Dissertations / Theses on the topic 'Transmitter systems'
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Malkin, Moshe H. "Optimized transmitter-based signal processing for multicarrier systems /." May be available electronically:, 2009. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.
Full textDi, Rosa Gabriele. "Impact of Transmitter Distortion on Coherent Optical Systems." Thesis, KTH, Tillämpad fysik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-240386.
Full textChu, Min. "Phase-shifting techniques for wireless multiple-antenna transmitter applications /." Thesis, Connect to this title online; UW restricted, 2006. http://hdl.handle.net/1773/6002.
Full textHuang, Jinliang. "Adaptive MIMO Systems with Channel State Information at Transmitter." Doctoral thesis, KTH, Kommunikationssystem, CoS, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9777.
Full textQC 20100812
Mella, Evans Epafras. "Transmitter precoding and receiver processing for broadband wireless systems." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611880.
Full textHuang, Jin Liang. "Adaptive MIMO systems with channel state information at transmitter /." Stockholm : KTH Information and Communication Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9777.
Full textEckler, Kyle. "Prototype MIMO Transmitter for Spin Stabilized Vehicles." International Foundation for Telemetering, 2011. http://hdl.handle.net/10150/595804.
Full textThis paper describes the design of an inexpensive and scalable transmitter for a Multiple-Input Multiple-Output (MIMO) communication system. The transmitter is intended to be used in aerospace applications, especially in spin stabilized vehicles. A field programmable gate array (FPGA) in the modulator will implement a modified Alamouti space time block code which will take advantage of the cyclostationary nature of the channel to increase the system data rate.
Daempfling, Hauke C. "Design and implementation of the precision personnel locator digital transmitter system." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-122006-161049/.
Full textKeywords: precision personnel locator; digital systems; embedded systems; waveform generation; data communication. Includes bibliographical references (leaves 108-110).
Lee, See Taur. "Quad-band global system for mobile communications complementary metal-oxide-semiconductor transmitter /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/6122.
Full textHe, Jian. "Global Optimization of Transmitter Placement for Indoor Wireless Communication Systems." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34817.
Full textMaster of Science
Banks, Robert Edward. "The use of transmitter power control in land mobile radio systems." Thesis, University of Bath, 1987. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760571.
Full textSung, Joon Hyun. "Transmitter Strategies for Closed-Loop MIMO-OFDM." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5029.
Full textLee, King F. "Space-time and space-frequency coded orthogonal frequency division multiplexing transmitter diversity techniques." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14981.
Full textSankaran, Mahadevan. "Transparent Asynchronous Transmitter Receiver Interface (TAXI) communications for fiber optic data links." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-01102009-063748/.
Full textPascual, Iserte Antonio. "Channel state Information and joint transmitter-receiver design in multi-antenna systems." Doctoral thesis, Universitat Politècnica de Catalunya, 2005. http://hdl.handle.net/10803/6890.
Full textEl objetivo es diseñar conjuntamente el transmisor y el receptor, lo que depende directamente de la calidad y la cantidad de información del canal de la que se dispone. En esta tesis se analiza el impacto de dicha información en el diseño.
Primero se ha estudiado un sistema MIMO de un único usuario usando la modulación orthogonal frequency division multiplexing (OFDM) y asumiendo un conocimiento perfecto del canal en ambos extremos. La arquitectura propuesta se basa en conformación conjunta por portadora, calculándose los conformadores óptimos y proponiéndose diversas estrategias de distribución de potencia entre las portadoras con una baja complejidad. Se han analizado también las relaciones asintóticas de estas distribuciones de potencia con otras soluciones clásicas con mayor coste.
El diseño anterior se ha extendido a sistemas MIMO multiusuario, donde todos los terminales en el escenario tienen más de una antena y la información del canal es perfecta. El objetivo es la minimización de la potencia total transmitida sujeto a restricciones de tasa de error máxima para cada enlace. El problema matemático obtenido es no convexo, por lo que estrategias clásicas basadas en algoritmos de gradiente o de optimización sucesiva pueden llevar a soluciones subóptimas. Como posible alternativa se ha propuesto la aplicación de simulated annealing, una potente herramienta heurística y estocástica que permite hallar el diseño global óptimo incluso cuando el problema es no convexo.
