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Дисертації з теми "Coded waveform"

Автор: Grafiati

Опубліковано: 14 вересня 2024

Оновлено: 31 липня 2025

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1

Saleh, Mahdi. "Contributions to High Range Resolution Radar Waveforms : Design of Complete Processing Chains of Various Intra-Pulse Modulated Stepped-Frequency Waveforms." Thesis, Bordeaux, 2020. http://www.theses.fr/2020BORD0024.

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Анотація:

Dans divers systèmes radar, un grand intérêt a été porté à la sélection d’une forme d’onde et à la conception d’une chaîne de traitement complète, de l’émetteur au récepteur, afin d’obtenir un profil distance haute résolution (HRRP, acronyme de High Range Resolution Profile en anglais). Au cours des dernières décennies, les concepteurs d’algorithmes de traitement du signal radar ont concentré leur attention sur différentes formes d’onde telles que les techniques de compression d’impulsion et les systèmes à bande synthétique (SF acronyme de stepped frequency, en anglais).D’une part, trois types

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2

Bourduge, Jocelyn. "Shémas de codage binaires et non-binaires pour l'Internet des Objets." Electronic Thesis or Diss., Université de Toulouse (2023-....), 2024. http://www.theses.fr/2024TLSEP059.

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Анотація:

L'Internet des Objets (IoT), permettant l'interconnectivité de dispositifs physiques capables de collecter et d'échanger des données, connait depuis quelques années un immense intérêt. Son cercle d'influence touche de nombreux domaines très diverses comme par exemple la santé, l'agriculture, l'industrie ou bien encore les villes connectées.Cependant, le déploiement à grande échelle des équipements IoT peut présenter des difficultés, notamment pour des applications nécessitant des communications longue portée avec une faible consommation énergétique, tout en assurant des transmissions sans erre

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3

Friedrich, Konrad Jens. "Development of an active SONAR platform for AUV applications in a closed environment." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/20026.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: In recent years Autonomous Underwater Vehicles (AUVs) have become interesting for harbor mapping and protection. AUVs require a SONAR sensor for observing their surroundings, thus enabling them to perform collision avoidance manoeuvres and scanning their operating environment for intruders or foreign objects, e.g. mines. To perform such actions the SONAR sensor is required to supply very fine range resolution for target imaging, as well as providing information about possible target velocity. Basic SONAR theory is discussed

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4

Bilgi, Akdemir Safak. "An Overview Of Detection In Mimo Radar." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612589/index.pdf.

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In this thesis study, an overview of MIMO radar is presented. The differences in radar cross section, channel and received signal models in different MIMO radar configurations are examined. The performance improvements that can be achieved by the use of waveform diversity in coherent MIMO radar and by the use of angular diversity in statistical MIMO radar are investigated. The optimal detector under Neyman-Pearson criterion for Coherent MIMO radar when the interfering signal is white Gaussian noise is developed. Detection performance of phased array radar, coherent MIMO radar and Statistical M

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5

Choy, Eddie L. T. "Waveform interpolation speech coder at 4 kbs." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=20901.

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Speech coding at bit rates near 4 kbps is expected to be widely deployed in applications such as visual telephony, mobile and personal communications. This research focuses on developing a speech coder based on the waveform interpolation (WI) scheme, with an attempt to deliver near toll-quality speech at rates around 4 kbps. A WI coder has been simulated in floating-point using the C programming language. The high performance of the WI model has been confirmed by subjective listening tests in which the unquantized coder outperforms the 32 kbps G.726 standard (ADPCM) 98% of the time under clean

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6

Choy, Eddie L. T. "Waveform interpolation speech coder at 4 kb/s." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0028/MQ50596.pdf.

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7

Aivaliotis, Theodoros. "Performance analysis of a JTIDS/link-16-type waveform using 32-ary orthogonal signaling with 32 chip baseband waveforms and a concatenated code." Thesis, Monterey, California: Naval Postgraduate School, 2009. http://hdl.handle.net/10945/4472.

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Approved for public release, distribution unlimited<br>The Joint Tactical Information Distribution System (JTIDS)) is a hybrid frequency-hopped, direct sequence spread spectrum system which used cyclic code-shift keying (CCFK) for M-ary symbol modulation and minimum shift-keying (MSK) for chip modulation. In addition JTIDS uses a (31, 15) Reed Solomon (RS) code for channel coding. In this thesis an alternative waveform consistent with the original JTIDS waveform is analyzed. The system to be considered uses a concatenated code consisting of a (31, k) Reed Solomon inner code and a 4/5 convol

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8

Khan, Mohammad M. A. "Coding of excitation signals in a waveform interpolation speech coder." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=32961.

