The state of the art of dynamic spectrum access

Cognitive Radio is one of the most promising para- digms for wireless communication, as it enables a flexible use of the radio spectrum. For this, several new techniques were developed that provide a good overview about the current spectrum usage and fa- cilitate dynamic adaptation to it. Moreover, it was investigated how to integrate those techniques into the current static spectrum assignment. This article surveys the state of the art of those methodologies that pave the way for Cognitive Radio usage in the military domain.