Encontrados 6 documentos, a visualizar página 1 de 1
Infrared Wireless Local Area Networks
Rui Jorge Morais Tomaz Valadas; A. Manuel de Oliveira Duarte; José Manuel Rego Lourenço BrázioThis thesis studies infrared wireless local area networks, considering simultuneously the physical link and medium access aspects. A general description of free-space infrared physical links is carried out, with the main purpose of characterising and comparing quasi-diffuse and diffuse cells (in quasi-diffuse cells the optical connection between stations is through a single reflector while in the diffuse cells ...
Optical Wireless Transmission Systems for Indoor Environments
Adriano Jorge Cardoso Moreira; A. Manuel de Oliveira Duarte; Rui Jorge Morais Tomaz ValadasThis thesis studies the performance of wireless in-house transmission systems using infrared optical signals. These studies focus in the physical layer of the transmission systems. (...)keywords: infrared; wireless communications;modulation; PPM; ambient noise; artificial light interference; frame format; IEEE 802.11Ph.D., 1998more info. http://opac.ua.pt/F/?func=find-b&find_code=SYS&REQUEST=0...
Wireless Indoor Infrared Communications: Modelling, Simulation and Optimisation...
Cipriano Rogério Alves Tavares Lomba; A. Manuel de Oliveira Duarte; Rui Jorge Morais Tomaz ValadasThis thesis studies the propagation of optical signals in indoor environments, aiming the development of high speed and high performance wireless infrared communication systems. Special attention is given to aspects of modelling, simulation and optimisation of the optical channel. An overview o f wireless indoor optical communication systems is presented. (...)keywords: infrared; wireless infrared communic...
Wireless Local Area Networks: Study and Development of the IEEE 802.11 MAC Sub-...
Paula Cristina da Silva Couto; A. Manuel de Oliveira Duarte; Rui Jorge Morais Tomaz ValadasThe work presented was developed in the scientific domain of wireless local area networks. This dissertation describes the specification, implementation and test of the MAC sublayer for wireless local area nefworks, as defined by the IEEE 802.11 specification. (...)Keywords: wireless local area networks; MAC sublayer; IEEE 802.11; medium access; CSMA/CA; synchronism management; power management; SDI; state...
Topological Project of Communication Networks: Study and Implementation of Algo...
Celso Ribeiro Braguês de Lemos; Rui Jorge Morais Tomaz ValadasThe evolution of the network together with the associated technologies brings the need to create proper network planning techniques in order to ensure an efficient use of the available resources. In spite of this some network topology optimization software tools are currently under development. (...)Keywords: network topologies; network algorithmsM.S., 1997more info. http://opac.ua.pt/F/?func=find-b&a...
ATM Virtual Private Networks
Jorge Manuel dos Santos Correia Carapinha; Rui Jorge Morais Tomaz ValadasThe success of new telecommunications technologies, mainly in public networks, is often hindered by the lack of an application which can stimulate its demand by the customers. (...)Keywords: ATM; private networks; resource management; signaling; virtual paths; multicast; network evolutionM.S., 1998more info. http://opac.ua.pt/F/?func=find-b&find_code=SYS&REQUEST=000117041 ; Um dos probl...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||