Turbo equalization using message passing methods with higher order modulation signaling

dc.contributor.advisorKelley, Brian
dc.contributor.authorHan, Youngjong
dc.contributor.committeeMemberAkopian, David
dc.contributor.committeeMemberAgaian, Sos
dc.date.accessioned2024-02-09T21:56:18Z
dc.date.available2024-02-09T21:56:18Z
dc.date.issued2009
dc.descriptionThis item is available only to currently enrolled UTSA students, faculty or staff. To download, navigate to Log In in the top right-hand corner of this screen, then select Log in with my UTSA ID.
dc.description.abstractModern digital communication systems employ some form of error-control code (ECC) to improve the system performance over intersymbol interference (ISI) channel. Since the discovery of turbo codes, iterative decoding has become a vital field of research in digital communications. The turbo equalization is a widely used iterative receiver technique which has high performance of bit error rate (BER). Many turbo equalization techniques have been proposed different BER performances and different computational complexities. The most well-known technique is the maximum a posteriori probability (MAP)-based turbo equalization algorithm which consists of MAP equalizer and MAP decoder. However, this algorithm gives rise to an impractical computational complexity. The computational burden leads us to consider the turbo equalization based on minimum mean squared error (MMSE) linear equalizer which reduces the computational complexity extremely and improves the BER performance as much as the MAP-based turbo equalization. In this thesis we will employ the SISO algorithm based on linear MMSE filter for the equalizer and use the SISO algorithm based on MAP/BCJR for the decoder in order for the massage passing in the turbo equalization. The objective of this thesis is to study the proposed turbo equalization algorithm and to apply this algorithm to 16-QAM for the practical implementation. Finally, we present simulation results to compare the performances of the turbo equalization with different modulation schemes.
dc.description.departmentElectrical and Computer Engineering
dc.format.extent86 pages
dc.format.mimetypeapplication/pdf
dc.identifier.urihttps://hdl.handle.net/20.500.12588/3709
dc.languageen
dc.subjectMAP decoder
dc.subjectMMSE equalizer
dc.subjectTurbo Equalization
dc.subject.classificationElectrical engineering
dc.titleTurbo equalization using message passing methods with higher order modulation signaling
dc.typeThesis
dc.type.dcmiText
dcterms.accessRightspq_closed
thesis.degree.departmentElectrical and Computer Engineering
thesis.degree.grantorUniversity of Texas at San Antonio
thesis.degree.levelMasters
thesis.degree.nameMaster of Science

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