Tesis sobre el tema "OFDM"
Crea una cita precisa en los estilos APA, MLA, Chicago, Harvard y otros
Consulte los 50 mejores tesis para su investigación sobre el tema "OFDM".
Junto a cada fuente en la lista de referencias hay un botón "Agregar a la bibliografía". Pulsa este botón, y generaremos automáticamente la referencia bibliográfica para la obra elegida en el estilo de cita que necesites: APA, MLA, Harvard, Vancouver, Chicago, etc.
También puede descargar el texto completo de la publicación académica en formato pdf y leer en línea su resumen siempre que esté disponible en los metadatos.
Explore tesis sobre una amplia variedad de disciplinas y organice su bibliografía correctamente.
Nowak, Dan. "Adaptivní OFDM". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2011. http://www.nusl.cz/ntk/nusl-219140.
Texto completoGharba, Mohamed. "Study and evaluation of a frequential multiplexing based on OFDM/OQAM". Phd thesis, Conservatoire national des arts et metiers - CNAM, 2012. http://tel.archives-ouvertes.fr/tel-00767401.
Texto completoWang, Tiejun. "Mobile OFDM communications". Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3211276.
Texto completoTitle from first page of PDF file (viewed June 7, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 104-111).
Armour, Simon Martin Daniel. "Combined OFDM-equalisation". Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369530.
Texto completoXu, Lei. "OFDM turbo transceivers". Thesis, University of Southampton, 2008. https://eprints.soton.ac.uk/64480/.
Texto completoGui, Bo. "Cooperative OFDM networking". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 156 p, 2009. http://proquest.umi.com/pqdweb?did=1654493791&sid=1&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Texto completoSkrzypczak, Alexandre. "Contribution à l'étude des modulations multiporteuses OFDM / OQAM et OFDM suréchantillonnées". Rennes 1, 2007. http://www.theses.fr/2007REN1S136.
Texto completoNowadays, for the transmission over multipath fading channel, the choice of multicarrier solutions becomes more and more frequent because of their remarkable robustness with respect to frequency selective distortions. The OFDM solution then stands for a reference modulation. However, this modulation, based on a rectangular pulse shape, exhibits some noticeable drawbacks, like a power spectral density with high sidelobes. In order to cope with this problem, new solutions have been developed using non-rectangular pulse shapes. Nevertheless, modulations like OFDM/OQAM and oversampled OFDM lead to specific constraints. This Ph. D. Thesis aims at studying these pulse-shaped multicarrier modulations on several critical aspects of transmission. We focus on the study of the power spectral density, the PAPR and its reduction, and the channel estimation problem. We finally apply these solutions to power line communications
Serener, Ali. "Optimization of short block length LDPC codes for OFDM and spread OFDM /". Search for this dissertation online, 2005. http://wwwlib.umi.com/cr/ksu/main.
Texto completoKarampatsis, Dimitrios. "Modelling and performance assessment of OFDM and fast-OFDM wireless communication systems". Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446778/.
Texto completoCheung, Bing-Leung Patrick. "Simulation of Adaptive Array Algorithms for OFDM and Adaptive Vector OFDM Systems". Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/34915.
Texto completoMaster of Science
Prasetyo, Bhimantoro Yudho. "Synchronisation in OFDM systems". Thesis, King's College London (University of London), 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.252282.
Texto completoTan, Edward S. "Hyper-wideband OFDM system". Thesis, Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/55056.
Texto completoIlunga, Lou. "Adaptive, Turbo-coded OFDM". Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/34578.
Texto completo
In this thesis, we enhance the system throughput of a working OFDM system by adding turbo coding and adaptive modulation (AD). Simulation is done over a time varying, frequency selective Rayleigh fading channel. The temporal variations in the simulated wireless channel are due to the presence of Doppler, a sign of relative motion between transmitter and receiver. The wideband system has 48 data sub-channels, each is individually modulated according to channel state information acquired during the previous burst. The end goal is to increase the system throughput while maintaining system performance under a bit error
rate (BER) of 10-2. The results we obtained are preliminary. The lack of resources prevented us from producing detailed graphs of our findings.
