Estimação de sinais caóticos com aplicação em sistemas de comunicação
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Tipo
Dissertação
Data de publicação
2011-02-01
Periódico
Citações (Scopus)
Autores
Amaral, Marcos Almeida do
Orientador
Lopes, Paulo Batista
Título da Revista
ISSN da Revista
Título de Volume
Membros da banca
Matos, Christiano José Santiago de
Romano, João Marcos Travassos
Romano, João Marcos Travassos
Programa
Engenharia Elétrica
Resumo
Communications have achieved great development on several fronts over the years. Among these, the communication using chaotic signals has been object of growing interest among researchers due to the characteristics of spread spectrum and hard detection. However these techniques still have inferior performance in comparison to conventional methods in non-ideal channels. To contribute do the solution of this problem, statistical estimation algorithms have been applied to the detection of the transmitted signal. The objective of this thesis is to study a communication system using chaotic carriers and reception with maximum likelihood (ML-CSK - Maximum Likelihood Chaos Shift Keying). For this, the application of Viterbi algorithm in chaotic modulation signals is investigated. As the previously proposed algorithms offer only good performance to signals generated by maps that present well-behaved probability density, a new technique was designed based on analysis of the map characteristics, obtained numerically through a training vector. The results of performed simulations assure the applicability and the good performance of the proposed innovations.
Descrição
Palavras-chave
modulação caótica , estimação , máxima verossimilhança , algoritmo de Viterbi , sistemas dinâmicos , chaotic modulation, estimation, maximum likelihood, Viterbi algorithm, dynamic systems