1 The concept of cognitive radio
Narayan B. Mandayam and Chandrasekharan Raman
1.1 Motivation for cognitive radios: spectrum is underutilized
Wireless spectrum is one of the most important resources required for radio communications. Throughout the world, spectrum utilization is regulated so that essential services can be provided and also protected from harmful interference. Traditional spectrum governance across the world has tended toward static long-term exclusivity of spectrum use in large geographic areas, often based on the radio technologies employed at the time of decision making. In particular, until recently spectrum regulatory bodies such as the Federal Communications Commission (FCC) in the US or the European Telecommunications ...