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Fixed threshold based conventional energy detection methods may not work well in low signal-to-noise (SNR) cognitive radio (CR) scenarios where the ability to detect a primary user or to avoid a false alarm has been found to be severely degraded. In this paper, we investigate the effect of low SNR on a static threshold based energy detector. We discuss the reasons for the degradation in performance...
Spectrum sensing techniques for Cognitive radios have led to the emergence of a wide variety of analytical methods to detect the presence of a primary user. Though each technique has its own advantages, the disadvantages associated with them makes a standalone implementation of the technique unviable for practical use. A two stage detector for spectrum sensing can be used to mitigate the disadvantages...
The performance of a cognitive radio system depends on how well it can maximize the usage of a free frequency band without causing any interference to the primary user. Thus the abilities to detect a primary user as well as to avoid any false alarm are of paramount importance for such a system. For energy detector based spectrum sensing in cognitive radios, these abilities are influenced by the threshold...
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