Coding Schemes
Mostrando 1-12 de 30 artigos, teses e dissertações.
-
1. A Construction of Rotated Lattices via Totally Real Subfields of the Cyclotomic Field ℚ(ζp)
RESUMO A teoria de reticulados têm mostrado útil na teoria da informação e reticulados ideais com alta diversidade de modulação têm sido extensamente estudados como uma alternativa de transmissão via o canal de Rayleigh, onde o desempenho destes esquemas de modulação depende essencialmente da diversidade de modulação e da distância produto míni
TEMA (São Carlos). Publicado em: 13/12/2019
-
2. Método de Haseman-Elston e suas modificações no estudo de genes controladores de característica quantitativa / Haseman-Elston methodology and modifications on the study genes underlining quantitative trait loci
QTL mapping allows to study loci that play a role in complex traits, as well to determine their chromosomal locations. For this purpose, a set of methods useful for the study of quantitative traits are those based on Haseman-EIston regression, that is quite used in human genetics. These are robustness regression methods for linkage analysis that can be used
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/01/2012
-
3. Cultura acadêmica e tecnologias intelectuais digitais: ensinar e aprender com blogs educativos no ensino superior
Culture as the main organizer of ways of being and living of people has become fundamental, especially after the second half of the twentieth century and the twenty-first century. Since 1960, studies conducted by Cultural Studies, especially by Media Studies, have initiated the problematization of the relationship between culture and media in the constitutio
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/12/2011
-
4. Avaliação de desempenho de esquemas de modulação e codificação na presença de interferência de co-canal / Performance evaluation of modulation and coding schemes in the presence of co-channel interference
Este trabalho avalia os efeitos da interferência de co-canal na taxa de erro de bits (BER) de sistemas de transmissão digitais sem fio. O ambiente do sistema considera canais com ruído gaussiano (AWGN) e canais com desvanecimento Rayleigh na presença de um interferente de co-canal dominante, onde os usuários empregam esquemas de modulação BPSK e M-QAM
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 21/11/2011
-
5. Modulação quantizada para sistemas com codificação wavelet sujeitos ao desvanecimento rayleigh
Wavelet coding is an efficient technique to overcome the multipath fading effects, which are characterized by fluctuations in the intensity of the transmitted signals over wireless channels. Since the wavelet symbols are non-equiprobable, modulation schemes play a significant role in the overall performance of wavelet systems. Thus the development of an effi
Publicado em: 2009
-
6. Reduzindo o consumo de potência em redes intra-chip através de esquemas de codificação de dados. / Reducing the power consumption in networks-on-chip through data coding schemes
O consumo de potência em uma Rede Intra-Chip (em inglês, Network-on-Chip – NoC) cresce linearmente com a quantidade de transições de sinais nos pacotes transmitidos através da infra-estrutura de interconexão. Uma forma de minimizar o consumo de potência em um sistema baseado em NoC é reduzir a atividade de transição de sinais nas portas de entrad
Publicado em: 2008
-
7. 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
-
8. Proposta de política de adaptação de enlace EDGE como caminho de evolução para provimento de serviços IMS de terceira Geração / Proposal for a policy of EDGE link adaptation as way of evolution for provisions of third generation IMS services
With the increasing demand for wireless packet data services, 3G wireless carriers today are faced with the challenge of offering multimedia applications with quality of service requirements while at the same time effectively utilizing precious wireless bandwidth. These new data services require increased bandwidth and data throughput, due to their intrinsic
Publicado em: 2008
-
9. Analise de desempenho de sistemas de TV digital moveis DVB-H e ISDB-T utilizando concatenação de codigos BCH e turbo codificadores / Performance analysis of mobile digital TV systems DVB-H and ISDB-t by the use of BCH and turbo codes concatenation
The aim of this work is to study the performance of channel encoders with iterative decoder: and also different encoders concatenation schemes to mobile digital television standards ;; DVB-H and ISDB-T. The contribution of this work is a proposal of encoder concatenatic scheme for COFDM systems evaluated through software implementation. The final results I t
Publicado em: 2007
-
10. Analysis of optical CDMA systems / Análise de sistemas CDMA ópticos
The evolution of optical networks verified in the last few years has been characterized by the search for better bandwidth utilization efficiency. The successful implementation of practical code division for multiple access techniques (CDMA) in mobile communications systems has stimulated new investigations on this topic, particularly in the optical domain (
Publicado em: 2006
-
11. ESQUEMAS DE MODULAÇÃO PARA DISTRIBUIÇÃO QUÂNTICA DE CHAVES COM CODIFICAÇÃO DE FREQÜÊNCIA / MODULATION SCHEMES FOR FREQUENCY CODED QUANTUM KEY DISTRIBUTION
Quantum cryptography has been proposed as a solution to the cryptographic key distribution problem with absolute security guaranteed by the principles of quantum mechanics. Through this scheme it is possible to find out whether a spy tried to eavesdrop on the transmission, which was impossible to discover using classical transmission techniques. In this work
Publicado em: 2005
-
12. 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