Browsing by Issue Date, starting with "2010-09"
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- Unified propagation model for Wi-Fi, UMTS and WiMAX planning in mixed scenariosPublication . Varela, Frederico; Sebastião, Pedro; Correia, Americo; Cercas, Francisco; Rodrigues, António; Velez, Fernando J.; Robalo, DanielThis paper presents an unified and empirical propagation model to obtain the received power in mixed scenarios, with outdoor and indoor environments, or in a scenario with only one kind of environment, either for an urban, sub-urban or rural scenario, with or without vegetation. This unified model is called the Lisbon University Institute (LUI) one and can be included into planning tools for wireless communication systems. The developed model is suitable for Path Loss prediction in mobile, as well as fixed wireless network systems, e.g., Wireless Fidelity, Universal Mobile Telecommunications System and Worldwide Interoperability for Microwave Access, considering Line-of-Sight or Non-Line-of-Sight propagation conditions.
- Validation of the unified propagation model for Wi-Fi, UMTS and WiMAX planningPublication . Varela, Frederico; Sebastião, Pedro; Correia, Americo; Cercas, Francisco; Rodrigues, Antonio; Velez, Fernando J.; Robalo, DanielThis paper presents the validation of the unified propagation model, the Lisbon University Institute (LUI) model, which is valid for three wireless technologies: Wireless Fidelity, Universal Mobile Telecommunications System and Worldwide Interoperability for Microwave Access. With this purpose in mind, several experimental trials for those technologies were performed in different scenarios, where mixed environments (outdoor and indoor) were included. This generalized and unified propagation model was tuned by adjusting specific parameters for each different technology, based on the achieved results from the field experiments.
- Comunicação sem palavrasPublication . Magalhães, Carla Sofia Cerqueira; Nascimento, André BarataPara lá da generalidade da pergunta «Tudo é comunicação?», que sentido pode fazer perguntarmo-nos «O que comunica no ser humano?», ou mesmo questionarmo-nos sobre a hipótese «E se tudo no ser humano comunica?». Eis a problemática inerente à investigação que aqui se tenta levar a cabo. Obviamente, em tudo existe a possibilidade, por mais diminuta que seja, de haver um momento comunicativo. Mais do que fundamentar essa possibilidade, é propósito deste estudo salientar que a comunicação humana desenvolve por si mesma um “sistema” comunicativo que faz do corpo, do rosto e de todas as expressões envolventes veículos de transmissão expressiva de informação, e também fonte de conhecimento para receptores em interacção com o interlocutor.