Detect and Avoid (DAA) for UWB: Implementation Issues and Challenges

The recent history of ultrawideband communications technology has seen great debate over whether UWB causes unacceptable interference to existing users of the same and nearby bands. In the current regulatory environment, the UWB industry must work with incumbent users to implement interference mitigation techniques that are generally called detect and avoid (DAA). This paper explores the problems in DAA implementation and poses the question whether implementation of UWB in the upper bands (>6GHz), which do not require DAA, may be a more practical solution to the spectrum sharing problem.