Dummy tone insertion for spectral sculpting of the multi-band OFDM UWB system

As the UWB regulations have not been finalized in many parts of the world, spectral flexibility is a key requirement for an UWB system to win in the global marketplace. The unlicensed nature of the UWB spectrum makes it imperative for these devices to have the capability to coexist with existing services. The multi-band OFDM UWB communication system, standardized by ECMA for high-speed WPAN, has the ability to satisfy these requirements. This paper describes a time-domain windowing technique and a dummy tone insertion mechanism that enable spectral sculpting of a multi-band OFDM UWB communication system. The protection offered to radio astronomy bands in Japan is used as an example to illustrate the advantages of these techniques.