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Adaptive, Turbo-coded OFDM

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dc.contributor.authorIlunga, Louen
dc.contributor.committeechairAnnamalai, Annamalai Jr.en
dc.contributor.committeememberJacobs, Iraen
dc.contributor.committeememberReed, Jeffrey H.en
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2014-03-14T20:43:34Zen
dc.date.adate2005-09-15en
dc.date.available2014-03-14T20:43:34Zen
dc.date.issued2005-06-30en
dc.date.rdate2005-09-15en
dc.date.sdate2005-08-16en
dc.description.abstractWireless technologies, such as satellite, cellular, and wireless internet are now commercially driven by ever more demanding consumers, who are ready for seamless integration of communication networks from the home to the car, and into the office. There is a growing need to quickly transmit information wirelessly and accurately. Engineers have already combine techniques such as orthogonal frequency division multiplexing (OFDM) suitable for high data rate transmission with forward error correction (FEC) methods over wireless channels. 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.en
dc.description.degreeMaster of Scienceen
dc.identifier.otheretd-08162005-101502en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08162005-101502/en
dc.identifier.urihttp://hdl.handle.net/10919/34578en
dc.publisherVirginia Techen
dc.relation.haspartETDF.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectdoppleren
dc.subjectfrequency selective Rayleigh channelen
dc.subjectadaptive modulationen
dc.subjectturbo codesen
dc.subjectorthogonal frequency division multiplexingen
dc.subjecttarget BERen
dc.titleAdaptive, Turbo-coded OFDMen
dc.typeThesisen
thesis.degree.disciplineElectrical and Computer Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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