Abstract
A cognitive device-to-device (D2D) network with D2D transmitters (DTs) that harvest radio-frequency energy from the primary transmitters (PTs) is investigated. A novel D2D transmitter-assisted cooperative (DTAC) protocol is proposed, in which a group of DTs that have no transmission opportunity act as potential relays to improve the communications of the primary network. The outage probability of the primary networ is characterized and used to make comparisons between the direct link and the cooperative link which adopts selection combining and maximal-ratio combining (MRC) schemes at the primary receivers. The cooperative link with MRC scheme improves the outage performance of the primary network with direct link, as much as 93%. The active probability of the DTs and the outage probability are derived, and the D2D network throughput is maximized by finding an optimal transmission power for the PTs. Simulation results are provided to validate the theoretical analysis.
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This work was supported in part by the National Natural Science Foundation of China under Grants 61629101 and 61671086.
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Yao, Y., Huang, S. & Yin, C. Cooperative transmission in energy harvesting-based cognitive D2D networks. Wireless Netw 24, 2579–2588 (2018). https://doi.org/10.1007/s11276-017-1480-7
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DOI: https://doi.org/10.1007/s11276-017-1480-7