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Sensors 2017, 17(7), 1566; doi:10.3390/s17071566

Joint Transmit Power Allocation and Splitting for SWIPT Aided OFDM-IDMA in Wireless Sensor Networks

1
Shandong Provincial Key Laboratory of Wireless Communication Technologies, School of Information Science and Engineering, Shandong University, Jinan 250100, China
2
Institute of Sensors, Signals and Systems, School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, UK
*
Author to whom correspondence should be addressed.
Received: 5 June 2017 / Revised: 30 June 2017 / Accepted: 1 July 2017 / Published: 4 July 2017
(This article belongs to the Special Issue Energy Harvesting Sensors for Long Term Applications in the IoT Era)
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Abstract

In this paper, we propose to combine Orthogonal Frequency Division Multiplexing-Interleave Division Multiple Access (OFDM-IDMA) with Simultaneous Wireless Information and Power Transfer (SWIPT), resulting in SWIPT aided OFDM-IDMA scheme for power-limited sensor networks. In the proposed system, the Receive Node (RN) applies Power Splitting (PS) to coordinate the Energy Harvesting (EH) and Information Decoding (ID) process, where the harvested energy is utilized to guarantee the iterative Multi-User Detection (MUD) of IDMA to work under sufficient number of iterations. Our objective is to minimize the total transmit power of Source Node (SN), while satisfying the requirements of both minimum harvested energy and Bit Error Rate (BER) performance from individual receive nodes. We formulate such a problem as a joint power allocation and splitting one, where the iteration number of MUD is also taken into consideration as the key parameter to affect both EH and ID constraints. To solve it, a sub-optimal algorithm is proposed to determine the power profile, PS ratio and iteration number of MUD in an iterative manner. Simulation results verify that the proposed algorithm can provide significant performance improvement. View Full-Text
Keywords: Simultaneous Wireless Information and Power Transfer (SWIPT); Orthogonal Frequency Division Multiplexing-Interleave Division Multiple Access (OFDM-IDMA); iterative Multi-User Detection (iterative MUD); Signal to Interference and Noise Ratio (SINR); Power Allocation Simultaneous Wireless Information and Power Transfer (SWIPT); Orthogonal Frequency Division Multiplexing-Interleave Division Multiple Access (OFDM-IDMA); iterative Multi-User Detection (iterative MUD); Signal to Interference and Noise Ratio (SINR); Power Allocation
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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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MDPI and ACS Style

Li, S.; Zhou, X.; Wang, C.-X.; Yuan, D.; Zhang, W. Joint Transmit Power Allocation and Splitting for SWIPT Aided OFDM-IDMA in Wireless Sensor Networks. Sensors 2017, 17, 1566.

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