基于能效最大的无线供电反向散射网络资源分配算法

doi:10.11959/j.issn.1000-436x.2020132

Abstract

Abstract:

In order to alleviate the energy consumption problem caused by the increasing number of Internet of things (IoT) nodes,an energy-efficient (EE) maximization based resource allocation algorithm was proposed for multi-carrier wireless-powered backscatter communication network.Firstly,a multivariable and nonlinear resource allocation model was formulated to jointly optimize transmit power,transmission time,reflection coefficient,and energy-harvesting allocation coefficient,where the maximum transmit power constraint of the power station and the minimum harvested energy constraint at the backscatter device were considered.Then,the original non-convex optimization problem was transformed into a convex one which was solved by using Dinkelbach’s method and the variable substitution approach.Furthermore,the analytical solution of the resource allocation problem was obtained based on Lagrange dual theory.Simulation results verify that the proposed algorithm has better EE by comparing it with the existing algorithm under pure backscatter mode and algorithm under the harvested-then-transmit mode.

Key words: multi-carrier communication, wireless-powered backscatter communication, resource allocation

CLC Number:

TN918.82

Yongjun XU,Bowen GU,Qianbin CHEN,Jinzhao LIN. Energy efficiency maximization resource allocation algorithm in wireless-powered backscatter communication network[J]. Journal on Communications, 2020, 41(10): 202-210.

Figures/Tables 7

参数	含义
θ	反射系数
T_slot	系统传输时隙
R _bc	反射数据速率
τ _eh	能量收集时间
K	子载波的个数
T _bc	反向散射传输时间
ρ	收集能量分配系数
P_max	基站最大发射功率
p_e	反向散射设备接收端电路消耗功率
$h_{k}^{p b}$	基站到反向散射设备子载波k上的信道增益
$p_{k}^{p b}$	基站到反向散射设备子载波k上的发射功率
η_E	系统能效
R _td	数据传输速率
E _eh	设备收集能量
κ	能量转化效率
T _td	数据传输时间
η	能量收集的效率
σ_k	子载波k上的背景噪声功率
p_d	反向散射设备发射端电路消耗功率
$h_{k}^{b r}$	反向散射设备到接收器子载波k上的信道增益
$h_{k}^{b r}$	反向散射设备到接收器子载波k上的传输功率

References 18

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参数	参数值
κ	0.6
η	0.6
K	3
T_slot/s	1
p_d /mW	0.01
p_e/mW	0.1
σ _n /W	1×10^{- 10}
P_max/W	1

Energy efficiency maximization resource allocation algorithm in wireless-powered backscatter communication network

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