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dc.contributor.advisorKwon, Hyuck M.en_US
dc.contributor.authorMathur, Avinash
dc.date.accessioned2008-09-29T18:47:13Z
dc.date.available2008-09-29T18:47:13Z
dc.date.copyright2007en
dc.date.issued2007-07
dc.identifier.othert07075
dc.identifier.urihttp://hdl.handle.net/10057/1547
dc.descriptionThesis (M.S.)--Wichita State University, College of Engineering, Dept. of Electrical and Computer Engineeringen
dc.description"July 2007."en
dc.description.abstractThis thesis proposed a scheme of obtaining an estimate of channel coefficient and noise power spectral density (PSD), using iterative expectation-maximization (EM) channel estimation, based on a low-density parity-check (LDPC) code-division multiple-access receiver. At the receiver, an initial estimate was obtained with the aid of pilot symbols. Pilot bits were distributed among subframes followed by spreading and binary phase-shift keying. Subsequent values of channel coefficient and noise PSD both were updated iteratively by the soft feedback from the LDPC decoder. The updated channel coefficient and noise PSD were iteratively passed to the LDPC decoder, which resulted in improved decoding accuracy. The algorithm was tested on both a single user for constant noise PSD and a more realistic multiuser environment for a time-varying interference-plus-noise PSD estimation.en
dc.format.extentx, 74 leaves, ill.en
dc.format.extent498120 bytes
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen
dc.publisherWichita State Universityen
dc.subject.lcshElectronic dissertationsen
dc.titleIterative LDPC CDMA receiver with EM estimationen
dc.typeThesisen


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