DocumentCode :
59466
Title :
Relay-assisted spectrum sensing
Author :
Astaneh, Saeed Akhavan ; Gazor, S.
Author_Institution :
Dept. of Math. & Stat., Queen´s Univ., Kingston, ON, Canada
Volume :
8
Issue :
1
fYear :
2014
fDate :
Jan. 3 2014
Firstpage :
11
Lastpage :
18
Abstract :
A cooperative spectrum-sensing problem has been considered here, in which a network of secondary users (SUs) assists a fusion centre (FC) in detecting the presence of a primary user (PU). Assuming communication links with unlimited capacity of the SUs and FC and known channel gains and noise variances, the optimal Neyman-Pearson detector is derived. Assuming limited capacity between the SUs and FC and unknown channel gains and noise variances, three different spectrum-sensing protocols have been studied; namely, amplify-and-forward (AF), compress-and-forward (CF) and detect-and-forward (DF), where each SU transmits an amplified or compressed version of its observed signal, or its local binary decision to the FC, respectively. The Edgeworth expansion is used to obtain novel expressions for the performance of these detectors. The theoretical analysis and numerical results show that the CF and OR detectors outperform the other proposed detectors. In addition, the simulation results show that the performance of the coded protocols (CF and DF) improves as the number of samples increases or as the noise variance at the SUs decreases, whereas such a behaviour cannot be guaranteed in the uncoded AF protocol.
Keywords :
amplify and forward communication; cooperative communication; protocols; radio links; radio spectrum management; relay networks (telecommunication); CF; DF; Edgeworth expansion; PU; amplify-and-forward; channel gains; coded protocols; communication links; compress-and-forward; cooperative spectrum-sensing problem; detect-and-forward; fusion centre; local binary decision; noise variances; optimal Neyman-Pearson detector; primary user; relay-assisted spectrum sensing; secondary users; spectrum-sensing protocols; uncoded AF protocol;
fLanguage :
English
Journal_Title :
Communications, IET
Publisher :
iet
ISSN :
1751-8628
Type :
jour
DOI :
10.1049/iet-com.2013.0232
Filename :
6712009
Link To Document :
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