Skip to main content
EURASIP Journal on Wireless Communications and Networking
Download PDF

Opportunistic Cognitive Relaying: A Win-Win Spectrum Sharing Scheme

EURASIP Journal on Wireless Communications and Networking volume 2010, Article number: 263405 (2010) Cite this article

Abstract

A cost-effective spectrum sharing architecture is proposed to enable the legacy noncognitive secondary system to coexist with the primary system. Specifically, we suggest to install a few intermediate nodes, namely, the cognitive relays, to conduct the spectrum sensing and coordinate the spectrum access. To achieve the goal of win-win between primary and secondary systems, the cognitive relay may act as a cooperator for both of them, and an Opportunistic Cognitive Relaying (OCR) scheme is specially devised. In this scheme, the cognitive relay opportunistically switches among three different working modes, that is, Relay for Primary Link (RPL), Relay for Secondary Link (RSL), or Relay for Neither of the Links (RNL), respectively, based on the channel-dependent observation of both systems. In addition, the transmit power for cognitive relay and secondary transmitter in each mode are optimally determined by maximizing the transmission rate of secondary system while keeping or even reducing the outage probability of primary system. Simulation results validate the efficiency of the proposed spectrum sharing scheme.

Publisher note

To access the full article, please see PDF.

Author information

Authors and Affiliations

  1. Institute of Information and Communication Engineering, Zhejiang University, Hangzhou, Zhejiang, 310027, China

    Haiyan Luo, Zhaoyang Zhang, Yan Chen, Yan Chen, Wei Wang & Shiju Li

Authors
  1. Haiyan Luo
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Zhaoyang Zhang
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Yan Chen
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Wei Wang
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Shiju Li
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Zhaoyang Zhang.

Rights and permissions

Open Access This article is distributed under the terms of the Creative Commons Attribution 2.0 International License ( https://creativecommons.org/licenses/by/2.0 ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Reprints and permissions

About this article

Cite this article

Luo, H., Zhang, Z., Chen, Y. et al. Opportunistic Cognitive Relaying: A Win-Win Spectrum Sharing Scheme. J Wireless Com Network 2010, 263405 (2010). https://doi.org/10.1155/2010/263405

Download citation

  • Received:

  • Revised:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1155/2010/263405

Keywords