Abstract
This paper presents an efficient application of the Time-Domain Uniform Theory of Diffraction (TD-UTD) for the analysis of Ultra-Wideband (UWB) mobile communications for indoor environments. The classical TD-UTD formulation is modified to include the contribution of lossy materials and multiple-ray interactions with the environment. The electromagnetic analysis is combined with a ray-tracing acceleration technique to treat realistic and complex environments. The validity of this method is tested with measurements performed inside the Polytechnic building of the University of Alcala and shows good performance of the model for the analysis of UWB propagation.
Highlights
Ultra-wideband (UWB) technology has developed rapidly in the past several years. This technology is especially attractive in high data rate and short-range wireless communications
The deterministic models are mostly based on the ray-tracing techniques [5,6,7] to predict the multipath phenomena, and the Uniform Theory of Diffraction (UTD) technique [9] to calculate the received power or the propagation losses
High-speed method based on Time-Domain Uniform Theory of Diffraction (TD-UTD) to analyze indoor propagation for UWB systems has been presented
Summary
Ultra-wideband (UWB) technology has developed rapidly in the past several years. This technology is especially attractive in high data rate and short-range wireless communications. The frequency domain UTD can be applied, performing an analysis at several frequencies and obtaining the time response using an Inverse Fourier Transform. The method proposed in this work improves on these previous approaches by generalizing the TD-UTD formulation for the analysis of realistic environments This aim is achieved by including the multiple-ray contributions. With the aim of further reducing this computation time, the convolution of the analytical impulse response with the excitation is performed in an efficient way by expressing the excitation waveform as a sum of simple expansion functions allowing the convolution to be performed in closed form Taking these into account, the analysis of a real site has been performed to prove the validity of the model and its ability to analyze realistic environments. The analysis of such a complex site was made possible due to the improvements included in our approach
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