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Full-Duplex Cognitive Radio with RF Energy Harvesting

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Abstract

With the development of self-interference suppression techniques, full-duplex (FD) communication is expected to double the spectrum efficiency (SE). In FD based cognitive radio (CR), the secondary users (SUs) can perform spectrum sensing and data transmission simultaneously, with the goal of achieving better sensing performance or higher throughput for the SUs. Another key performance metric in fifth-generation (5G) wireless networks, energy efficiency (EE), has attracted more and more attention recently. The radio frequency (RF) energy harvesting (EH) technique is proposed to prolong the battery lifetime of low-power communication devices. In this paper, we are interested in the full-duplex CR with energy harvesting. We consider that the SUs can harvest RF energy from the PU and recycle part of its own energy when the secondary data transmission is conducted. The EE of the CR system is defined as the ratio of the average SE over the average power consumption. The system parameters, including the sensing thresholds and the secondary transmit power are optimized to maximize the EE under the constraint that the primary user (PU) is sufficiently protected. Finally, the simulation results are presented to show the outperformance of the proposed FD-EH scheme.

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Acknowledgements

This work is supported by National Postdoctoral Program for Innovative Talents (No. BX201700108), Natural Science Foundation of Shanxi Province of China (No. 2018JQ6042), China Postdoctoral Science Foundation on the 63th grant program, and the National Natural Science Foundation of China (Grant No. 61671475, Grant No. 61901509, Grant No. 61571460).

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Authors and Affiliations

  1. Information and Navigation College, Air Force Engineering University, Xi’an, 710077, China

    Hang Hu & Lei Ni

  2. Yango University, Fuzhou, 350000, Fujian, China

    Xinyu Da

  3. College of Communications Engineering, Army Engineering University of PLA, Nanjing, 210007, China

    Hang Zhang

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  1. Hang Hu
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  2. Xinyu Da
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Correspondence to Hang Hu.

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Hu, H., Da, X., Zhang, H. et al. Full-Duplex Cognitive Radio with RF Energy Harvesting. Wireless Pers Commun 111, 853–865 (2020). https://doi.org/10.1007/s11277-019-06889-8

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