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The goal of this thesis is to improve the quality of the Waveform Interpolation (WI) coded speech at 4.25 kbps. The quality improvement is focused on the efficient coding scheme of voiced speech segments, while keeping the basic coding format intact. In the WI paradigm voiced speech is modelled as a concatenation of the Slowly Evolving pitch-cycle Waveforms (SEW). Vector quantization is the optimal approach to encode the SEW magnitude at low bit rates, but its complexity imposes a formidable barrier.<br>Product code vector quantizers (PC-VQ) are a family of structured VQs that circumvent the c

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9

Koromilas, Ioannis. "Performance analysis of the link-16/JTIDS waveform with concatenated coding." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FKoromilas.pdf.

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Анотація:

Thesis (M.S. in Electronic Warfare Systems Engineering)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Robertson, Ralph C. "September 2009." Description based on title screen as viewed on 5 November 2009. Author(s) subject terms: Link-16/JTIDS, Reed-Solomon (RS) coding, Cyclic Code-Shift Keying (CCSK), Minimum-Shift Keying (MSK), convolutional codes, concatenated codes, perfect side information (PSI), Pulsed-Noise Interference (PNI), Additive White Gaussian Noise (AWGN), coherent detection, noncoherent detection. Includes bibliographical references (p. 79). Also available in

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10

Gunawardana, Upul, and Kurt Kosbar. "OPTIMIZATION OF REFERENCE WAVEFORM FILTERS IN COHERENT DELAY LOCKED LOOPS." International Foundation for Telemetering, 1999. http://hdl.handle.net/10150/606804.

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International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada<br>In this paper, a new coherent correlation-loop architecture for tracking direct-sequence spread-spectrum signals is proposed. In the proposed correlation loop model, the mean-square tracking error is minimized by varying the cross-correlation function between the received signal and the locally generated signal. The locally generated signal is produced by passing a replica of the transmitted signal through a linear time-invariant filter, which is termed the V

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11

Kagioglidis, Ioannis. "Performance analysis of a LINK-16/JTIDS compatible waveform with noncoherent detection, diversity and side information." Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Sep/09Sep%5FKagioglidis%5FECE.pdf.

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Анотація:

Thesis (M.S. in Electrical Engineering)--Naval Postgraduate School, September 2009.<br>Thesis Advisor(s): Robertson, R. Clark. "September 2009." Description based on title screen as viewed on 6 November 2009. Author(s) subject terms: Link-16/JTIDS, (31, 15) Reed-Solomon (RS) coding, 32-ary Orthogonal signaling, Additive White Gaussian Noise (AWGN), Pulse-Noise Interference (PNI), Perfect Side Information (PSI). Includes bibliographical references (p. 49-51). Also available in print.

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12

Chindapol, Aik. "An implementation of TD/CCSK waveform using optical signal processing." Ohio : Ohio University, 1996. http://www.ohiolink.edu/etd/view.cgi?ohiou1178655869.

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13

Hällgren, Karl-Johan. "Waveform agility for robust radar detection and jamming mitigation." Thesis, Uppsala universitet, Fasta tillståndets elektronik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-453241.

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In this report metrics for jamming resistance and radar performance of waveform sets are described and developed, and different sets of waveforms are optimized, evaluated and compared. It is shown that without additional processing or PRI jitter, waveform sets can reach jamming resistance a few dB worse than what is provided by PRI jitter alone, and together with PRI jitter a few dB better. Waveforms with better jamming resistance tend to have worse range sidelobes and Doppler tolerance, but show less structure in their spectrograms, suggesting better LPI properties. The Doppler tolerance metr

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14

Halsema, John Anthony. "A high resolution wide-band sonar using coded noise-like waveforms and a parametric transmit array." Thesis, Massachusetts Institute of Technology, 1992. http://hdl.handle.net/1721.1/13133.

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15

Potter, Chris, Kurt Kosbar, and Adam Panagos. "Effects of Synchronization Error on Space Time Block Codes Equipped with FSK Waveforms." International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/605966.

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ITC/USA 2009 Conference Proceedings / The Forty-Fifth Annual International Telemetering Conference and Technical Exhibition / October 26-29, 2009 / Riviera Hotel & Convention Center, Las Vegas, Nevada<br>Space-time Coding (STC) for Multiple-Input Multiple-Output (MIMO) wireless communication systems is an effective technique for providing robust wireless link performance in telemetry systems. This paper investigates the degradation in system performance when synchronization errors between the transmitter and receiver are present. Specifically, expressions that quantify the increase in symbol-e

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16

Oza, Maulik D. "Performance Analysis of Turbo Coded Waveforms and Link Budget Analysis (LBA) based Range Estimation over Terrain Blockage." University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1278524750.

