Trellis Code
Mostrando 1-6 de 6 artigos, teses e dissertações.
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1. Contributions to the search methods of optimum trellis codes on new lattices partitioning / Contribuições aos metodos de procura dos codigos de treliça otimos sobre novas partições de reticulados
This thesis presents some contributions to the coded modulation schemes for the trellis codes based on lattices partitioning. One of the main contributions is the construction of the trellis codes based on novel lattices partitioning and also on chains partitioning. In order to optimize the search for the optimum trellis codes, a search algorithm was propose
Publicado em: 2008
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2. CodificaÃÃo iterativa para o canal adtivo com dois usuÃrios binÃrios
This thesis is concerned with an investigation of iterative coding schemes for the two-user binary adder channel (2-BAC). A coding scheme is introduced for the 2-BAC using a single convolutional code which permits efficient decoding. The constructed two-user trellis codes have a significant practical advantage because iterative decoding techniques used in th
Publicado em: 2005
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3. Codigos treliça baseados em partições de reticulados : propriedades estruturais e determinação de codigos otimos
Inserted in the mathematical theory of the error correcting codes and, in particular, for coded modulation schemes using trellis codes based on lattices partitions, this thesis introduces the new concepts of special subsets and the norm-matrix GN, with the objective of proposing an efficient algorithm for the exhaustive search, and determination, of new opti
Publicado em: 1999
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4. IMAGE COMPRESSION USING WAVELET TRANSFORM AND TRELLIS CODE VECTOR QUANTIZATION WITH ENTROPY CONSTRAINT / COMPRESSÃO DE IMAGENS USANDO TRANSFORMADA WAVELET E QUANTIZAÇÃO VETORIAL CODIFICADA EM TRELIÇA COM RESTRIÇÃO DE ENTROPIA
This dissertation presentes a low bit rate image coder using a 10 sub-band image decomposition base don the wavelet transform. Some blocks of coefficients of the high frequency sub-bands are discarded by a technique of irrelevancy reduction. The remaning blocks are classified into edges and non-edges, and coded by ECTCVQ (Entropy- constrained Trellis Vector
Publicado em: 1998
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5. Modulação - codificada generalizada via equação de diofanto
The study of trellis code modulation schemes was limited until now to the binary case and to some sporadic ternary and quaternary cases. 1n this work a complete generalization of this theory is achieved for any number of elements of a field, for constellations with one and two dimensions: PAM and QAM. Optimum codes are determined and their corresponding perf
Publicado em: 1990
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6. SIMULATION TRELLIS CODES WITH MULTI-DIMENSIONAL MODULATION FOR THE TELEPHONE CHANNEL / SIMULAÇÃO DE CÓDIGOS EM TRELIÇA COM MODULAÇÕES MULTI-DIMENSIONAIS PARA CANAL TELEFÔNICO
O presente trabalho analisa, através de simulação, o desempenho de códigos em treliça em canais telefônicos. Os esquemas simulados correspondem a modulação com constelação multi-dimensionais codificadas, otimizadas de forma integrada utilizando a regra de mapeamento por particionamento de conjuntos. Uma técnica iterativa, eficiente, para obtençã
Publicado em: 1989