Title :
Lp-Norm Spectrum Sensing for Cognitive Radio Networks Impaired by Non-Gaussian Noise
Author :
Moghimi, Farzad ; Nasri, Amir ; Schober, Robert
Author_Institution :
Univ. of British Columbia, Vancouver, BC, Canada
Abstract :
In cognitive radio (CR) systems reliable spectrum sensing techniques are required in order to avoid interference to the primary users of the spectrum. Whereas most of the existing literature on spectrum sensing considers impairment by additive white Gaussian noise (AWGN) only, in practice, CRs also have to cope with various types of non-Gaussian noise such as man-made impulsive noise, co-channel interference, and ultrawideband interference. In this paper, we propose robust Lp-norm detectors which do not require any a priori knowledge about the primary user signal and perform well for a wide range of nonGaussian noises. Furthermore, we analyze the probabilities of false alarm and missed detection of the proposed detectors in the low signal-to-noise ratio regime. For optimization of Lp-norm detection we propose a direct approach based on minimization of the probability of false alarm for a given probability of missed detection and a simpler approach based on maximization of the deflection coefficient of the detector. Analytical and simulation results show that the proposed Lp-norm detectors achieve significant performance gains over conventional energy detection in non-Gaussian noise.
Keywords :
AWGN; cochannel interference; cognitive radio; maximum likelihood detection; Lp-norm spectrum sensing; additive white Gaussian noise; cochannel interference; cognitive radio; false alarm probability; man-made impulsive noise; maximum likelihood detection; nonGaussian noise; reliable spectrum sensing; ultrawideband interference; AWGN; Additive white noise; Chromium; Cognitive radio; Detectors; Gaussian noise; Interchannel interference; Noise robustness; Signal analysis; Ultra wideband technology;
Conference_Titel :
Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-4148-8
DOI :
10.1109/GLOCOM.2009.5425992