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17

Bliūdžius, Mindaugas. "Skaitmeninių kalbos įrašų glaudinimo metodai." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2004. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2004~D_20040529_122424-17577.

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Анотація:

The past three decades has witnessed substantial progress towards the application of low-rate speech coders to civilian and military communications as well as computer-related voice applications. Central to this progress has been the development of new speech coders capable of producing high-quality speech at low data rates. Most of these coders incorporate mechanisms to: represent the spectral properties of speech, provide for speech waveform matching, and "optimize" the coder's performance for the human ear. A number of these coders have already been adopted in national and international cel

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18

Marques, Mario Rui Monteiro. "Performance analysis of an alternative to trellis coded modulation for waveforms transmitted over a channel with pulse-noise interference." Thesis, Monterey, Calif. : Naval Postgraduate School, 2008. http://bosun.nps.edu/uhtbin/hyperion-image.exe/08Jun%5FMarques.pdf.

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Анотація:

Thesis (M.S. in Electrical Engineering and M.S. in Electronic Warfare System Engineering)--Naval Postgraduate School, June 2008.<br>Thesis Advisor(s): Robertson, Clark. "June 2008." Description based on title screen as viewed on August 21, 2008. Includes bibliographical references (p. 39). Also available in print.

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19

Burwell, Alex. "Experimental Testing and Evaluation of Orthogonal Waveforms for MIMO Radar with an Emphasis on Modified Golay Codes." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1405701478.

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20

Stokes, Andrew J. "Interferometric Synthetic Aperture Ladar Using Code Division Multiple Access Apertures." University of Dayton / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1511789594365428.

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21

Touati, Nadjah. "Optimisation des formes d'ondes d'un radar d'aide à la conduite automobile, robustes vis-à-vis d'environnements électromagnétiques dégradés." Thesis, Valenciennes, 2015. http://www.theses.fr/2015VALE0031/document.

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Анотація:

Divers radars sont développés pour des besoins d’aide à la conduite automobile de sécurité mais aussi de confort. Ils ont pour but de détecter la présence d’obstacles routiers afin d’éviter d’éventuelles collisions. La demande actuelle en termes de capteurs radars pour l’automobile connaît une croissance importante et les technologies employées doivent garantir de bonnes performances dans un environnement dégradé par les signaux interférents des autres utilisateurs. Dans cette thèse, nous nous intéressons au développement d’un système radar performant en tout lieu et en particulier dans un con

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22

Arlery, Fabien. "Formes d’ondes MSPSR, traitements et performances associés." Thesis, Evry, Institut national des télécommunications, 2017. http://www.theses.fr/2017TELE0005/document.

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Aujourd’hui, les systèmes MSPSR (Multi-Static Primary Surveillance Radar) passifs se sont installés de manière durable dans le paysage de la surveillance aérienne [1]. L’intérêt que suscitent ces nouveaux systèmes provient du fait qu’en comparaison aux radars mono-statiques utilisés actuellement, les systèmes MSPSR reposent sur une distribution spatiale d’émetteurs et de récepteurs offrant des avantages en termes de fiabilité (redondance), de coûts (absence de joints tournants et émetteurs moins puissants) et de performances (diversité spatiale). Toutefois, le défaut majeur du MSPSR passif rés

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23

Arlery, Fabien. "Formes d’ondes MSPSR, traitements et performances associés." Electronic Thesis or Diss., Evry, Institut national des télécommunications, 2017. http://www.theses.fr/2017TELE0005.

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Анотація:

Aujourd’hui, les systèmes MSPSR (Multi-Static Primary Surveillance Radar) passifs se sont installés de manière durable dans le paysage de la surveillance aérienne [1]. L’intérêt que suscitent ces nouveaux systèmes provient du fait qu’en comparaison aux radars mono-statiques utilisés actuellement, les systèmes MSPSR reposent sur une distribution spatiale d’émetteurs et de récepteurs offrant des avantages en termes de fiabilité (redondance), de coûts (absence de joints tournants et émetteurs moins puissants) et de performances (diversité spatiale). Toutefois, le défaut majeur du MSPSR passif rés

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24

Benghuzzi, Mohsin M. Gross Frank B. "Passive detection suppression of cyclostationary phase coded waveforms." 2003. http://etd.lib.fsu.edu/theses/available/etd-09042003-145334/.