Los errores en la información de canal disponible pueden empeorar el rendimiento del sistema si éstos no se tienen en cuenta explícitamente durante el diseño. La degradación del sistema MIMO-OFDM de un único usuario se ha estudiado en esta situación, obteniendo una expresión analítica de una cota superior de la máxima degradación relativa de la relación señal a ruido más interferencia.
El rendimiento se puede mejorar usando técnicas robustas que tengan en cuenta la presencia de dichos errores. Existen dos aproximaciones clásicas: las Bayesianas y las maximin. En las soluciones Bayesianas el problema se formula estadísticamente, donde el objetivo es optimizar el valor medio de una función de rendimiento promediada sobre la estadística del canal real condicionado a su estimación. Por otro lado, los diseños maximin se caracterizan por optimizar el peor rendimiento para cualquier posible error en la información del canal dentro de una cierta región de incertidumbre que modela el conocimiento imperfecto del mismo.
Se han mostrado dos ejemplos de diseños Bayesianos. Primero, una distribución de potencia en un sistema OFDM de una única antena que minimiza el valor medio de una cota superior de la tasa de error, y después un diseño de un transmisor multiantena con un banco de filtros que maximiza la relación señal a ruido media (SNR) o minimiza el error cuadrático medio.
Finalmente, se ha obtenido el diseño robusto maximin de un sistema MIMO de un único usuario donde en el transmisor se combinan un código bloque ortogonal espacio-tiempo, una distribución de potencia y un banco de conformadores correspondientes a los modos espaciales del canal estimado. La distribución de potencia se ha diseñado acorde a una región de incertidumbre para el error en la estimación de canal de manera que se maximiza la peor SNR en dicha región. Posteriormente, este diseño se ha extendido al caso de modulaciones adaptativas y multiportadora, mostrando que el rendimiento es mejor que para los códigos bloque otrogonales y la conformación no robusta.
This Ph.D. dissertation addresses the design of multi-antenna systems, where the most general case corresponds to a transmitter and a receiver with more than one antenna, i.e., a multiple-input-multiple-output (MIMO) channel. The main advantage is that they can provide a much better performance than single-antenna systems, both in terms of transmission quality and system capacity, i.e., number of users that can be served simultaneously.
The objective is to carry out a joint transmitter-receiver design, which depends directly on the quantity and the quality of the available channel state information (CSI). In this dissertation, the impact of the CSI on the design has been analyzed.
First, a single-user MIMO communication system has been designed assuming the use of the orthogonal frequency division multiplexing (OFDM) modulation and according to a perfect CSI at both sides. The proposed architecture is based on a joint beamforming approach per carrier. The optimum beamvectors have been calculated and several power allocation strategies among the subcarriers have been derived. These power allocation solutions have been shown to be asymptotically related to other classical designs but with a much lower computational load.
The previous design has been extended to multi-user communications, where the multi-antenna terminals in the scenario have a perfect CSI. The objective is the minimization of the total transmit power subject to maximum bit error rate (BER) constraints for each link. The mathematical optimization problem is non-convex and, therefore, classical solutions based on gradient search or alternate & maximize schemes may find a local suboptimum design. As a possible solution, the application of the simulated annealing technique has been proposed, a powerful stochastic optimization tool able to find the global optimum design even when the problem is non-convex.
The errors in the available CSI may decrease importantly the system performance if they are not taken into account explicitly in the design. This degradation has been studied for the single-user MIMO-OFDM system. An analytical expression of an upper-bound on the maximum relative signal to noise plus interference ratio degradation has been found.
The system performance can be improved when exploiting an imperfect CSI by using adequate robustness strategies. Two robust approaches have been proposed: the Bayesian and the maximin solutions. The Bayesian approach is a full statistical solution that optimizes the mean value of the performance function averaged over the statistics of the actual channel and the errors in the CSI. On the other hand, the maximin approach provides a design that optimizes the worst system performance for any possible error in a predefined uncertainty region.
