Detalhes bibliográficos
| Ano de defesa: |
2004 |
| Autor(a) principal: |
Fonseca, Leandro Coimbra da
 |
| Orientador(a): |
Gomes, Geraldo Gil Ramundo
|
| Banca de defesa: |
Gomes, Geraldo Gil Ramundo
,
Baldini Filho, Renato
,
Silveira, Adonias Adonias Costa da
|
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
por |
| Instituição de defesa: |
Instituto Nacional de Telecomunica??es
|
| Programa de Pós-Graduação: |
Mestrado em Engenharia de Telecomunica??es
|
| Departamento: |
Instituto Nacional de Telecomunica??es
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://tede.inatel.br:8080/tede/handle/tede/73
|
Resumo: |
Abstract: One of the main factors that cause degradation of the quality of digital systems long range in line of sight with transmission rates on the order of a few tens of Mb / s, are the selective fading in frequency. An alternative to reduce the effect caused by selective fading in frequency is coded using a multicarrier modulation of [6], [17]. This work aims to analyze the performance of a coded multicarrier modulation by low blocks complexity for M-QAM constellations (M-ary Quadrature Amplitude Modulation) best suited to non-square pipes with widths close to 29MHz bands. At the end of this study with the results obtained from computer simulations for BCMCM scheme (Block Coded Multicarrier Modulation) 128-QAM, using a simple code arrangement is compared with the BCMCM scheme 64-QAM presented in [6], [ 17], when observed, as well as reducing bandwidth used, a reduction of the system signature area. It was also analyzed the performance of a BCMCM 32-QAM system for a transmission rate of 51MB / s. |
