dc.citation.conferencePlace |
US |
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dc.citation.conferencePlace |
Chicago, IL |
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dc.citation.endPage |
231 |
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dc.citation.startPage |
220 |
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dc.citation.title |
IEEE DySPAN : 3rd IEEE Symposia on New Frontiers in Dynamic Spectrum Access Networks |
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dc.contributor.author |
Kim, Hyoil |
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dc.contributor.author |
Shin, K.G. |
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dc.date.accessioned |
2023-12-20T04:36:14Z |
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dc.date.available |
2023-12-20T04:36:14Z |
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dc.date.created |
2014-12-23 |
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dc.date.issued |
2008-10-15 |
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dc.description.abstract |
We address the problem of rapidly discovering spectrum opportunities for seamless service provisioning for secondary users (SUs) in cognitive radio networks (CRNs). Specifically, we propose an efficient sensing-sequence that incurs a small opportunity-discovery delay by considering (1) the probability that a spectrum band (or a channel) may be available at the time of sensing, (2) the duration of sensing on a channel, and (3) the channel capacity. We derive the optimal sensing-sequence for channels with homogeneous capacities, and a suboptimal sequence for channels with heterogeneous capacities for which the problem of finding the optimal sensing-sequence is shown to be NP-hard. To support the proposed sensing-sequence, we also propose a channel-management strategy that optimally selects and updates the list of backup channels. A hybrid of maximum likelihood (ML) and Bayesian inference is also introduced for flexible estimation of ON/OFF channel-usage patterns and prediction of channel availability when sensing produces infrequent samples. The proposed schemes are evaluated via in-depth simulation. For the scenarios we considered, the proposed suboptimal sequence is shown to achieve close-to-optimal performance, reducing the opportunity-discovery delay by up to 47% over an existing probability-based sequence. The hybrid estimation strategy is also shown to outperform the ML-only strategy by reducing the overall opportunity-discovery delay by up to 34%. |
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dc.identifier.bibliographicCitation |
IEEE DySPAN : 3rd IEEE Symposia on New Frontiers in Dynamic Spectrum Access Networks, pp.220 - 231 |
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dc.identifier.doi |
10.1109/DYSPAN.2008.30 |
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dc.identifier.scopusid |
2-s2.0-57849093582 |
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dc.identifier.uri |
https://scholarworks.unist.ac.kr/handle/201301/46846 |
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dc.identifier.url |
https://ieeexplore.ieee.org/document/4658241 |
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dc.language |
영어 |
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dc.publisher |
IEEE |
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dc.title |
Fast Discovery of Spectrum Opportunities in Cognitive Radio Networks |
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dc.type |
Conference Paper |
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dc.date.conferenceDate |
2008-10-14 |
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