Publication Date:
2014-06-19
Description:
In this paper, we propose a semi-distributed cooperative spectrum sensing (SDCSS) and channel accessframework for multi-channel cognitive radio networks (CRNs). In particular, we consider aSDCSS scheme where secondary users (SUs) perform sensing and exchange sensing outcomes witheach other to locate spectrum holes. In addition, we devise the p-persistent CSMA-based cognitivemedium access control (MAC) protocol integrating the SDCSS to enable efficient spectrum sharingamong SUs. We then perform throughput analysis and develop an algorithm to determine the spectrumsensing and access parameters to maximize the throughput for a given allocation of channelsensing sets. Moreover, we consider the spectrum sensing set optimization problem for SUs to maximizethe overall system throughput. We present both exhaustive search and low-complexity greedyalgorithms to determine the sensing sets for SUs and analyze their complexity. We also show how ourdesign and analysis can be extended to consider reporting errors. Finally, extensive numerical resultsare presented to demonstrate the significant performance gain of our optimized design frameworkwith respect to non-optimized designs as well as the impacts of different protocol parameters on thethroughput performance.
Print ISSN:
1687-1472
Electronic ISSN:
1687-1499
Topics:
Electrical Engineering, Measurement and Control Technology
,
Computer Science
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