Rafael F. S. Caldeirinha

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Modelling radio wave propagation through vegetation is becoming increasingly more important. Many emperical solutions have been suggested in the past. The theory of radiative energy transfer offers an analytical method to the problem. This theory requires however 4 imput paramters, which need to be established experimentally. A measurement of the angular(More)
This paper presents a swept time delayed cross-correlation (STDCC) channel sounder. The proposed topology employs the real-time sliding correlation technique of pseudo-random (PN) sequences, enabling amplitude and Doppler spectrum measurements and analysis of individual multipath components. It makes use of recent technologies, specifically in the(More)
This paper proposes a framework for extending the applicability of the discrete RET (dRET) model to accommodate radiowave scattering from tree trunks, particularly in microcell urban mobile scenarios, at microand millimetre wave frequencies. This framework aims to provide accurate modelling of the signal emanated inside and around isolated blocks of tree(More)
An analytical model based on the theory of the Radiative Energy Transfer (RET) is used to predict the bistatic scattering pattern of single trees. A set of propagation measurements were designed and carried out at microand millimeter wave frequencies to characterise the re-radiation functions of single trees modelled by simpler scattering functions, which(More)
An important part of the modelling process applied to vegetation effects is aimed at analysing the radio propagation modes and the identification of individual signal contributions to the scattered signal caused by various elements of the tree. The paper describes detailed studies aimed at the wideband characterisation of propagation mechanisms arising in(More)
The work presented in this paper aims to continue the progress obtained in the development of a ray tracing based simulation platform for realistic doubly selective radio channels. This framework is the integration of various propagation models present in literature, with a novel method to characterise the obstacles present in the radio path, relying only(More)