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Joint convolutional and orthogonal decoding of interleaved-data frames for IS-95 CDMA communicationsRabinowitz, David 29 February 1996 (has links)
IS-95, an interim standard proposed for future digital personal communications
systems, uses two levels of encoding of digital data for error control and compatibility
with code-division multiple access (CDMA) transmission. The data is first
convolutionally encoded and the resulting symbols are interleaved and then groups are
encoded as orthogonal Walsh sequences. Decoding these two separate encodings is
traditionally done in separate sequential steps. By combining the decoding and applying
feedback of the final decision of the second level of decoding to the first level decoder
it is possible to reduce the error rate of the decoder.
Each Walsh sequence encodes six non-adjacent symbols of the convolutional code.
The receiver computes an estimate of the probability that each of the sixty-four possible
Walsh sequences has been sent, and uses this estimate as an estimate for each of the
convolution symbols which specified the Walsh sequence. Since the convolution symbols
are non-adjacent, it is likely that the actual value of some of the earlier symbols will have
been determined by the final decoder before later symbols specifying the same Walsh
sequence are used by the convolution decoder. The knowledge of the values of these
symbols can be used to adjust the probability estimates for that Walsh sequence,
improving the likelihood that future convolutional symbols will be correctly decoded.
Specific metrics for estimating probabilities that each convolutional symbol was
sent were tested with and without the proposed feedback, and error rates were estimated
based on extensive computer simulations. It was found that applying feedback does
improve error rates. Analytical methods were also applied to help explain the effects. / Graduation date: 1996
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Jini an investigation in distributed computing /Olson, Chandra, January 2001 (has links) (PDF)
Thesis (M.E.)--University of Florida, 2001. / Title from first page of PDF file. Document formatted into pages; contains viii, 71 p.; also contains graphics. Vita. Includes bibliographical references (p. 69-70).
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Energy-efficient computation and communication scheduling for cluster-based in-network processing in large-scale wireless sensor networksTian, Yuan. January 2006 (has links)
Thesis (Ph. D.)--Ohio State University, 2006. / Title from first page of PDF file. Includes bibliographical references (p. 148-154).
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Study of advanced techniques in high speed wireless transmissionsHuang, Yuanliang. January 2006 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2006. / Title proper from title frame. Also available in printed format.
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Design and implementation of the precision personnel locator digital transmitter systemDaempfling, Hauke C. January 2006 (has links)
Thesis (M.S.)--Worcester Polytechnic Institute. / Keywords: precision personnel locator; digital systems; embedded systems; waveform generation; data communication. Includes bibliographical references (leaves 108-110).
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An investigation of the impact of routing protocols on MANETs using simulation modelling a dissertation submitted to Auckland University of Technology in partial fufilment of the requirements for the degree of Master of Computer and Information Sciences, 2008 /Lol, Wilford Gibson. January 2008 (has links)
Thesis (MCIS - Computer and Information Sciences) -- AUT University, 2008. / Includes bibliographical references. Also held in print ( xi, 105 leaves : ill. ; 30 cm.) in the Archive at the City Campus (T 621.382 LOL)
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MIMO beamforming in multiuser wireless environmentsKang, Deokwon. January 2009 (has links)
Thesis (M.S.E.C.E.)--University of Delaware, 2009. / Principal faculty advisor: Leonard J. Cimini, Jr., Dept. of Electrical & Computer Engineering. Includes bibliographical references.
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Downlink beamforming for mobile communicationsArredondo, Alberto. January 2001 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.
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Compensation of nonlinear distortion and frequency offset in OFDM systemsChang, Sekchin, January 1900 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2001. / Vita. Includes bibliographical references. Available also from UMI/Dissertation Abstracts International.
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Substrate-guided wave true-time delay network for phased array antenna steering /Fu, Zhenhai, January 2000 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 2000. / Vita. Includes bibliographical references (leaves 164-178). Available also in a digital version from Dissertation Abstracts.
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