NDLI: Efficient Spectrum Searching and Monitoring in Cognitive Radio Network

Content Provider	IEEE Xplore Digital Library
Author	Saifan, R. Kamal, A.E. Yong Guan
Copyright Year	2011
Abstract	Two objectives of sensing in cognitive radio (CR) are to detect the primary user (PU) accurately and quickly, which are contradicting objectives. Therefore, many papers try to optimize this tradeoff and find the minimum sensing time which protects the PU. The trends are classified in enhancing false alarm probability (Pf) and detection probability (Pd), optimizing inter-sensing time, in-band sensing (monitoring) time optimization, and out-of-band sensing (search) time optimization. The PU model used in most of these work was a simple two states model (busy/idle renewal process). In this work, we developed a model for the PU in its idle state. The model enables the CR node to benefit from its previous measurements. It assumes that there are multi-idle states, each with specific length and known probability of staying in it. We used this model to find the best sensing time, energy detection threshold, and false alarm probability of the channel being sensed in monitoring. Also, we developed an out-of-band optimization formulation. The formulation finds the best number of channels to sense, the threshold of each channel, the sensing time of each channel, and Pf of each channel such that the PU is protected, the sensing time is minimized, and the CR will find an available channel with very high probability.
Starting Page	520
Ending Page	529
File Size	356525
Page Count	10
File Format	PDF
ISBN	9781457713453
ISSN	21556806
DOI	10.1109/MASS.2011.57
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-10-17
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Switches Interference Sensors Mathematical model Monitoring Optimization Equations
Content Type	Text
Resource Type	Article

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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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