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Doctoral Thesis
DOI
Document
Author
Full name
Bruno Augusto Angélico
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Jeszensky, Paul Jean Etienne (President)
Casella, Ivan Roberto Santana
Nascimento, Vítor Heloiz
Panazio, Cristiano Magalhães
Portugheis, Jaime
Title in Portuguese
Sistemas de banda ultralarga com pré-processamento.
Keywords in Portuguese
Filtros elétricos adaptativos
Processamento digital de sinais
Telecomunicações
Abstract in Portuguese
A resposta impulsiva do canal de um sistema de banda ultralarga típico é caracterizada pelo elevado número de percursos discerníveis. Dessa forma, para uma recepção eficiente, a energia espalhada nessas componentes multipercurso deve ser de alguma forma combinada. Considerando o enlace direto (downlink) de uma rede pessoal de curto alcance, assume-se que o ponto de acesso possui uma capacidade de processamento maior do que os dispositivos portáteis a ele conectados, tais como câmeras fotográficas, celulares e aparelhos de MP3. Este trabalho se concentra no estudo de esquemas de pré-processamento em ambientes mono e multiusuário, com vistas a combinar eficientemente a energia espalhada nas componentes multipercurso do canal e, consequentemente, combater a autointerferência e a interferência entre usuários, sem agregar muito custo computacional ao receptor (dispositivos portáteis da rede). Com isso, boa parte da complexidade é transferida para o transmissor (ponto de acesso), de forma que o receptor necessite apenas de um detector convencional, ou então de um detector convencional seguido de processamento adicional de complexidade moderada para mitigar a interferência residual.
Title in English
Ultra-high band systems with pre-processing.
Keywords in English
Digital signal processing
Electrical adaptive filters
Telecommunications
Abstract in English
The channel impulse response of a typical ultra wideband system is characterized by a large number of resolvable paths. For a efficient reception, the energy spread over the multipath components has to be somehow combined. Considering the downlink of a wireless personal area network, the access point is assumed to have a good hardware capacity when compared to the portable devices of the network, such as digital cameras, cell phones and MP3 players. This work focuses on preprocessing schemes that are able to combine efficiently the multipath components, and to combat self and multiuser interference without increasing the computational cost at the receiver (portable devices) substantially. Hence, most of the complexity is transferred to the transmitter (access point) in such a way that the receiver needs only a conventional detector or a conventional detector followed by a moderated complexity processing in order to mitigate the residual interference.
 
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Publishing Date
2010-08-30
 
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