Allan B. Costa

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— Representing the signal power at a studied environment through a mathematical model is one major challenge of signal propagation study. In this work is proposed an empirical Autoregressive Moving-Average (ARMA) model for signal strength prediction in indoor environments. A Genetic Algorithm (GA) was employed to calibrate the model (finding coefficients),(More)
— The current suite of wireless OPNET does not have an adequate propagation model that features a densely arboreus environment. Thus this paper proposes the implementation of a new model of propagation to environments like Amazon Forest in the range of 5.8 GHz using network simulation in OPNET.
—This work analyses the feasibility of use Femtocells networks to provide return channel on Digital TV. The results were compared with a similar simulation using Wimax networks. The same numbers of users was used to create two scenarios, the first using only WiMAX networks, and the second using femtocell network. The results show that femtocell networking(More)
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