| Popis: |
After some basic definitions regarding the ultrawideband radio channel, this paper illustrates the characteristic effects of varying the bandwidth on the channel impulse response ranging from narrowband to ultra-wideband. A coherent description of antenna transfer functions that are suited as building blocks for ultra-wideband channel models is reviewed and a coherent equivalent to Friis' formula based thereon is given. Furthermore, the particular shape of the multipath envelope found in some ultra-wideband channels, which is different from a simple exponential decay, is discussed using the example of measured data. |