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Thesis (Ph. D.)--Florida State University, 2003.<br>Advisor: Dr. Frank Gross, Florida State University, FAMU-FSU College of Engineering, Dept. of Electrical and Computer Engineering. Title and description from dissertation home page (viewed Oct. 3, 2003). Includes bibliographical references.

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25

Cheng, Yun-Chien, and 鄭雲謙. "The applications of coded waveforms in pulse inversion fundamental imaging." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/26306417468954876819.

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碩士<br>國立臺灣大學<br>電機工程學研究所<br>94<br>In medical ultrasound imaging, micro bubble contrast agents are used to improve the contrast between blood perfusion region and soft tissue. Micro bubble oscillation produces stronger nonlinear response than tissue. Pulse inversion (PI) imaging excites two phase inverted pulses and sums the echoes to cancel the linearly propagated signal and keep the nonlinear components. The imaging keeping fundamental part of residue by filtering is called PI fundamental imaging. Generally, PI fundamental imaging has better contrast to tissue ration than traditional fundamen

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26

Anangi, Sailaja. "New Approaches to Pulse Compression Techniques of Phase-Coded Waveforms in Radar." Thesis, 2010. http://ethesis.nitrkl.ac.in/1993/1/SAILAJA(208EC108).pdf.

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The present thesis aims to make an in-depth study of Radar pulse compression, Neural Networks and Phase coded pulse compression codes. Pulse compression is a method which combines the high energy of a longer pulse width with the high resolution of a narrow pulse width. The major aspects that are considered for a pulse compression technique are signal to sidelobe ratio (SSR) performance, noise performance and Doppler shift performance. Matched filtering of biphase coded radar signals create unwanted sidelobes which may mask important information. The adaptive filtering techniques like Least Mea

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27

Wei-linYe and 葉威麟. "Phase Shift Effect on Linear Discriminations over Optical Spectral-Phase Coded Signal Waveforms." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/45223959169334458518.

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碩士<br>國立成功大學<br>電腦與通信工程研究所<br>103<br>In recent years, optical code-division multiple-access (OCDMA) systems have been proposed for multiple accesses to utilize the vast bandwidth available in optical fiber. Optical CDMA systems are believed to provide asynchronous access for each user in the system, which is especially suitable for usage in local area network (LAN). We propose an optical code-division multiple-access (SPE-OCDMA) codecs scheme for proof-of-concept demonstration. The spectrally phase- codecs are constructed with Liquid-Crystal Spatial-Light Modulator (LC-SLM), Mach-Zehnder In

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28

Zarifi, Keyvan. "Blind Signature Waveform Estimation and Linear Multiuser Detection in Direct Sequence Code Division Multiple Access Systems." Phd thesis, 2007. https://tuprints.ulb.tu-darmstadt.de/837/1/converted_simplified_thesis.pdf.

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Direct-sequence code-division multiple-access (DS-CDMA) technology is a popular communication scheme adopted for the third generation (3G) wireless communication systems and beyond. Computationally efficient linear multiuser detection techniques can significantly improve the capacity of DS-CDMA systems by taking into account not only the signature of the user-of-interest but also those of the interfering users. However, as the spread spectrum DS-CDMA signals are usually subject to frequency-selective fading, a mismatch between the presumed and the actual user signatures is a typical challenge

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29

Zarifi, Keyvan [Verfasser]. "Blind signature waveform estimation and linear multiuser detection in direct sequence code division multiple access systems / von Keyvan Zarifi." 2007. http://d-nb.info/984882111/34.

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30

"low bit rate speech coder based on waveform interpolation =: 基於波形預測方法的低比特率語音編碼". 1999. http://library.cuhk.edu.hk/record=b5889941.

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by Ge Gao.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 1999.<br>Includes bibliographical references (leaves 101-107).<br>Text in English; abstracts in English and Chinese.<br>by Ge Gao.<br>Chapter 1 --- Introduction --- p.1<br>Chapter 1.1 --- Attributes of speech coders --- p.1<br>Chapter 1.1.1 --- Bit rate --- p.2<br>Chapter 1.1.2 --- Speech quality --- p.3<br>Chapter 1.1.3 --- Complexity --- p.3<br>Chapter 1.1.4 --- Delay --- p.4<br>Chapter 1.1.5 --- Channel-error sensitivity --- p.4<br>Chapter 1.2 --- Development of speech coding techniques --- p.5<br>Chapter 1.3 --- Motiv

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