In a CR network with location-capable nodes, the concept of coexistence must be extended to ranging and localization, since they become an integral part of the CR engine. This means that a location-capable CR network needs to adapt its characteristics to the environment with the goal to guarantee, for instance, a given ranging accuracy despite the interference. This idea is the basis of cognitive positioning systems, where the localization accuracy can be varied
according to bandwidth availability and corresponding waveform (spectrum) adaptation [26,27]. A similar approach is addressed in the general framework of cognitive radar [28].