Ultra wideband (UWB) communication is based on the transmission of short pulses on the order of nanoseconds. As a result, UWB systems operate over dedicated spectrum bands already occupied by other narrowband systems. Because a UWB device spreads its energy over a large frequency range, it radiates a small percentage of its total power in the operating spectrum of narrowband receivers. Consequently, UWB signals appear as low-power noise and have little impact on underlying operating devices. However, the interference coming from narrowband systems operating in the spectrum allotted for UWB use could be problematic. This thesis contains two main investigations. In the first investigation, we analyze the coexistence of time-hopping pulse amplitude modulation UWB systems in the presence of narrowband interference exploiting additive white Gaussian noise and flat-fading channels. The second investigation deals with the coexistence of UWB systems with narrowband interference based on experimentation.
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