Error exponent analysis of energy-based Bayesian decentralized spectrum sensing under fading

Gurugopinath, Sanjeev and Murthy, Chandra R and Sharma, Vinod (2015) Error exponent analysis of energy-based Bayesian decentralized spectrum sensing under fading. In: PHYSICAL COMMUNICATION, 17 . pp. 94-106.

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Abstract

This paper considers decentralized spectrum sensing, i.e., detection of occupancy of the primary users' spectrum by a set of Cognitive Radio (CR) nodes, under a Bayesian set-up. The nodes use energy detection to make their individual decisions, which are combined at a Fusion Center (FC) using the K-out-of-N fusion rule. The channel from the primary transmitter to the CR nodes is assumed to undergo fading, while that from the nodes to the FC is assumed to be error-free. In this scenario, a novel concept termed as the Error Exponent with a Confidence Level (EECL) is introduced to evaluate and compare the performance of different detection schemes. Expressions for the EECL under general fading conditions are derived. As a special case, it is shown that the conventional error exponent both at individual sensors, and at the FC is zero. Further, closed-form lower bounds on the EECL are derived under Rayleigh fading and lognormal shadowing. As an example application, it answers the question of whether to use pilot-signal based narrowband sensing, where the signal undergoes Rayleigh fading, or to sense over the entire bandwidth of a wideband signal, where the signal undergoes lognormal shadowing. Theoretical results are validated using Monte Carlo simulations. (C) 2015 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	PHYSICAL COMMUNICATION
Publisher:	ELSEVIER SCIENCE BV
Additional Information:	Copy right for this article belongs to the ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Keywords:	Cognitive radio; Energy detection; Error exponents; Spectrum sensing
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	10 Feb 2016 05:53
Last Modified:	10 Feb 2016 05:53
URI:	http://eprints.iisc.ac.in/id/eprint/53211

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