COGNITIVE RADIO TECHNOLOGY: ARCHITECTURE, SENSING AND APPLICATIONS-A SURVEY

G Mukesh, K Santhosh Kumar
unpublished
There have been rapid advancements in the field of wireless communications and the number of devices which can be accessed in the licensed and unlicensed bands of the electromagnetic spectrum have been increasing by leaps and bounds. In the past, spectrum allocation was based on the specific band assignments designated for a particular service. Although the fixed spectrum assignment policy generally worked well in the past, there has been a dramatic increase in the access to limited spectrum
more » ... limited spectrum for mobile services and applications in the recent years. Moreover, large portions of the licensed spectrum bands are vastly underutilized. The significant underutilization of the licensed spectrum coupled with the heavy overutilization of the unlicensed portion of the wireless spectrum has motivated the need for a new spectrum management paradigm that can be accessed in a dynamic way. This is where the cognitive radio technology comes into picture.
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