Joint transmit power allocation and splitting for swipt aided OFDM-IDMA in wireless sensor networks

Shanshan Li, Xiaotian Zhou, Cheng Xiang Wang, Dongfeng Yuan, Wensheng Zhang

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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.

Original languageEnglish
Article number1566
JournalSensors (Switzerland)
Volume17
Issue number7
DOIs
Publication statusPublished - 4 Jul 2017

Keywords

  • Iterative Multi-User Detection (iterative MUD)
  • Orthogonal Frequency Division Multiplexing-Interleave Division Multiple Access (OFDM-IDMA)
  • Power allocation
  • Signal to Interference and Noise Ratio (SINR)
  • Simultaneous Wireless Information and Power Transfer (SWIPT)

ASJC Scopus subject areas

  • Analytical Chemistry
  • Atomic and Molecular Physics, and Optics
  • Biochemistry
  • Electrical and Electronic Engineering

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