1.6. Challenges
UWB technology for communications is not all about advantages. In fact, there are many challenges involved in using nanosecond-duration pulses for communications. Some of the main difficulties of UWB communications are discussed in the following subsections.
1.6.1. Pulse-Shape Distortion
The transmission characteristics of UWB pulses are more complicated than those of continuous narrowband sinusoids. A narrowband signal remains sinusoidal throughout the transmission channel. However, the weak and low-powered UWB pulses can be distorted significantly by the transmission link. We can show this distortion mathematically with the widely used Friis transmission formula:
Equation 1-7
where Pr and Pt are the received and transmitted ...
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