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Electronics and Telecommunications Research Institute (한국전자통신연구원)
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Simultaneous Information and Power Transfer for Multi-antenna Primary-Secondary Cooperation in Cognitive Radio Networks

  • Liu, Zhi Hui (Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications) ;
  • Xu, Wen Jun (Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications) ;
  • Li, Sheng Yu (Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications) ;
  • Long, Cheng Zhi (Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications) ;
  • Lin, Jia Ru (Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications)
  • Received : 2015.06.22
  • Accepted : 2016.06.17
  • Published : 2016.10.01
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Abstract

In this paper, cognitive radio and simultaneous wireless information and power transfer (SWIPT) are effectively combined to design a spectrum-efficient and energy-efficient transmission paradigm. Specifically, a novel SWIPT-based primary-secondary cooperation model is proposed to increase the transmission rate of energy/spectrum constrained users. In the proposed model, a multi-antenna secondary user conducts simultaneous energy harvesting and information forwarding by means of power splitting (PS), and tries to maximize its own transmission rate under the premise of successfully assisting the data delivery of the primary user. After the problem formulation, joint power splitting and beamforming optimization algorithms for decode-and-forward and amplify-and-forward modes are presented, in which we obtain the optimal PS factor and beamforming vectors using a golden search method and dual methods. Simulation results show that the proposed SWIPTbased primary-secondary cooperation schemes can obtain a much higher level of performance than that of non-SWIPT cooperation and non-cooperation schemes.

Keywords

References

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