Master of Science
Montojo-Bennassar, Juan I. "Adaptive OFDM-based UWB". Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3356337.
Texto completoTitle from first page of PDF file (viewed July 9, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 114-118).
Fischer, Volker. "Aufwandsgünstige Verfahren zur Interkanalinterferenzunterdrückung bei OFDM /". Göttingen : Sierke, 2008. http://d-nb.info/99084692X/04.
Texto completoRaileanu, Alexandru. "Sistemi OFDM: prestazioni di livello fisico". Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amslaurea.unibo.it/2405/.
Texto completoZhou, Wen y 周雯. "A study of channel estimation for OFDM systems and system capacity forMIMO-OFDM systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45555850.
Texto completoThompson, Steve C. "Constant envelope OFDM phase modulation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2005. http://wwwlib.umi.com/cr/ucsd/fullcit?p3208635.
Texto completoOsesina, Olukayode Isaac, Yafan Zhang y Shirisha Pagoti. "OFDM Carrier Frequency Offset Estimation". Thesis, Karlstad University, Division for Information Technology, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-343.
Texto completoThis thesis discusses and investigates the estimation of carrier offset frequency in
orthogonal frequency division multiplexing (OFDM) mobile systems. The investigation
starts by using Mobile WiMAX wireless communication specifications described
in IEEE 802.16e as the primary system setup. Under this setup orthogonal
frequency division multiple access (OFDMA) is used as a physical layer scheme; it
also involves the use of pilots in the OFDM symbol for channel estimation.
Although OFDM is resistant to multipath fading, it requires a high degree of synchronisation
to maintain sub-carrier orthogonality. Therefore the level of performance
of the system depends first on the accuracy in estimating the carrier frequency
offset and then the estimation of the channel. Maximum likelihood estimator
is used for estimating carrier frequency offset; its performance under different conditions
for example SNR, number of virtual carriers needed for estimation etc. are
simulated and compared with theoretical results. The optimality of IEEE 802.16e
specifications was also examined during the simulations and results analysis.
Gursan, Hakan Yesari. "Frame Synchronization In Ofdm Systems". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605782/index.pdf.
Texto completoGurel, Ilker. "Channel Estimation For Ofdm Systems". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606940/index.pdf.
Texto completoFifield, Jeffrey M. "A software defined OFDM modulator". Diss., Connect to online resource, 2006. 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:1439452.
Texto completoChen, Zhiqiang. "Cyclic prefix in OFDM systems". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558332.
Texto completoNyirongo, Nyembezi. "Optimization Stratergies for OFDM Communications". Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490341.
Texto completoChen, Zhiqiang y 陳志強. "Cyclic prefix in OFDM systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558332.
Texto completoLam, Chi Wa. "Synchronization in OFDM communication systems". Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/928/.
Texto completoKamirah, Daniel K. "OFDM Performance on Aeronautical Channnels". International Foundation for Telemetering, 2009. http://hdl.handle.net/10150/606130.
Texto completoThis paper provides an introduction to the Orthogonal Frequency Division Multiplexing (OFDM) scheme which has been proposed for future aeronautical telemetry applications. OFDM offers the potential for high data rates on radio channels with multipath such as aeronautical telemetry channels. This paper provides in introduction to OFDM and demonstrates how orthogonality is maintained over multipath channels by the introduction of a guard band and by the inclusion of a cyclic prefix. The simulation of OFDM in multipath is simulated and performance results are presented that show the degradation of this scheme on a multipath channel with and without the guard band and the cyclic prefix.
Rice, Michael y Kenneth Welling. "CODED OFDM FOR AERONAUTICAL TELEMETRY". International Foundation for Telemetering, 2000. http://hdl.handle.net/10150/606496.
