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Optimizing DF Cognitive Radio Networks with Full-Duplex-Enabled Energy Access Points

Research output: Contribution to journalArticlepeer-review

Hong Xing, Xin Kang, Kai Kit Wong, Arumugam Nallanathan

Original languageEnglish
Article number7924326
Pages (from-to)4683-4697
Number of pages15
JournalIEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
Volume16
Issue number7
Early online date10 May 2017
DOIs
E-pub ahead of print10 May 2017
Published1 Jul 2017

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Abstract

With the recent advances in radio frequency (RF) energy harvesting (EH) technologies, wireless powered cooperative cognitive radio network (CCRN) has drawn an upsurge of interest for improving the spectrum utilization with incentive to motivate joint information and energy cooperation between the primary and secondary systems. Dedicated energy beamforming is aimed at remedying the low efficiency of wireless power transfer, which nevertheless arouses out-of-band EH phases and thus low cooperation efficiency. To address this issue, in this paper, we consider a novel CCRN aided by full-duplex (FD)-enabled energy access points (EAPs) that can cooperate to wireless charge the secondary transmitter while concurrently receiving primary transmitter's signal in the first transmission phase, and to perform decode-and-forward relaying in the second transmission phase. We investigate a weighted sum-rate maximization problem subject to transmitting power constraints as well as a total cost constraint using successive convex approximation techniques. A zero-forcing-based suboptimal scheme that requires only local channel state information for the EAPs to obtain their optimum receiving beamforming is also derived. Various tradeoffs between the weighted sum-rate and other system parameters are provided in numerical results to corroborate the effectiveness of the proposed solutions against the benchmark ones.

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