A survey of spectrum sensing algorithms for cognitive radio applications
Yucek, T.; Arslan, H.
Communications Surveys & Tutorials, IEEE
Volume 11, Issue 1, First Quarter 2009 Page(s):116 - 130
Digital Object Identifier   10.1109/SURV.2009.090109
Summary:The spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most challenging issues in cognitive radio systems. In this paper, a survey of spectrum sensing methodologies for cognitive radio is presented. Various aspects of spectrum sensing problem are studied from a cognitive radio perspective and multi-dimensional spectrum sensing concept is introduced. Challenges associated with spectrum sensing are given and enabling spectrum sensing methods are reviewed. The paper explains the cooperative sensing concept and its various forms. External sensing algorithms and other alternative sensing methods are discussed. Furthermore, statistical modeling of network traffic and utilization of these models for prediction of primary user behavior is studied. Finally, sensing features of some current wireless standards are given.

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