Linear Block Codes
Mostrando 1-5 de 5 artigos, teses e dissertações.
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1. Arithmetic fuchsian groups and space time block codes
In the context of space time block codes (STBCs) the theory of arithmetic Fuchsian groups is presented. Additionally, in this work we present a new class of STBCs based on arithmetic Fuchsian groups. This new class of codes satisfies the property full-diversity, linear dispersion and full-rate. Mathematical subject classification: 18B35, 94A15, 20H10.
Computational & Applied Mathematics. Publicado em: 2011
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2. Algoritmos de autenticação de mensagens para redes de sensores. / Message authentication algorithms for wireless sensor networks.
Security is an important concern in any modern network. However, networks that are highly dependent on constrained devices (such as sensors, tokens and smart cards) impose a difficult challenge: their reduced availability of memory, processing power and (specially) energy hinders the deployment of many modern cryptographic algorithms known to be secure. This
Publicado em: 2010
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3. Construction of linear block codes via digital transforms / ConstruÃÃo de cÃdigos de bloco lineares via transformadas digitais
Novas famÃlias de cÃdigos corretores de erros, criados a partir da transformada numÃrica de Fourier (CÃdigos de Fourier) e de transformadas trigonomÃtricas sobre corpos finitos (CÃdigos FFCT tipo 4 par, do inglÃs finite field cosine transform, e CÃdigos FFST tipo 4 par, do inglÃs finite field sine transform), sÃo apresentadas nesta dissertaÃÃo. A
Publicado em: 2009
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4. Is there an error correcting code in the base sequence in DNA?
Modern methods of encoding information into digital form include error check digits that are functions of the other information digits. When digital information is transmitted, the values of the error check digits can be computed from the information digits to determine whether the information has been received accurately. These error correcting codes make i
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5. Characterization of genes in the cellulose-synthesizing operon (acs operon) of Acetobacter xylinum: implications for cellulose crystallization.
The synthesis of an extracellular ribbon of cellulose in the bacterium Acetobacter xylinum takes place from linearly arranged, membrane-localized, cellulose-synthesizing and extrusion complexes that direct the coupled steps of polymerization and crystallization. To identify the different components involved in this process, we isolated an Acetobacter cellulo