Uma t?cnica para redu??o de interfer?ncia de m?ltiplo acesso em sistemas MC-CDMA

• Ano de defesa: 2007
• Autor(a) principal: Nunes, Daniel Andrade
• Orientador(a): Guimar?es, Dayan Adionel
• Banca de defesa: Guimar?es, Dayan Adionel , Jeszensky, Paul Jean Etienne , Fasolo, Sandro Adriano
• 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: Comunica??o M?vel; CDMA - division multiple access; MC-CDMA - multi carrier code division multiple access;
• Área do conhecimento CNPq: Engenharia - Telecomunica??es
• Link de acesso: http://tede.inatel.br:8080/tede/handle/tede/44

Most of the techniques for Multiple Access Interference (MAI) reduction or cancellation in Code-Division Multiple Access systems are applicable only to the up-link. In this case, the radio-base system knows the signature of all users and can apply a Multi-User Detection (MUD) strategy. A new technique is proposed in this work to reduce the influence of MAI on the down-link of a Multi-Carrier CDMA (MC-CDMA) system, without resorting to MUD. The technique is based on the use of a pair of spreading sequences especially chosen for each user. These sequences must have special characteristics to reduce the MAI effects on fixed and time varying multi-path Rayleigh fading channels. The proposed technique shows better results in terms of bit error rate if compared with the originally described by H. Zare and D. Liu.