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Optimisation of throughput in cognitive radio networks: an analysis at the data link layer

Optimisation of throughput in cognitive radio networks: an analysis at the data link layer

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  • Author(s): Q. Wang 1, 2 ; D.-W. Yue 1, 2 ; F.C.M. Lau 3
    • View affiliations
    • Affiliations: 1: College of Information Science and Technology, Dalian Maritime University, Dalian, People's Republic of China
      2: National Mobile Communications Research Laboratory, Southeast University, Nanjing, People's Republic of China
      3: Department of Electronic and Information Engineering, Hong Kong Polytechnic University, Kowloon, Hong Kong
  • Source: Volume 6, Issue 1, 4 January 2012, p. 1 – 12
    DOI:  10.1049/iet-com.2010.0747 , Print ISSN 1751-8628, Online ISSN 1751-8636
© The Institution of Engineering and Technology
Published

In this study, the authors investigate the optimal sensing settings that can maximise the throughput of the cognitive radio (CR) users under the constraint that the signals from the primary users (PUs) are sufficiently protected. They focus on the throughput at the data link layer where end-to-end delivery of data packets is considered. Consequently, the throughput is defined as the rate at which correct data are received. They reconsider the tradeoff between the sensing settings and the throughput. They also separately perform optimisation on the throughput when cooperative spectrum sensing (CSS) is/is not used. In order to evaluate the throughput, they further derive the exact symbol-error-rate (SER) expressions in the presence of co-channel interference. After proving that the throughput functions are unimodal, they proposed two efficient and effective algorithms that can derive the optimal settings for maximising the throughput. Finally, the authors show that their numerical results and compare optimal results with those found by exhaustive searches. They conclude that their algorithms produce optimal results very close to those found by exhaustive searches.

Inspec keywords: cochannel interference; optimisation; cognitive radio

Other keywords: SER expressions; symbol-error-rate; end-to-end delivery; cochannel interference; cognitive radio networks; cooperative spectrum sensing; data link layer; optimal sensing; optimisation; data packets

Subjects: Radio links and equipment; Optimisation techniques

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