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Energy and spectrum efficient power allocation with NOMA in downlink HetNets

机译：下行链路HetNet中使用NOMA进行能量和频谱有效的功率分配

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摘要

This paper investigates the tradeoff between energy efficiency (EE) and spectrum efficiency (SE) in a downlink non-orthogonal multiple access (NOMA)-based heterogeneous networks (HetNets). The tradeoff problem is formulated as a multi-objective optimization problem (MOP). Under the constraints of maximum transmit power of small cell users (SUEs) and minimum rate requirements, both EE and SE are maximized. In order to make the MOP tractable, a weighted sum method is used to transform it into a single-objective optimization problem (SOP), which enables the network providers to dynamically tune the weight factor to adapt to different EE and SE design requirements. To solve the transformed SOP, a SUE allocation algorithm is proposed to determine the multiple SUEs for each sub-channel, based on which a power proportional factor determination algorithm for SUEs and a novel power allocation algorithm for sub-channels are proposed. Numerical results show the fast convergence property, and demonstrate that the EE and SE obtained by our algorithms are Pareto optimal solutions and superior to the conventional orthogonal multiple access scheme. (C) 2018 Elsevier B.V. All rights reserved.
机译：本文研究了基于下行链路非正交多路访问（NOMA）的异构网络（HetNets）中能量效率（EE）与频谱效率（SE）之间的折衷。权衡问题被表述为多目标优化问题（MOP）。在小小区用户（SUE）的最大发射功率和最小速率要求的约束下，EE和SE均最大化。为了使MOP易于处理，使用了加权和方法将其转换为单目标优化问题（SOP），这使网络提供商可以动态调整权重因子以适应不同的EE和SE设计要求。为了解决变换后的SOP问题，提出了一种SUE分配算法来确定每个子信道的多个SUE，在此基础上，提出了一种用于SUE的功率比例因子确定算法和一种新颖的子信道功率分配算法。数值结果表明了该算法的快速收敛性，证明了我们的算法获得的EE和SE是Pareto最优解，优于传统的正交多址方案。 （C）2018 Elsevier B.V.保留所有权利。

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