A Modified- Fast Spectrum Sensing with Coordinate System under Path Loss Effect and Noise Uncertainty for Cognitive Radio Networks
A Modified- Fast Spectrum Sensing with Coordinate System under Path Loss Effect and Noise Uncertainty for Cognitive Radio Networks
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2015
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eng
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application/pdf
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10 pages
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Journal of Convergence Information Technology(JCIT) Volume10, Number5, September 2015, 32-41
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Abstract
Spectrum sensing is a critical function for cognitive radio which is used to continually monitor the
activities of PU in the licensed spectrum band. In this paper, we first re-derive some parameters of FSC
algorithm, which is called Modified- fast spectrum sensing with coordinate system (MFSC), to perform
spectrum sensing under path loss effect and noise uncertainty. Then, performance of three knowledgebased
spectrum sensing techniques — MFD, LED and MFSC — are evaluated under path loss effect and
noise uncertainty. From the simulation results, we found that MFD gives the highest probability of
detection when noise uncertainty does not exist. However its detection performance greatly degrades
due to the occurrence of noise uncertainty. On the other hand, the effect of noise uncertainty does not
cause any degradation to the detection performance of LED, however the detection performance of LED
is worse than MFSC. When both factors — path loss and noise uncertainty — are both taken in the
account, MFSC algorithm is the most achievable of spectrum sensing requirement since it gives high
detection performance while consumes the least average sensing time.