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Previous issue date: 2005-12-16 === Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior === The introduction of new digital services in the cellular networks, in transmission rates each time more raised, has stimulated recent research that comes studying ways to increase the data communication capacity and to reduce the delays in forward and reverse links of third generation WCDMA systems. These studies have resulted in new standards, known as 3.5G, published by 3GPP group, for the evolution of the third generation of the cellular systems. In this Masters Thesis the performance of a 3G WCDMA system, with diverse base stations and thousand of users is developed with assists of the planning tool NPSW. Moreover the performance of the 3.5G techniques hybrid automatic retransmission and multi-user detection with interference cancellation, candidates for enhance the WCDMA uplink capacity, is verified by means of computational simulations in Matlab of the increase of the data communication capacity and the reduction of the delays in the retransmission of packages of information === A introdu??o de novos servi?os digitais nas redes celulares, em taxas de transmiss?o cada vez mais elevadas, tem impulsionado recentes pesquisas que v?m estudando maneiras de aumentar a capacidade de transmiss?o de dados e diminuir os atrasos nos enlaces direto e reverso de sistemas de terceira gera??o WCDMA. Esses estudos t?m resultado em novos padr?es, chamados de 3.5G, publicados pelo grupo 3GPP, para a evolu??o da terceira gera??o dos sistemas celulares. Nesta disserta??o de mestrado o desempenho de um sistema de 3G WCDMA, com diversas esta??es base e milhares de usu?rios ? analisado com aux?lio da ferramenta de projetos NPSW. Al?m disso a performance das t?cnicas de 3.5G redu??o do tamanho do quadro de transmiss?o, retransmiss?o autom?tica h?brida e detec??o multi-usu?rio com cancelamento de interfer?ncias, candidatas para amplia??o do uplink de redes WCDMA, ? verificada por meio de simula??es computacionais, na linguagem Matlab, do aumento da capacidade de transmiss?o de dados e da diminui??o dos atrasos na retransmiss?o de pacotes de informa??o. Palavras-Chave: WCDMA, UMTS, capacidade de transmiss?o, t?cnicas de 3.5G EUL, redu??o do quadro de transmiss?o, retransmiss?o autom?tica h?brida, detec??o multi-usu?rio, cancelamento de interfer?ncias
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