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Entropy 2017, 19(9), 484; doi:10.3390/e19090484

Simultaneous Wireless Information and Power Transfer for MIMO Interference Channel Networks Based on Interference Alignment

1
School of Information, Qilu University of Technology, Jinan 250353, China
2
Shandong Provincial Key Laboratory of Wireless Communication Technologies, Shandong University, Jinan 250100, China
3
Shandong Computer Science Center (National Supercomputer Center in Jinan), Shandong Provincial Key Laboratory of Computer Networks, Jinan 250014, China
*
Author to whom correspondence should be addressed.
Received: 1 July 2017 / Revised: 2 September 2017 / Accepted: 8 September 2017 / Published: 13 September 2017
(This article belongs to the Special Issue Network Information Theory)
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Abstract

This paper considers power splitting (PS)-based simultaneous wireless information and power transfer (SWIPT) for multiple-input multiple-output (MIMO) interference channel networks where multiple transceiver pairs share the same frequency spectrum. As the PS model is adopted, an individual receiver splits the received signal into two parts for information decoding (ID) and energy harvesting (EH), respectively. Aiming to minimize the total transmit power, transmit precoders, receive filters and PS ratios are jointly designed under a predefined signal-to-interference-plus-noise ratio (SINR) and EH constraints. The formulated joint transceiver design and power splitting problem is non-convex and thus difficult to solve directly. In order to effectively obtain its solution, the feasibility conditions of the formulated non-convex problem are first analyzed. Based on the analysis, an iterative algorithm is proposed by alternatively optimizing the transmitters together with the power splitting factors and the receivers based on semidefinite programming (SDP) relaxation. Moreover, considering the prohibitive computational cost of the SDP for practical applications, a low-complexity suboptimal scheme is proposed by separately designing interference-suppressing transceivers based on interference alignment (IA) and optimizing the transmit power allocation together with splitting factors. The transmit power allocation and receive power splitting problem is then recast as a convex optimization problem and solved efficiently. To further reduce the computational complexity, a low-complexity scheme is proposed by calculating the transmit power allocation and receive PS ratios in closed-form. Simulation results show the effectiveness of the proposed schemes in achieving SWIPT for MIMO interference channel (IC) networks. View Full-Text
Keywords: energy harvesting; interference alignment; interference channel; multi-input multi-output (MIMO); simultaneous wireless information and power transfer (SWIPT); transceiver design; power splitting energy harvesting; interference alignment; interference channel; multi-input multi-output (MIMO); simultaneous wireless information and power transfer (SWIPT); transceiver design; power splitting
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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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Dong, A.; Zhang, H.; Shu, M.; Yuan, D. Simultaneous Wireless Information and Power Transfer for MIMO Interference Channel Networks Based on Interference Alignment. Entropy 2017, 19, 484.

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