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Transceiver Design and Power Allocation for SWIPT in MIMO Cognitive Radio Systems

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Jiangxi Province Key Laboratory of Intelligent Information Systems, Nanchang University, Nanchang 330031, China
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Information Engineering School, Nanchang University, Nanchang 330031, China
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Information Systems Research Centre, Macao Polytechnic Institute, Macao 999078, China
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Department of Systems and Computer Engineering, Carleton University, Ottawa, ON K1S 5B6, Canada
*
Author to whom correspondence should be addressed.
Symmetry 2018, 10(11), 647; https://doi.org/10.3390/sym10110647
Received: 17 October 2018 / Revised: 8 November 2018 / Accepted: 12 November 2018 / Published: 18 November 2018
In this paper, we consider a symmetric wireless communication network, i.e., each user is equipped with the same number of antennas. Specifically, this paper studies simultaneous wireless information and power transfer (SWIPT) in a K-user multiple-input multiple-output (MIMO) cognitive radio network where the secondary users (SUs) access the same frequency band as the pre-existing primary user (PU) without generating any interference. The transceivers and power splitting ratio are designed and power allocation is considered in our system model. To guarantee the signal-to-interference-plus-noise ratio (SINR) and harvested energy requirement of the PU, its optimal transceiver and minimal transmitted power are obtained by the technique of semi-definite relaxation (SDR). We design the beamformers of the SUs using the distance between the interference subspaces at the PU and the null space of PU’s desired signal to preserve the PU from the interference caused by the SUs. We aim to maximize the sum rate of all the SUs by jointly designing power splitting ratios and allocating transmission power. Furthermore, to consider the performance fairness of SUs, we propose another approach to maximize the minimum SINR of the SUs. Finally, numerical results are given to evaluate the performance of proposed approaches. View Full-Text
Keywords: simultaneous wireless information and power transfer (SWIPT); power splitting; cognitive radio; multiple-input multiple-output (MIMO) simultaneous wireless information and power transfer (SWIPT); power splitting; cognitive radio; multiple-input multiple-output (MIMO)
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Wu, F.; Xiao, L.; Yang, D.; Cuthbert, L.; Liu, X. Transceiver Design and Power Allocation for SWIPT in MIMO Cognitive Radio Systems. Symmetry 2018, 10, 647.

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