Two simple examples of Bayesian designs have been provided. First, a power allocation has been derived for an OFDM system with one transmit and one receive antenna minimizing the mean value of an upper-bound on the BER. Afterwards, a design of a multi-antenna transmitter with a bank of filters and a single-antenna receiver has been proposed, whose objective is either the maximization of the mean signal to noise ratio (SNR) or the minimization of the mean square error.
Finally, a robust maximin design has been proposed for a single-user MIMO system, in which the transmitter is based on the combination of an orthogonal space time block code (OSTBC), a power allocation stage, and a set of beamformers coupling the transmission through the estimated channel eigenmodes. The power allocation has been found according to a channel estimate and an uncertainty region for the error in this estimate, so that the worst SNR for any error in the uncertainty region is maximized. This design has been then extended and applied to adaptive modulation schemes and multicarrier modulations, showing that the performance is much better than that achieved by a pure OSTBC solution or a non-robust beamforming scheme.
Peiris, Bemini Hennadige Janath. "Resource allocation in DS-CDMA systems with side information at the transmitter." Texas A&M University, 2006. http://hdl.handle.net/1969.1/5004.
Full textZhou, Lin. "Energy efficient transmitter design with compact antenna for future wireless communication systems." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/33104.
Full textKim, Kwan-Woo. "A fully-integrated all-digital outphasing transmitter for wireless communications." Diss., Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/37263.
Full textHuang, Jinliang. "Adaptation in multiple input multiple output systems with channel state information at transmitter." Licentiate thesis, Stockholm : Institutionen för elektronik, dator- och programvarusystem, Kungliga tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4443.
Full textKim, Hyung Joon. "Multi-standard radio transceiver architectures and radio frequency front-end design." Connect to this title online, 2005. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1110399471.
Full textTitle from first page of PDF file. Document formatted into pages; contains xv, 128 p.; also includes graphics (some col.). Includes bibliographical references (p. 125-128). Available online via OhioLINK's ETD Center
Lee, Chang-Ho. "Design and development of a ku-band transmitter for satellite communication applications." Diss., Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14722.
Full textImboden, Christoph Georg. "Identification of nonpersistently excited Volterra systems : applied to the linearisation of a high power transmitter /." [S.l.] : [s.n.], 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=11185.
Full textZakaria, Rostom. "Transmitter and receiver design for inherent interference cancellation in MIMO filter-bank based multicarrier systems." Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00923184.
Full textHur, Joonhoi. "A highly linear and efficient out-phasing transmitter for multi-band, multi-mode applications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42823.
Full textLeung, Matthew Chung-Hin. "CMOS RF SOC Transmitter Front-End, Power Management and Digital Analog Interface." Thesis, Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24664.
Full textSmith, Stephen E. "An investigation of the effects of electroconvulsive shock on mesolimbic dopamine and amino acid transmitter systems." Thesis, University of Oxford, 1995. http://ora.ox.ac.uk/objects/uuid:6dc583e0-cb02-4550-87cb-195ac4264f3e.
Full textHolguín-Sánchez, Fausto Daniel. "Spectral Shape Division Multiplexing (SSDM): Apparatus, Transmitter, Receiver and Detection." DigitalCommons@CalPoly, 2012. https://digitalcommons.calpoly.edu/theses/800.
Full textHe, Xin, and 何鑫. "Probabilistic quality-of-service constrained robust transceiver designin multiple antenna systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48199527.
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Electrical and Electronic Engineering
Master
Master of Philosophy
Tirunelveli, Kanthi Saravanan. "Analysis and; design of successive approximation ADC and 3.5 GHz RF transmitter in 90nm CMOS." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33884.
Full textHanay, Oner [Verfasser], Renato [Akademischer Betreuer] Negra, and Gerd [Akademischer Betreuer] Ascheid. "Fourier-domain data-converters : new concepts for high data rate wireless transmitter systems / Oner Hanay ; Renato Negra, Gerd Ascheid." Aachen : Universitätsbibliothek der RWTH Aachen, 2020. http://d-nb.info/122799267X/34.
