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Information 2017, 8(4), 141; doi:10.3390/info8040141

Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer

1
Department of Electronic Engineering, Kyung Hee University, Yongin, Gyeonggi-do 17104, Korea
2
Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Received: 19 September 2017 / Revised: 10 October 2017 / Accepted: 1 November 2017 / Published: 8 November 2017
(This article belongs to the Special Issue Wireless Energy Harvesting for Future Wireless Communications)
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Abstract

We consider the simultaneous wireless information and power transfer in two-phase decode-and-forward two-way relaying networks, where a relay harvests the energy from the signal to be relayed through either power splitting or time splitting. Here, we formulate the resource allocation problems optimizing the time-phase and signal splitting ratios to maximize the sum rate of the two communicating devices. The joint optimization problems are shown to be convex for both the power splitting and time splitting approaches after some transformation if required to be solvable with an existing solver. To lower the computational complexity, we also present the suboptimal methods optimizing the splitting ratio for the fixed time-phase and derive a closed-form solution for the suboptimal method based on the power splitting. The results demonstrate that the power splitting approaches outperform their time splitting counterparts and the suboptimal power splitting approach provides a performance close to the optimal one while reducing the complexity significantly. View Full-Text
Keywords: decode-and-forward; resource allocation; simultaneous wireless information and power transfer; two-way relaying decode-and-forward; resource allocation; simultaneous wireless information and power transfer; two-way relaying
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Do, T.P.; Jeong, Y.; Kim, Y.H. Rate Optimization of Two-Way Relaying with Wireless Information and Power Transfer. Information 2017, 8, 141.

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