Abstract
Secure communication is critical in wireless networks due to the openness of the wireless transmission medium. In this paper, we study the secure communication in a multicarrier orthogonal frequency division multiplexing (OFDM) decode-and-forward (DF) relay network with an energy-constrained relay node which operates with a time-switching (TS) protocol. By jointly designing TS ratios of energy harvesting (EH) and information-decoding (ID) at the relay, TS ratio of signal forwarding from relay to destination and power allocation (PA) over all subcarriers at source and relay, we aim at maximizing the achievable secrecy rate of the DF relay network subject to a maximum transmit power constraint at source and an EH constraint at relay. The formulated optimization problem is a non-convex problem. We decouple it into a convex problem and a non-convex problem, where the non-convex problem can be solved by a constrained concave convex procedure (CCCP) based iterative algorithm to achieve a local optimum. Simulation results verify that our proposed joint TS and PA scheme achieves nearly global optimal resource allocation and outperforms the existing resource allocation scheme.
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Acknowledgments
The research work was supported by the Guangdong science and technology project (No. 2016A010101032), Guangzhou science and technology project (No. 2014J4100142) and Guangzhou college and university science and technology project (No. 1201421329).
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© 2018 ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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Chen, X., Huang, G., Lin, Y., Liang, Z., Huang, J. (2018). Joint Time Switching and Power Allocation for Secure Multicarrier Decode-and-Forward Relay Systems with Wireless Information and Power Transfer. In: Chen, Q., Meng, W., Zhao, L. (eds) Communications and Networking. ChinaCom 2016. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering, vol 209. Springer, Cham. https://doi.org/10.1007/978-3-319-66625-9_28
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DOI: https://doi.org/10.1007/978-3-319-66625-9_28
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