Thesis (Ph. D.)--University of Washington, 2006. / Vita. Includes bibliographical references (leaves 99-103).

Thesis (M.Eng.)--Memorial University of Newfoundland, 2004. / Bibliography: leaves 94-96.

Thesis (M.S.)--West Virginia University, 2006. / Title from document title page. Document formatted into pages; contains x, 78 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 71-73).

Thesis (Ph.D.)--University of Nebraska-Lincoln, 2006. / Title from title screen (sites viewed on August 10, 2006). PDF text of dissertation: 86 p. ; 0.41Mb. UMI publication number: AAT 3208054. Includes bibliographical references. Also available in microfilm, microfiche and paper format.

Thesis (M.S.)--Ohio University, November, 2004. / Title from PDF t.p. Includes bibliographical references (p. 54-56)

Thesis (M.S.)--Oregon State University, 2008. / Printout. Includes bibliographical references (leaves 53-56). Also available on the World Wide Web.

Thesis (M.E.)--University of Canterbury, 2007. / Typescript (photocopy). "March 2007." Includes bibliographical references (p. [113]-117). Also available via the World Wide Web.

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Orientador: Renato Baldini Filho / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Eletrica e de Computação / Made available in DSpace on 2018-08-15T15:42:05Z (GMT). No. of bitstreams: 1 Viti_RenataMataveli_M.pdf: 617502 bytes, checksum: d98652710603eab7bf502095a2620770 (MD5) Previous issue date: 2010 / Resumo: Este trabalho avalia o desempenho do código turbo quaternário, com matriz geradora G = [7, 5] para os códigos convolucionais constituintes e entrelaçamento do tipo s-aleatório, em um sistema de transmissão OFDM. Este desempenho é medido em termos de taxa de erro de bit em função da relação energia de bit por densidade espectral de potência unilateral do ruído. Os resultados obtidos são analisados de forma comparativa com referência no padrão do Sistema Brasileiro de Televisão Digital (SBTVD). Os canais utilizados na simulação computacional foram com AWGN (ruído gaussiano branco aditivo), desvanecimento plano e seletivo em frequência. A codificação turbo quaternária associada ao OFDM mostrou ser uma boa alternativa de codificação interna para o padrão TV digital brasileira / Abstract: This study evaluates the performance of quaternary turbo codes, with generator matrix G = [7, 5] for the constituent convolutional codes and s-random interleaving , in an OFDM transmission system. This performance is measured in terms of bit error rate versus energy per bit to unilateral noise power spectral density ratio. The results obtained are analyzed comparatively to the Brazilian Digital Television System Standard (SBTVD). The channels used in the computer simulation are AWGN (Additive White Gaussian Noise), flat and frequency selective fading. Quaternary turbo coding associated with OFDM has shown to be a good alternative to inner encoding for the Brazilian digital TV standard / Mestrado / Telecomunicações e Telemática / Mestre em Engenharia Elétrica

D.Ing. / In this thesis we combined two techniques, namely a spectral shaping technique and a distance-preserving mapping technique to design new codes with both special spectrum shaping and error correction capabilities, in order to overcome certain communication problems like those that occur in a power-line communication channel. A new distance-preserving mapping construction based on graph theory is firstly presented. The k-cube graph construction from binary sequences to permutation sequences reached the upper bound on the sum of the Hamming distances for certain lengths of the permutation sequences and achieves the same sum of the Hamming distances as the best previously published constructions for most of the rest of the lengths. The k-cube graph construction is considered to be a simple and easy construction to understand the concept of mappings and especially the concept of a distance-reducing mapping.