Full textSelbrede, Robert W., and Ronald Pozmantier. "INTEGRATION OF S-BAND FQPSK TELEMETRY TRANSMITTERS AND GPS-BASED TSPI SYSTEMS WITH CLOSELY SPACED ANTENNAE – A SUCCESS STORY." International Foundation for Telemetering, 2004. http://hdl.handle.net/10150/605322.
Full textModern spectrally efficient telemetry transmitters are beginning to find their way on a variety of airborne test platforms. Many of these platforms also include Global Positioning System (GPS)-based Time-Space-Position-Information (TSPI) instrumentation systems. Due to space and other limitations, many of these platforms have demanding antenna placement limitations requiring closely spaced antennas. This paper describes steps taken to identify and mitigate potential interference to GPS-based TSPI instrumentation systems by these new technology transmitters. Equipment characterization was accomplished to determine interference potential of the proposed new transmitters and susceptibility of several GPS TSPI receivers. Several filtering techniques were identified as possible solutions to the anticipated interference problems. Telemetry (TM)/GPS system mockups and laboratory tests of the same were accomplished. Open-air testing was then accomplished to validate laboratory results. Finally, on aircraft tests were accomplished prior to performing any aircraft system modifications. Results of these test efforts are presented for others to consider when planning similar modifications to other platforms.
Zhao, Shaohua, and 趙少華. "The design of transmitter/receiver and high speed analog to digital converters in wireless communication systems: a convex programming approach." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B41290525.
Full textZhao, Shaohua. "The design of transmitter/receiver and high speed analog to digital converters in wireless communication systems : a convex programming approach /." Click to view the E-thesis via HKUTO, 2008. http://sunzi.lib.hku.hk/hkuto/record/B41290525.
Full textPan, Bo. "Development of micromachined millimeter-wave modules for next-generation wireless transceiver front-ends." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24654.
Full textCommittee Chair: John Papapolymerou; Committee Chair: Manos Tentzeris; Committee Member: Gordon Stuber; Committee Member: John Cressler; Committee Member: John Z. Zhang; Committee Member: Joy Laskar
Lee, Kil-Hoon. "Design of signal integrity enhancement circuits." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37191.
Full textChen, Ting. "Energy-Efficient Resource Allocation in OFDMA Systems." Thesis, Linköpings universitet, Kommunikations- och transportsystem, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-98683.
Full textHorta, Ricardo de Lins e. "Consequences of adversity on the development of attachment-related neuro transmitter systems: integrative review and analysis of Brazilian federal policies for early childhood." Universidade Federal de Minas Gerais, 2012. http://hdl.handle.net/1843/BUOS-94MJMM.
Full textXing, Chengwen, and 邢成文. "Linear minimum mean-square-error transceiver design for amplify-and-forward multiple antenna relaying systems." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B44769738.
Full textSekkiou, Imene. "Design of communication systems based on broadband sources for fiber and free space optical links." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172542.
