MC-NOMA增强型反向散射网络中的谱能效率均衡优化

doi:10.12305/j.issn.1001-506X.2022.02.36

摘要/Abstract

摘要：

环境信号的不确定性导致不可预测的谱能机会。传输机会和能源供应的缺乏给反向散射通信网络的多址接入设计带来了极大的挑战。本文针对多载波非正交多址接入(multicarrier non-orthogonal multiple access, MC-NOMA)增强型反向散射网络, 提出了一种分阶段优化算法实现均衡调控下的谱能效率最大化, 该问题是非凸的且难以求解。因此, 首先将该问题分解成子载波分配和反射系数优化两个子问题, 然后基于Gale-Shapley匹配原理提出多对一稳定匹配算法求解最佳的子载波分配, 最后利用凸优化理论求反射系数优化。仿真结果表明, 与动态MC-NOMA方案(dynamic MC-NOMA, D-NOMA)和正交多址接入方案(orthogonal multiple access, OMA)相比, 所提优化方案在谱效和能效上均有显著的提升。

关键词: 频谱效率, 能效, 多载波非正交多址接入, 反向散射通信

Abstract:

The nondeterministic nature of ambient signals results in unpredictable spectrum and energy opportunities. The shortage of transmission opportunities and energy supply brings a great challenge in designing the multiple access scheme in backscatter communication networks. A phased optimization algorithm is proposed to maximize the balanced spectrum and energy efficiency for the multicarrier non-orthogonal multiple access (MC-NOMA) enhanced backscatter networks. However, the formulated problem is non-convex, which is computationally difficult to solve. Hence, the optimization problem is further divided into two sub-problems, i.e. the subcarrier allocation and the reflection coefficient optimization. Based on the Gale-Shapley matching theory, a many-to-one matching algorithm is proposed to obtain the optimal subcarrier allocation. Then, the reflection coefficient optimization is solved with the convex optimization theory. The simulation results show that the spectrum and energy efficiency can be significantly improved by the proposed optimization scheme, compared to the dynamic MC-NOMA scheme (D-NOMA) and the orthogonal multiple access scheme (OMA).

Key words: spectrum efficiency, energy efficiency, multicarrier non-orthogonal multiple access (MC-NOMA), backscatter communication

中图分类号:

TN929.5

李兰花, 黄晓霞. MC-NOMA增强型反向散射网络中的谱能效率均衡优化[J]. 系统工程与电子技术, 2022, 44(2): 651-661.

Lanhua LI, Xiaoxia HUANG. Spectrum and energy efficiency tradeoff in MC-NOMA enhanced backscatter networks[J]. Systems Engineering and Electronics, 2022, 44(2): 651-661.

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参数	设定值
设备分布范围	100 m×100 m
BD数N	[10, 50]
子载波数M	{10, 20, 50}
子载波带宽B_c/kHz	100
AT电路能耗P_c/mW	40^[14]
BT能耗P_b/μW	0.25^[9]
路径损耗系数α	3^[57]
高斯噪声功率密度/(dBm/Hz)	-174

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