Texto completoThree Quadrature Phase Shift Keying (QPSK) mapped COFDM systems demonstrating a continuum of complexity levels are simulated over an evolving three ray model of the multipath fading channel with parameters interpolated from actual channel sounding experiments. The first COFDM system uses coherent QPSK and convolutional coding with interleaving in frequency, channel equalization and soft decision decoding; the second uses convolutional coding with interleaving in frequency, Differential Phase Shift Keying (DPSK) and soft decision decoding; the third system uses a quaternary BCH code with DPSK mapping and Error and Erasure Decoding (EED). All three systems are shown to be able to provide reliable data communication during frequency selective fade events. Simulations demonstrate QPSK mapped COFDM with reasonable complexity performs well in a multipath frequency selective fading environment under parameters typically encountered in aeronautical telemetry.
Said, Fatin. "Turbo coding from OFDM systems". Thesis, King's College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394250.
Texto completoThottappilly, Arjun. "OFDM for Underwater Acoustic Communication". Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/34873.
Texto completoMaster of Science
Horák, Martin. "Implementace OFDM v obvodu FPGA". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2008. http://www.nusl.cz/ntk/nusl-217465.
Texto completoSpalding, Scott A. Jr. "Adaptive OFDM Radar Signal Design". Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1335728143.
Texto completoKováč, Michal. "Modulátor OFDM v obvodu FPGA". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2015. http://www.nusl.cz/ntk/nusl-221112.
Texto completoVALENTIM, B. L. "Equalização para Sistemas OFDM Óptico". Universidade Federal do Espírito Santo, 2010. http://repositorio.ufes.br/handle/10/9594.
Texto completoNa ´ultima d´ecada a t´ecnica OFDM (Orthogonal Frequency Division Multiplex ) tem ganhado cada vez mais espa¸co nas comunica¸coes com e sem fio. A ´area das comunica¸coes ´opticas tamb´em se desenvolveu bastante nos ´ultimos anos. Recentemente iniciou-se a jun¸cao destes dois recursos: a t´ecnica OFDM e o canal ´optico. Dentro deste panorama, este trabalho se propoe a estudar a conjuga¸cao destes dois recursos e propor um sistema ´optico simples, onde a compensa¸cao de dispersao e o alocamento de banda ficam sob a resposabilidade da OFDM aplicando a t´ecnica de equaliza¸cao de canal utilizando tons piloto. A esta t´ecnica ´e dado o nome de OOFDM (Optical OFDM). Neste trabalho foi considerado um sistema ´optico de fibra monomodo padrao com modula¸cao de intensidade e detec¸cao direta (IM-DD - Intensity Modulation - Direct Detection), visando deixar a parte ´optica simples. Na transmissao OFDM foi utilizada a simetria hermitiana, para a transmissao em banda base, mapeamento 16-QAM e a aloca¸cao variada atrav´es do bit loading. Para corrigir a dispersao do canal foi implementada uma estima¸cao e equaliza¸cao de canal atrav´es de tons piloto e interpola¸cao linear. O sistema foi simulado e os resultados mostraram a possibilidade de uma transmissao em 20 km de fibra com taxa de 47 Gbps com BER ≈ 10−5 e EVM ≈ −22 dB. Os resultados possibilitam a atua¸cao desta t´ecnica em redes metropolitanas e como solu¸cao para enlaces de ´ultima milha em altas taxas de bits.
Wunder, Gerhard. "A theoretical framework for the peak to average power control problem in OFDM transmission". [S.l.] : [s.n.], 2004. http://deposit.ddb.de/cgi-bin/dokserv?idn=970360150.
Texto completoLeischner, Stefan. "Kompensation von Impulsstörungen in Multiträgersystemen". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=967531985.
Texto completoKongara, Krishna Prasad. "Advances in the Analysis of Adaptive OFDM Systems". Thesis, University of Canterbury. Electrical and Computer Engineering, 2009. http://hdl.handle.net/10092/3835.
Texto completoZhang, Wei. "On frequency synchronization in OFDM-based systems". [S.l. : s.n.], 2007. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-58922.
Texto completoDiao, Zhifeng. "Adaptive packet scheduling in OFDM systems". Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B32059541.
Texto completoLarsson, Oskar y Jimmy Karlsson. "SDR radar demonstrator using OFDM-modulation". Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-21094.
