Provided by: International Journal of Advanced Research in Computer and Communication Engineering (IJARCCE)
Date Added: Oct 2014
In this paper, the authors present an overview of cognitive radio and cognitive radio network. The report list enabling technique for cognitive radio and describe the state-of-art in cognitive radio standards, regulation, product and research. The availability of spectrum holes, i.e., frequency band assigned to a primary user but that are vacant in a given place at a given time, can be estimated with spectrum sensing technique, such as energy detection & feature detection. When little or no knowledge of the primary user signal is available, energy detection is useful while feature detection can exploit a priori information about the used waveforms.