| Popis: |
The performance of ultra wideband (UWB) signals in wireless communication systems depends, primarily, on the knowledge of the propagation channel, interfering signals and the proximity between transmit and receive antennas. This work focuses on the study of the UWB propagation channel and, in particular, on how large scale statistics of the frequency components are affected by the environment. A two-ray UWB model is used to show the effects of magnitude, delay, and phase variations on the power spectrum density of UWB signals. Also, spatial uncertainty in measurements is analysed in two ways. Firstly, by deriving mathematical expressions for the area and volume of uncertainty and, secondly, by measuring the effects of displacements between transmit and receive antennas, when the distance changes are smaller than the spatial resolution of the measuring equipment. |
