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Sensors 2019, 19(8), 1827; https://doi.org/10.3390/s19081827

Joint Source-Relay Optimization for MIMO Full-Duplex Bidirectional Wireless Sensor Networks with SWIPT

Beijing Key Laboratory of Work Safety Intelligent Monitoring, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
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Received: 4 March 2019 / Revised: 12 April 2019 / Accepted: 12 April 2019 / Published: 17 April 2019
(This article belongs to the Section Sensor Networks)
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Abstract

The simultaneous wireless information and power transfer (SWIPT) technique has been considered as a promising approach to prolong the lifetime of energy-constraint wireless sensor networks (WSNs). In this paper, a multiple-input multiple-output (MIMO) full-duplex (FD) bidirectional wireless sensor network (BWSN) with SWIPT is investigated. Based on minimum total mean-square-error (total-MSE) criterion, a joint optimization problem for source and relay beamforming and source receiving subject to transmitting power and harvesting energy constraints is established. Since this problem is non-convex, an iterative algorithm based on feasible point pursuit-successive convex approximation (FPP-SCA) is derived to obtain a local optimum. Moreover, considering the scenarios in which source and relay nodes equipped with the same and different numbers of antennas, a low-complexity diagonalizing design-based scheme is employed to simplify each non-convex subproblem into convex problems and to reduce the computational complexity. Numerical results of the total-MSE and bit error rate (BER) are implemented to demonstrate the performance of the two different schemes. View Full-Text
Keywords: beamforming; bidirectional wireless sensor network (BWSN); full duplex (FD); multiple-input multiple-output (MIMO); simultaneous wireless information and power transfer (SWIPT) beamforming; bidirectional wireless sensor network (BWSN); full duplex (FD); multiple-input multiple-output (MIMO); simultaneous wireless information and power transfer (SWIPT)
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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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Liu, D.; Wen, Z.; Liu, X.; Li, S.; Zou, J. Joint Source-Relay Optimization for MIMO Full-Duplex Bidirectional Wireless Sensor Networks with SWIPT. Sensors 2019, 19, 1827.

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