Energy Efficient Resource Allocation for Downlink Cooperative Non-Orthogonal Multiple Access Systems

Zi-fu FAN  Qu CHENG  Zheng-qiang WANG  Xian-hui MENG  Xiao-yu WAN  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E101-A   No.9   pp.1603-1607
Publication Date: 2018/09/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E101.A.1603
Type of Manuscript: LETTER
Category: Communication Theory and Signals
cooperative non-orthogonal multiple access,  resource allocation,  fractional programming,  energy efficiency,  

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In this letter, we study the resource allocation for the downlink cooperative non-orthogonal multiple access (NOMA) systems based on the amplifying-and-forward protocol relay transmission. A joint power allocation and amplification gain selection scheme are proposed. Fractional programming and the iterative algorithm based on the Lagrangian multiplier are used to allocate the transmit power to maximize the energy efficiency (EE) of the systems. Simulation results show that the proposed scheme can achieve higher energy efficiency compared with the minimum power transmission (MPT-NOMA) scheme and the conventional OMA scheme.