智能反射面辅助的两跳中继无线供电通信网络吞吐量最大化研究

doi:10.11959/j.issn.1000-436x.2022182

摘要/Abstract

摘要：

为了提高基于中继的无线供电通信网络（WPCN）的能量和信息传输效率，提出了双智能反射面（IRS）辅助的两跳中继无线传输方案。其中，IRS₁和IRS₂分别放置在混合中继节点（HRN）与用户、HRN和基站（BS）之间，使BS和HRN、HRN和用户之间构成反射链路，从而提高HRN到用户的能量传输、用户到HRN的数据传输和HRN到BS的数据转发效率。为了最大化系统吞吐量，考虑了能量、数据传输和数据转发的时间调度、IRS的相位和用户的传输功率的联合优化问题。为了解决该非凸优化问题，提出了高效的交替优化算法，从而求得该问题的次优解。此外，分析了所提算法的收敛性和计算复杂度。仿真结果表明，IRS 能够有效提升基于中继的WPCN的吞吐量。此外，所提最优传输方案下的系统性能优于其他对照方案。

关键词: 智能反射面, 中继, 无线供电通信网络, 相移优化, 能量传输

Abstract:

To improve the energy and information transmission efficiency of relay-based wireless powered communication network (WPCN), a two intelligent reflecting surface (IRS) assisted dual-hop relay wireless transmission scheme was proposed.In particular, IRS₁ and IRS₂ were deployed between the base station (BS) and hybrid relay node (HRN), and between the HRN and users, respectively, which could improve the efficiency of energy transfer from the HRN to users, data transmission from users to the HRN and data forwarding from HRN to BS.To maximize the system throughput, an optimization problem was formulated, where the time scheduling of energy, information transmission and forwarding, the phase shifts of IRS, and the delivered power of users were jointly optimized.To address non-convexity of the formulated problem, an efficient alternating optimization algorithm was proposed and the sub-optimal solution was obtained.In addition, the convergence and computational complexity of the proposed algorithm were analyzed.Numerical results verify that IRS can effectively improve the throughput of WPCN based on relay.In addition, compared to the benchmark schemes, the proposed optimal transmission scheme can significantly improve the system performance in terms of throughput.

Key words: intelligent reflecting surface, relay, wireless powered communication network, phase shift optimization, energy transfer

中图分类号:

TN92

杨震, 冯璇, 吕斌. 智能反射面辅助的两跳中继无线供电通信网络吞吐量最大化研究[J]. 通信学报, 2022, 43(9): 90-99.

Zhen YANG, Xuan FENG, Bin LYU. Research on throughput maximization for intelligent reflecting surface assisted dual-hop relay wireless powered communication network[J]. Journal on Communications, 2022, 43(9): 90-99.

图/表 9

图1

图2

表1

仿真参数"

参数	含义	数值
K	用户数量	4
ρ	IRS反射效率系数	0.8
η	用户能量传输效率	0.8
$p_{f, k}$ /mW	用户能量传输饱和功率	5
$p_{c,}_{k}$ /mW	用户数据传输电路损耗系数	1
N₁	IRS₁反射单元数量	30
N₂	IRS₂反射单元数量	30
$δ_{h}^{2}$ /dBm	HRN处噪声功率	-90
$δ_{b}^{2}$ /dBm	BS处噪声功率	-90
$P_{h u}$ /dBm	HRN能量传输功率	40
$p_{h d}$ /dBm	HRN数据转发功率	40
ε	迭代结果允许的误差系数	10^-3
M	高斯随机的次数	200

表1

图3

图4

图5

图6

图7

图8

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