SWIPT-NOMA机会协作系统的优化方案

doi:10.11959/j.issn.1000-436x.2020109

通信学报 ›› 2020, Vol. 41 ›› Issue (8): 141-154.doi: 10.11959/j.issn.1000-436x.2020109

SWIPT-NOMA机会协作系统的优化方案

李陶深^1,²,宁倩丽¹,王哲³

¹ 广西大学计算机与电子信息学院，广西南宁 530004
² 南宁学院信息工程学院，广西南宁 530299
³ 广西民族大学人工智能学院，广西南宁 530005

修回日期:2020-04-28 出版日期:2020-08-25 发布日期:2020-09-05
作者简介:李陶深（1957- ），男，广西南宁人，博士，广西大学教授、博士生导师，主要研究方向为无线网络、无线携能通信、网络信息安全、大数据处理等|宁倩丽（1993- ），女，湖南邵东人，广西大学硕士生，主要研究方向为无线能量收集网络|王哲（1991- ），男，河南南阳人，博士，广西民族大学讲师，主要研究方向为能量收集网络、电力装备与智能信息技术
基金资助:
国家自然科学基金资助项目(61762010)

Optimization scheme for the SWIPT-NOMA opportunity cooperative system

Taoshen LI^1,²,Qianli NING¹,Zhe WANG³

¹ School of Computer,Electronics and Information,Guangxi University,Nanning 530004,China
² School of Information Engineering,Nanning University,Nanning 530299,China
³ School of Artifical Intelligent,Guangxi University for Nationalities,Nanning 530005,China

Revised:2020-04-28 Online:2020-08-25 Published:2020-09-05
Supported by:
The National Natural Science Foundation of China(61762010)

摘要/Abstract

摘要：

为提高无线携能通信（SWIPT）系统的频谱效率和性能，引入非正交多址接入（NOMA）技术构建SWIPT-NOMA 机会中继系统模型。针对固定信号功率分配会导致其与系统其他参数无法相互调节，继而影响系统中断概率和资源利用率等问题，提出了一种联合信号功率和时间分配方案，以提高系统中断性能。所提方案在满足信道状态较差节点速率的条件下，推导出信号功率分配的表达式，并得出系统中断概率的数学表达式，最后通过选取合适的时间分配参数来提升中断性能。仿真结果表明，所提系统模型具有比正交多址接入（OMA）系统更好的中断性能，所提优化方案可有效降低系统的中断概率，提高系统性能。

关键词: 非正交多址接入, 无线携能通信, 机会协作中继, 信号功率, 时间分配, 中断概率

Abstract:

In order to improve the spectrum efficiency and performance of the simultaneous wireless information and power transfer (SWIPT) system,the non-orthogonal multiple access (NOMA) technology was introduced to construct the SWIPT-NOMA opportunistic relay system model.The fixed signal power allocation couldn’t adjust with other parameters of the system,and then affect the outage probability and resource utilization of the system.Therefore,a joint signal power and time allocation scheme was proposed to improve the system outage performance.In the proposed scheme,the expression of signal power distribution was obtained under the condition of satisfying the quality of service (QoS) rate of the node with poor channel state,and then the relation between the interruption probability and the time distribution of the system was deduced,the time allocation parameter was adjusted to affect the outage probability.The simulation results show that the constructed NOMA system has better outage performance than orthogonal multiple access (OMA) system,and the proposed joint signal power and time allocation outage scheme can effectively reduce the interruption probability of the system and improve the system performance.

Key words: NOMA, SWITP, opportunity cooperative relay, signal power, time allocation, outage probability

中图分类号:

TP393

李陶深,宁倩丽,王哲. SWIPT-NOMA机会协作系统的优化方案[J]. 通信学报, 2020, 41(8): 141-154.

Taoshen LI,Qianli NING,Zhe WANG. Optimization scheme for the SWIPT-NOMA opportunity cooperative system[J]. Journal on Communications, 2020, 41(8): 141-154.

图/表 7

图1

图2

表1

仿真实验参数设置"

参数名称	参数值
中继节点个数N/个	3
能量转换效率η	0.7
x₁的目标信息速率 $R_{1}^{*} / (b i t \cdot s^{- 1})$	2.1
x₂的目标信息速率 $R_{2}^{*} / (b i t \cdot s^{- 1})$	2.6
S到R_k的距离d/m	1.2
S到R_k的路径损失因子α	1.2
R_k到D₁的距离d_k1/m	2.5
R_k到D₁的路径损失因子α_k1	3
R_k到D₂的距离d_k2/m	1.6
R_k到D₂的路径损失因子α_k2	2
噪声方差 $σ_{k 1}^{2}$ 、 $σ_{k 2}^{2}$ 、σ²	-24
传输功率P_s/dBm	20

表1

图3

图4

图5

图6

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SWIPT-NOMA机会协作系统的优化方案

Optimization scheme for the SWIPT-NOMA opportunity cooperative system

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