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Cognitive radio is a new technology which compliments the wireless devices by improving the efficiency, speed and reliability. There is always a huge demand for the spectrum usage as the availability of the radio spectrum is limited. Cognitive radio technology is seen as a potential solution to the efficient utilization of available spectrum by the unlicensed legitimate users. One of the major threats of cognitive radio network is the Primary User Emulation attack. In this paper a survey of Cognitive Radio techniques with its IEEE 802.22 standard, various defensive methods against PUE attack, primary signal detection methods and the features of SpiderRadio, a cognitive radio device are presented.