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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

[en] TIME ALLOCATION OF TDMA CARRIERS / [pt] CONSIGNAÇÃO TEMPORAL DE PORTADORES TDMA

FABIO SILVA LEITE 27 August 2009 (has links)
[pt] Um problema importante em sistemas de comunicações por satélite utilizando múltiplo acesso por divisão no tempo (TDMA) é a consignação de bursts no espaço tempo-freqüência disponível para estabelecer a interconexão entre as estações da rede. Alguns algoritmos tem sido sugeridos para realizar tal consignação de bursts. Este trabalho examina um conjunto de algoritmos que, embora heurísticos, procuram minimizar custos relacionados aos segmentos espaciais e de Terra bem como utilizar eficientemente os transpoders. Os algoritmos propostos são simples e nas situações examinadas apresentaram resultados pelo menos tão bons quanto os daqueles propostos anteriormente na literatura. / [en] An important problem in time division multiple Access (TDMA) sattelite systems is the assignment of bursts in the time-frequency space, available to provide the interconnection among a given pumber of earth stations. Algorithms for burst assignment in such an environment have already been considered in the literature. A set of algorithms are suggested here, which take into account that the resulting assignment should minimize space and earth terminal costs as well as leasd to efficient use of transponder capacities. The proposed algorithms are very simple and led to sebeduling results at least as good as those examined in the literature.

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