Full text[CA] Les comunicacions òptiques sense fils (OWC) constitueixen una tecnologia molt prometedora per al desenvolupament de futures comunicacions sense fils. De fet, ha despertat un interés creixent entre els investigadors i diverses empreses de tot el món treballen actualment en el desenvolupament de xarxes sense fils de molt alta velocitat. Les comunitats científica i industrial consideren la OWC com una tecnologia complementària en les seues diverses formes: comunicacions òptiques en l'espai lliure (FSO), comunicacions de llum visible (VLC) o fidelitat de la llum (Li-Fi). L'espectre òptic ha sigut considerat durant molts anys com una gran oportunitat per a les comunicacions sense fils, especialment a causa de la saturació de l'espectre de radiofreqüència (RF). Aquesta dissertació tracta de l'ús de fonts de banda ampla en sistemes de transmissió de llum visible (VLC), així com en sistemes de transmissió en l'espectre infraroig per fibra òptica. En el treball de recerca realitzat es poden distingir tres parts: ¿ En la primera part, es considera l'estudi i la simulació de components de Díodes Emissors de Llum (LED) amb el software WIEN2k centrant-se en les propietats òptiques i elèctriques dels elements II-VI. ¿ La segona part tracta del disseny, la implementació i les proves de diferents prototips de comunicació VLC per a la transmissió analògica i digital de manera simplex i semidúplex. Hem demostrat un sistema OWC emprant una font de banda ampla (LED) per a la transmissió no sols de dades, sinó també per a la transmissió sense fil d'energia. A més, s'aborda el problema de la sincronització i la detecció del nivell "1" o "0" d'un bit en els sistemes de comunicació sense fil òptica implementats, que sorgeix a conseqüència de l'atenuació de la llum al llarg de la distància i al problema de la pèrdua de línia de visió (NLOS) entre l'emissor i el receptor. Per a fer front a aquest problema, s'ha proporcionat un protocol de comunicació que garanteix la transmissió fiable de dades digitals amb un algorisme de detecció de nivell de bits adaptatiu i s'ha demostrat la seua eficàcia mitjançant la transmissió de textos i imatges. ¿ A més, aquesta tesi aporta una solució per a la implementació de transmissors multiplexats en xarxes amb divisió de longitud d'ona (WDM) per a formats de modulació amb multiplexació per divisió de freqüència ortogonal (OFDM) basats en l'ús de fonts de banda ampla en l'espectre infraroig per a xarxes de fibra bidireccionals centralitzades. Malgrat les limitacions imposades per la dispersió cromàtica en l'ús d'aquest tipus de fonts òptiques, la inclusió d'unes certes estructures abans de la detecció permet la transmissió de senyals OFDM en enllaços òptics. En aquest treball s'ha demostrat experimentalment la reutilització de portadores, l'assignació dinàmica d'amplada de banda i la transmissió de senyals OFDM multibanda mitjançant l'ús de fonts òptiques de banda ampla en xarxes WDM. Els principals resultats obtinguts en cada part d'aquesta tesi doctoral mostren els procediments d'estudi, l'eficàcia de les solucions proposades i les limitacions trobades.
[EN] Optical wireless communication (OWC) is a very promising technology for future wireless communications developments. It has attracted increasing interest from researchers and several companies around the world are currently working on the development of very high-speed wireless networks. The scientific and industrial communities believe that OWC will be a complementary technology in its various forms: Free Space Optical communications (FSO), Visible Light Communications (VLC), Light Fidelity (Li-Fi). In fact, the optical spectrum has been considered for many years as a great opportunity for wireless communications especially due to the saturation of the radio frequency (RF) spectrum. This dissertation deals with the use of broadband sources in visible light transmission systems (VLC) as well as fiber optic systems. To carry out the research, three parts can be distinguished: In the first part, we consider the study and simulation of Light Emitting Diode (LED) components with the WIEN2k software by focusing on the optical and electrical properties of elements II-VI. The second part deals with the design, implementation and testing of different VLC communication prototypes for analog and digital transmission in simplex and half-duplex mode. We have demonstrated that an OWC system using a broadband source (i.e. an LED) can be used not only for data transmission, but also for wireless power transmission. Moreover, the synchronization problem and the detection of level "1" or "0" of a bit often arise in the optical wireless communication systems. This is a result of the attenuation nature of the light over the distance and the problem of Non Line-Of-Sight (NLOS) between the emitter and the receiver. To deal with this problem, a communication protocol ensuring reliable digital data transmission with an adaptive bit level detection algorithm has been provided and its effectiveness has been demonstrated by the transmission of texts and images. In addition, this thesis provides a solution for the implementation of wavelength division multiplexed - orthogonal frequency division multiplexed (WDM-OFDM) transmitters based on the use of broadband sources in the infrared spectrum for centralized bidirectional fiber networks. Despite the chromatic dispersion that avoids the use of this type of optical sources, the inclusion of certain structures before detection allows the transmission of OFDM signals in optical links. Carrier reuse, dynamic bandwidth allocation and multiband OFDM signals transmission will be experimentally demonstrated by using optical broadband sources in WDM networks. The main results obtained during this thesis work demonstrate the study procedures, for each part, the effectiveness of the proposed solutions as well as the constraints encountered.