Texto completoToday radars are used to measure the distance to almost anything. It is used to determine the position of airplanes as well as the level of an oiltank. To achieve high precision in level gauging radars high quality components are demanded. This makes them expensive.
In this project we evaluate the possibility to use relatively cheap components, used in radio communication, to measure distances with an OFDM-modulated signal. The components are cheap due to large production volumes rather than low performance.
To do this we started with working out the theory needed for length estimation. At our disposal we had the SDR SFF Development Platform from Lyrtech. A simulation model of the platform was built in MatLab. This model was used to verify the theory developed. Finally our algorithms was implemented on the development platform.
Both simulations and real life measurements show that OFDM can be used to measure distances. Even though the hardware used in this project is not dedicated for this application we managed to perform measurements with good accuracy at short range. We believe that with more suitable hardware OFDM-radars will be able to compete with todays high end level gauging radars at all ranges.
Nu för tiden används radar för att mäta avstånd i en rad olika sammanhang. Det används till allt från att bestämma positionen på flygplan till att mäta nivån i oljetankar. För att uppnå den höga precision som krävs vid nivåmätning ställs höga krav på de ingående komponenterna. Detta gör att radarn blir dyr.
I detta examensarbete utvärderar vi möjligheten att använda relativt billiga komponenter, som används inom radiokommunikation, för att mäta avstånd med hjälp av en OFDM-modulerad signal. Dessa komponenter är billiga till följd av stora tillverkningsvolymer, inte för att de är dåliga.
Till att börja med tog vi fram den teori som behövdes för att skatta avstånd. Till vårt förfogande hade vi Lyrtechs SDR SFF Developmemt Platform. En simuleringsmodell av platformen gjordes i MatLab vilken användes för att verifiera teorin. Slutligen implementerades algoritmerna på utvecklingsplattformen.
Både simuleringar och riktiga mätningar visar att OFDM kan användas för att mäta avstånd. Trots att hårdvaran som användts under examensarbetet inte är anpassad för avståndsmätning blev mätresultaten goda för korta avstånd. Vi är övertygade om att med en, för ändamålet, mer anpassad hårdvara kommer en OFDM-radar upppnå samma precision som dagens högpresterande nivåmätareäven för längre avstånd.
Malkireddy, Sivakesava Reddy. "Spectrum Sensing of acoustic OFDM signals". Thesis, Linköpings universitet, Kommunikationssystem, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-86811.
Texto completoNguyen, Xuan Huan Electrical Engineering & Telecommunications Faculty of Engineering UNSW. "OFDM receiver design with iterative techniques". Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/26776.
Texto completoThanabalasingham, Thayaparan. "Resource allocation in OFDM cellular networks /". Connect to thesis, 2006. http://eprints.unimelb.edu.au/archive/00003227.
Texto completoPan, Xinyue. "Symbol synchronization in OFDM-based systems". Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39793850.
Texto completoChen, Harry Zhi Bing. "Signal design for MIMO-OFDM systems". Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23907.
Texto completoPiskonova, Galyna. "Transmission OFDM pour la téléphonie cellulaire". Mémoire, École de technologie supérieure, 2003. http://espace.etsmtl.ca/783/1/PISKONOVA_Galyna.pdf.
Texto completoWeiß, Timo [Verfasser]. "OFDM-basiertes spectrum pooling / Timo Weiß". Karlsruhe : Inst. für Nachrichtentechnik, 2004. http://d-nb.info/1001463730/34.
Texto completoChowdhury, Moyamer y Aminul Alam. "Study Comparison of WCDMA and OFDM". Thesis, Blekinge Tekniska Högskola, Avdelningen för telekommunikationssystem, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1363.
Texto completoDiao, Zhifeng y 刁志峰. "Adaptive packet scheduling in OFDM systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B32059541.
Texto completoChen, Jianwu y 陳建武. "Frequency synchronization in OFDM-based systems". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2008. http://hub.hku.hk/bib/B40687338.
Texto completo