Title :
Effect of uncertainties in modeling interferences in coherent and energy detectors for spectrum sensing
Author_Institution :
Univ. Pompeu Fabra, Barcelona, Spain
fDate :
July 31 2011-Aug. 5 2011
Abstract :
We examine an extreme case of modeling uncertainties in spectrum sensing, whereby the interference which, in addition to additive noise, affects a sensor has an unknown probability distribution, and only its maximum power is known. We deal with a situation in which the sensor disregards the presence of the interference, and we study its performance. Application of moment-bound theory allows the derivation of sharp (i.e., achievable) upper and lower bounds to the receiver operating characteristics of the sensor. Coherent and energy detectors are analyzed. In particular, it is proved that, even in the large signal-to-noise ratio regime, reliable sensing becomes impossible if the maximum interference power exceeds a certain threshold.
Keywords :
cognitive radio; interference suppression; radio receivers; radio spectrum management; statistical distributions; additive noise; coherent detector; energy detectors; interference suppression; lower bounds; modeling uncertainties; moment bound theory; probability distribution; receiver; signal-to-noise ratio; spectrum sensing; upper bounds; Additives; Detectors; Interference; Signal to noise ratio; Uncertainty; Cognitive radio; Detection under uncertainties; Spectrum sensing;
Conference_Titel :
Information Theory Proceedings (ISIT), 2011 IEEE International Symposium on
Conference_Location :
St. Petersburg
Print_ISBN :
978-1-4577-0596-0
Electronic_ISBN :
2157-8095
DOI :
10.1109/ISIT.2011.6033998
