NDLI: Improving the Sensing–Throughput Tradeoff for Cognitive Radios in Rayleigh Fading Channels

Content Provider	IEEE Xplore Digital Library
Author	Soltanmohammadi, E. Orooji, M. Naraghi-Pour, M.
Copyright Year	1967
Abstract	In-band spectrum sensing (SS) in overlay cognitive radio networks requires that the secondary users (SUs) periodically suspend their communication to determine whether the primary user (PU) has started to utilize the channel. In contrast, in spectrum monitoring (SM), the SU can detect the emergence of the PU from its own receiver statistics such as receiver error count (REC). Previously, it has been shown that in additive white Gaussian noise channels, a hybrid SS/SM system significantly improves the channel utilization of SUs and the detection delay of PUs. In this paper, we investigate the problem of SM in the presence of fading, where the SU employs diversity combining to mitigate the channel fading effects. We show that a decision statistic based on the REC alone does not provide good performance. Next, we introduce new decision statistics based on the REC and the combiner coefficients. It is shown that the new decision statistic achieves significant improvement in the case of maximal ratio combining (MRC). However, for equal gain combining and selection combining, the inclusion of combiner coefficients does not improve the performance over REC alone. In the case of MRC, we evaluate the receiver operating characteristics (ROCs) from analysis and compare the results with those from simulations using a BCH code as well as a convolutional code. The results show a close match between analysis and simulation results. Channel utilization and detection delay are evaluated from simulations which show that with MRC and the proposed decision statistic, the hybrid SS/SM system significantly outperforms the SS alone.
Sponsorship	IEEE Vehicular Technology Society
Starting Page	2118
Ending Page	2130
Page Count	13
File Size	1296223
File Format	PDF
ISSN	00189545
Volume Number	62
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Diversity reception Receivers Sensors Fading Channel estimation Signal to noise ratio Monitoring spectrum sensing (SS) Channel utilization detection delay diversity combining fading channel spectrum monitoring (SM)
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Automotive Engineering Computer Networks and Communications Electrical and Electronic Engineering Aerospace Engineering

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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Improving Detection Delay in Cognitive Radios Using Secondary-User Receiver Statistics

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