cooperative communication among nodes in CR networks, can improve the overall performance of CR systems, in terms of increasing data rates, attainable coverage range and overall energy efficiency, providing some diversity against shadow fading, and having low deployment costs. In a CR network, cooperative transmit beamforming can be achieved via a number of single antenna-based CR nodes organizing themselves in a virtual antenna array and focusing

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46

Aksoy, Mustafa. "Radio Frequency Interference Characterization and Detection in L-band Microwave Radiometry." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448989873.

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47

Mesarcik, Michael. "Discrete Wavelet Methods for Interference Mitigation: An Application To Radio Astronomy." Master's thesis, Faculty of Engineering and the Built Environment, 2019. http://hdl.handle.net/11427/30898.

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The field of wavelets concerns the analysis and alteration of signals at various resolutions. This is achieved through the use of analysis functions which are referred to as wavelets. A wavelet is a signal defined for some brief period of time that contains oscillatory characteristics. Generally, wavelets are intentionally designed to posses particular qualities relevant to a particular signal processing application. This research project makes use of wavelets to mitigate interference, and documents how wavelets are effective in the suppression of Radio Frequency Interference (RFI) in the cont

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48

Schiller, Jonathan D. (Jonathan David). "Radio frequency interference and risk of damage for satellite servicing missions." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122416.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Aeronautics and Astronautics, 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 109-110).<br>This thesis assesses the potential for radiation transmitted from a servicing satellite in geostationary orbit to couple into the receivers on its intended client, thereby causing interference or even damage to receiver components. It begins by examining the satellite servicing paradigm, and introducing as case studies two missions that are currently in development. Then the theory of coupling i

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Dalla, Chiara Andrea. "Analysis of performance and interference effects in Radio Frequency IDentification systems." Doctoral thesis, Università degli studi di Padova, 2011. http://hdl.handle.net/11577/3422001.

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During the last years, the definition of “communication” has been rewritten by the viral diffusion of a class of devices which has been thought and created to open new and fast channels of interaction. The contraction they create on the space of communications is linked to a virtually instantaneous availability, so we all have access to anything, and in any place. Today, in this way, unimaginable amounts of information are transferred through wireless systems. With an image, we could say that the concept of voice has been amplified or even recreated: who could speak, now may go further, withou

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50

Chami, Marwa. "Optimization in cognitive radio systems with successive interference cancellation and relaying." Thesis, Paris, CNAM, 2016. http://www.theses.fr/2016CNAM1050.

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La Radio Cognitive (CR) est une technique prometteuse pour assurer une utilisation efficace du spectre. Elle permet à un utilisateur non licencié appelé utilisateur secondaire (SU) de coexister avec un utilisateur agréé appelé utilisateur primaire (PU) sans dégrader les performances du dernier. Dans un système de CR, le SU a la capacité de s'adapter à son environnement afin de détecter des trous de fréquences possibles dans le spectre et transmettre dans ces trous sous certaines contraintes de manière à augmenter le débit total. Par ailleurs, l'allocation des ressources dans les systèmes CR fo

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