Energy Efficiency Optimization for NOMA With SWIPT
Energy Efficiency Optimization for NOMA With SWIPT
复制标题
通过 SWIPT 对 NOMA 进行能效优化
DOI：
10.1109/jstsp.2019.2898114
复制
发表时间：
2019-06-01
影响因子：
7.5
通讯作者：
Chambers, Jonathon A.
中科院分区：
文献类型：
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作者：
Tang, Jie;Luo, Jingci;Chambers, Jonathon A.
同时无线信息和功率传输（SWIPT）和非正交多址（NOMA）的组合是提高即将到来的第五代（5G）网络的频谱效率和能量效率（EE）的潜在解决方案，特别是为了支持物联网（IoT）和大规模机器类型通信（mMTC）场景的功能。在本文中，我们研究联合功率分配和时间切换（TS）控制EE优化在TS为基础的SWIPT NOMA系统。我们的目标是优化系统的EE，同时满足最大发射功率预算，最小数据速率和最小收获每个终端的能量的约束。所考虑的EE优化问题既不是线性的，也不是凸的，涉及联合优化的功率分配和时间切换因素，因此，是非常难以直接解决。为了解决这个问题，我们开发了一个双层算法，其中Dinkelbach方法采用在内层优化功率分配和外层控制时间切换分配。此外，一个简化的，但实际的特殊情况下，在所有终端具有相等的时间开关因子。数值结果验证了理论研究结果，并表明，显着的性能增益超过正交多址方案在EE方面可以实现所提出的算法在SWIPT启用NOMA系统。
The combination of simultaneous wireless information and power transfer (SWIPT) and non-orthogonal multiple access (NOMA) is a potential solution to improve spectral efficiency 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 scheme in terms of EE can be achieved by the proposed algorithms in a SWIPT-enabled NOMA system.