Experimental Investigation of the Properties of Multiband UWB Propagation Channels

In this paper, the link budget of the multiband UWB channel is studied based on empirical analysis of path loss and shadow fading by dividing the frequency range into multiple sub- bands with 500 MHz bandwidth. The work is based on ultra- wide band (UWB) propagation measurements performed in two indoor environments of a hall and a corridor in the frequency range of 3-10 GHz. It is found that in the multiband channels, the path loss exponent is independent on frequency, and the mean path loss can be modelled as a function of frequency. Shadowing (in dB) fits well with normal distribution, and the standard deviation (STD) of shadowing shows a tendency of increasing with frequency. Furthermore, the shadow fading margin with 90% link success probability is found to bee fairly low (less than 4 dB) the multiband channels. The presented results can be used for design of UWB radio systems.