Abstract
Spectrum sharing and energy harvesting (EH) are promising techniques to enhance the spectrum and energy efficiency of wireless networks. In this paper, we propose a spectrum sharing scheme based on the cooperative energy and data transfer in both the time and space domains. When the primary base station (PB) transfers energy to the primary user (PU), the secondary user (SU) can transmit its own data simultaneously, and the interference of secondary data transmission becomes beneficial to improve the EH efficiency of the PU. Furthermore, the SU can assist the primary data relaying using the Alamouti coding technique to improve the link robustness through introducing the space diversity. With the energy and data cooperation from the SU, the primary data can be more quickly and reliably delivered, and hence more opportunities can be achieved for the spectrum sharing. Considering the dependence of the energy and data transfer, the throughput of both systems is investigated. The time allocation between EH and data transmission can be numerically determined by maximizing the throughput of secondary system under the throughput constraint of primary system. Performance results are presented to validate our theoretical analysis and provide some guidelines for the network configuration.
Highlights
The radio frequency (RF) energy harvesting (EH) is a promising technique that enables the smart power-limited devices to harvest energy from the electromagnetic radiation [1]
The rapid advancement of the EH materials and devices makes the network coupling with EH devices a reality [5], e.g., the Powerharvester Receivers designed by the Powercast can harvest the RF energy to charge the remote battery-free devices [6]
We propose a spectrum sharing scheme based on the cooperative energy and data transfer for the cognitive radio network, where a secondary link is overlaid with a primary link
Summary
The radio frequency (RF) energy harvesting (EH) is a promising technique that enables the smart power-limited devices to harvest energy from the electromagnetic radiation [1]. To combat the low efficiency of half-duplex cooperative protocols, Zhai et al proposed the spectrum sharing based on the two-path successive relaying [12], where two SUs can alternatively and successively relay the primary data and transmit their own data using the superposition coding technique, while the successive interference cancelation (SIC) techniques is adopted by the receivers to decode the desired information. The SU can use its energy to relay the primary data to improve the link robustness and strive for more opportunities for the spectrum sharing. We propose a spectrum sharing scheme based on the cooperative energy and data transfer for the cognitive radio network, where a secondary link is overlaid with a primary link. The (·)∗ and (·)H represent complex conjugate and Hermitian transpose of matrix, respectively
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