Detalhes bibliográficos
| Ano de defesa: |
2017 |
| Autor(a) principal: |
Silva, Ana Paula Teles Ribeiro da
 |
| Orientador(a): |
Brito, Jos? Marcos Camara
|
| Banca de defesa: |
Brito, Jos? Marcos Camara
,
Souza, Rausley Adriano Amaral de
,
Cardieri, Paulo
|
| 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/153
|
Resumo: |
Due to spectrum scarcity problems in telecommunication networks and the rising de-mand for high transmission rates, several studies are being made in order to increase the network?s performance, so that the quality of service (QoS) can be ensured. A method to improve the network's performance is the usage of adaptive techniques, such as the adap-tive modulation ones, the target of this dissertation. The definition of the optimum switching points between modulations is a key concern in order to use adaptive modulation techniques. In this work, we analyze the influence of the channel model when searching for the optimum switching points in a traditional wire-less communication system, and also for a system which employs the usage of cognitive radios. Three performance criterions were considered: the throughput, the delay, and the power metric. We also analyze the optimum switching points for a system with cognitive radio considering the use of the Slotted Aloha multiple access protocol. |
