Noise floor rise in a generic receiver as a basis for the determination of interference levels to a victim receiver is applied to assess interference to systems that are designed to operate in multipath fading environments. The interference levels might be over estimated by as much a 20 dB if fading is not properly taken into account. The impact of potentially interfering sources such as UWB emissions must be treated as an effect on the overall system reliability. Results here show that low power UWB systems operating at the same levels as unintended radiators can comfortably coexist with conventional users of the radio spectrum without significant impact on the performance of those radio services.
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