Interference modeling of pulse-based UWB waveforms on narrowband systems

Due to the inherent overlay nature of ultrawideband (UWB) systems, it is important to understand and quantify the potential interference caused to narrowband systems that may be located within the bandwidth of the UWB waveform. The simplest way to treat UWB interference is to model it as additive, white Gaussian noise within the bandwidth of the narrowband receiver. However, previous experiments showed that the interference of UWB systems is a function of many factors, including the modulation used, the pulse repetition frequency, the center frequency of the "narrowband" system, and the structure of the "narrowband" receiver. This paper quantifies the effect that a UWB interferer has on the bit error probability of a generic "narrowband" system in order to determine the applicability of the white, Gaussian noise model. These results can also be used to help properly design a UWB system that causes minimal interference to known, overlayed narrowband systems.