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Analysis and Optimization of Random Sensing Order in Cognitive Radio Systems
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0001-6737-0266
KTH, School of Electrical Engineering (EES), Automatic Control.ORCID iD: 0000-0001-9810-3478
2013 (English)Conference paper, Poster (with or without abstract) (Other academic)
Abstract [en]

Developing an efficient spectrum access policy enables cognitive radios to dramatically increase spectrum utilization while assuring predetermined quality of service levels for the primary users. In this letter, modeling, performance analysis, and optimization of a distributed secondary network with random sensing order policy are studied. Specifically, the secondary users create a random order of the available channels to sense and find a transmission opportunity in a distributed manner. For this network, the average throughputs of the secondary users and average interference level between the secondary and primary users are evaluated by a new Markov model. Then, a maximization of the secondary network performance in terms of throughput while keeping under control the average interference is proposed. Then, a simple and practical adaptive algorithm is developed to optimize the network in a distributed manner. Interestingly, the proposed algorithm follows the variations of the wireless channels in non-stationary conditions and besides having substantially lower computational cost, it outperforms static brute force optimization. Finally, numerical results are provided to demonstrate the efficiencies of the proposed schemes. It is shown that fully distributed algorithms can achieve substantial performance improvements in cognitive radio networks without the need of centralized management or message passing among the users.

Place, publisher, year, edition, pages
2013.
Keyword [en]
Cognitive radio networks, spectrum mobility, average throughput, average interference, distributed optimization
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-137104OAI: oai:DiVA.org:kth-137104DiVA: diva2:677993
Conference
The Fifth Nordic Workshop on System and Network Optimization for Wireless (SNOW'14),
Note

QC 20131213

Available from: 2013-12-10 Created: 2013-12-10 Last updated: 2013-12-13Bibliographically approved

Open Access in DiVA

SNOW1(161 kB)224 downloads
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File name FULLTEXT01.pdfFile size 161 kBChecksum SHA-512
1b6cad10171ffd4f8d75dbf96f5587a09c46f3cdf827735254ac2f07c3a8234322cdae35a902836548711b1be7c49cdd40f8b4e3456758a61a2634b9cb761549
Type fulltextMimetype application/pdf

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http://snow.itn.liu.se/index.html

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Shokri-Ghadikolaei, HosseinFischione, Carlo

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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Language
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  • Other locale
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Output format
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