Sekkiou, I. (2021). Design of communication systems based on broadband sources for fiber and free space optical links [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/172542
TESIS
Pendyala, Chandra Mohan. "On the optimal location of transmitters for micro-cellular radio communication system design." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-07112009-040406/.
Full textKhlif, Wassim. "Design of Tunable Low-Noise Amplifier in 0.13um CMOS Technology for Multistandard RF Transceivers." Digital WPI, 2007. https://digitalcommons.wpi.edu/etd-theses/714.
Full textBose, Biswojit. "Bit error rate estimation in WiMAX communications at vehicular speeds using Nakagami-m fading model." Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2013. https://ro.ecu.edu.au/theses/530.
Full textNystøyl, Bjarte Løken. "HDMI Transmitter." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18483.
Full textToonstra, Jason Paul. "A radio transmitter fingerprinting system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23529.pdf.
Full textKim, Hyungwook. "CMOS radio-frequency power amplifiers for multi-standard wireless communications." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44786.
Full textKumar, Ajay. "A wide dynamic range high-q high-frequency bandpass." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/28126.
Full textCommittee Chair: Allen Phillip; Committee Member: Hasler Paul; Committee Member: Keezer David; Committee Member: Kenny James; Committee Member: Pan Ronghua.
Barale, Francesco. "Design of integrated frequency synthesizers and clock-data recovery for 60 GHz wireless communications." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37216.
Full textSun, Luotao. "A fast radio transmitter identification system." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ41785.pdf.
Full textAl, Mahmud Shamsul Arefeen. "Wireless Power Transfer : Machine Learning Assisted Characteristics Prediction for Effective Wireless Power Transfer Systems." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286673.
Full textEn av de viktigaste utmaningarna med trådlösa kraftöverföring enheter är degraderingen av prestandan när mottagarens position och egenskaper varierar. Variationerna av systemets parametrar, såsom belastningsmotstånd och kopplings styrka i WPT-anordning, påverkar prestanda egenskaperna såsom spänning och effekt. När system parametrarna skiljer sig från de optimala drifts förhållandena, försämras prestandan. Därför måste luftmotståndet och kopplings styrkan övervakas, för att göra nödvändig optimering och kontroll. Sådana styrmetoder kräver emellertid ytterligare avkännings kretsar, och en data kommunikationslänk mellan sändar- och mottagarsidan. Denna studie föreslår ett nytt maskininlärning assisterat WPT-system, som förutsäger kraften som levereras till mottagaren genom att endast använda mätningar på sändarsidan. Dessutom föreslås en metod för att detektera belastningsimpedans och kopplings koefficient med användning av maskin inlärningsmetoder. Vi studerar vilka parametrar som är mätbara på sändarsidan och som kan användas för att förutsäga utgången effekten som levereras till mottagare vid varierande belastningsmotstånd och kopplings nivåer. I den föreslagna metoden förutses framgångs effekten för ett induktor-kondensator-kondensator LCCserie avstämt WPT-system endast framgångsrikt med hjälp av det uppmätta effektivvärdet för ingångs strömmen. Slumpmässig skogsalgoritm har visat exceptionell noggrannhet för att uppskatta uteffekten endast baserat på sändarsidans parametrar. Den föreslagna metoden valideras experimentellt med användning av en laboratorium prototyp. Harmoniska komponenter i ingångs strömmen används för att framgångsrikt bedöma last motståndet och kopplings koefficienten. Multi-utgångsregression har verkat vara mycket exakt för att uppskatta belastningsimpedans och kopplingskoefficient. Den föreslagna maskininlärning algoritmen används också för att klassificera start-och-off-regimer för att säkerställa hög effektiv drift.
Korol, Victor. "The predistortion system for an ultrawideband transmitter." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p1470298.
Full textTitle from first page of PDF file (viewed December 2, 2009). Available via ProQuest Digital Dissertations. Includes bibliographical references (p. 29).