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

Abstract

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

CLC Number:

TN92

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.

Figures/Tables 9

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

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