Energy Efficiency Optimization for NOMA with SWIPT

Jie Tang, Jingci Luo, Mingqian Liu, Daniel Ka Chun So, Emad Alsusa, Gaojie Chen, Kai-kit Wong, Jonathon Chambers

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    Abstract

    The combination of simultaneous wireless information
    and power transfer (SWIPT) and non-orthogonal multiple
    access (NOMA) is a potential solution to improve spectral
    efficiency (SE) and energy efficiency (EE) of the upcoming fifth
    generation (5G) networks, especially in order to support the
    functionality of the Internet of things (IoT) and the massive
    machine-type communications (mMTC) scenarios. In this paper,
    we investigate joint power allocation and time switching (TS)
    control for EE optimization in a TS-based SWIPT NOMA
    system. Our aim is to optimize the EE of the system whilst
    satisfying the constraints on maximum transmit power budget,
    minimum data rate and minimum harvested energy per-terminal.
    The considered EE optimization problem is neither linear nor
    convex involving joint optimization of power allocation and time
    switching factors, and thus is extremely difficult to solve directly.
    In order to tackle this problem, we develop a dual-layer algorithm
    where Dinkelbach method is employed both in the inner-layer to
    optimize the power allocation and in the outer-layer to control
    the time switching assignment. Furthermore, a simplified but
    practical special case with equal time switching factors in all
    terminals is considered. Numerical results validate the theoretical
    findings and demonstrate that significant performance gain over
    orthogonal multiple access (OMA) scheme in terms of EE can be
    achieved by the proposed algorithms in a SWIPT-enabled NOMA
    system.
    Original languageEnglish
    Pages (from-to)452-466
    JournalIEEE Journal of Selected Topics in Signal Processing
    Volume13
    Issue number3
    Early online date7 Feb 2019
    DOIs
    Publication statusPublished - 7 Feb 2019

    Keywords

    • simultaneous wireless information and power transfer (SWIPT)
    • Energy efficiency (EE)
    • non-orthogonal multiple access (NOMA)
    • time switching (TS)

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