Trade-off between energy efficiency and spectrum efficiency for decode-and-forward full-duplex relay network

doi:10.11772/j.issn.1001-9081.2022091414

Abstract

Abstract:

In order to optimize the Energy Efficiency （EE） and Spectrum Efficiency （SE） of Decode-and-Forward （DF） full-duplex relay network， a trade-off method of EE and SE for DF full-duplex relay network was proposed. In full-duplex relay network， firstly， the EE of the network was optimized with the goal of improving the SE of the network. And the optimal power of the relay was obtained by combining the derivation and the Newton-Raphson method， then the Pareto optimal set of the objective function was given. Secondly， a trade-off factor was introduced through the weighted scalar method， a trade-off optimization function of EE and SE was constructed， and the multi-objective optimization problem of EE optimization and SE optimization was transformed into a single-objective energy-spectrum efficiency optimization problem by using normalization. At the same time， the performance of EE， SE and trade-off optimization under different trade-off factor was analyzed. Simulation results show that the SE and EE of the proposed method are higher at the same data transmission rate compared with the those of the full-duplex-optimal power method and the half-duplex-optimal relay-optimal power allocation method. By adjusting different trade-off factors， the optimal trade-off and the optimization of EE and SE can be achieved.

Key words: full-duplex, Decode-and-Forward (DF), Energy Efficiency (EE), Spectrum Efficiency (SE), trade-off factor

摘要：

为优化解码转发（DF）全双工中继网络的能量效率（EE）与频谱效率（SE），提出一种DF全双工中继网络的EE和SE的均衡方法。在全双工中继网络中，首先，以提高网络的SE为目标来优化网络的EE，并结合求导和牛顿?拉弗森方法得到中继的最优功率，进而给出目标函数的帕累托最优集；然后，通过加权标量法引入均衡因子，构建一个EE和SE的折中优化函数，通过归一化将EE最优化和SE最优化这一多目标优化问题转化为单目标的能量?频谱效率的优化问题，并分析不同均衡因子下的EE、SE和折中优化的性能。仿真实验结果表明，相较于全双工?最优功率方法、半双工?最佳中继最优功率分配方法，所提方法的SE和EE在相同数据传输速率下更高；通过调整不同均衡因子，可以实现EE和SE的最优均衡与优化。

关键词: 全双工, 解码转发, 能量效率, 频谱效率, 均衡因子

CLC Number:

TN925

Qian ZHANG, Runhe QIU. Trade-off between energy efficiency and spectrum efficiency for decode-and-forward full-duplex relay network[J]. Journal of Computer Applications, 2023, 43(10): 3188-3194.

张茜, 仇润鹤. 解码转发全双工中继网络的能效谱效均衡[J]. 《计算机应用》唯一官方网站, 2023, 43(10): 3188-3194.

Figures/Tables 7

Fig. 1 Decode-and-forward full-duplex relay network model

Tab. 1 Simulation parameters

参数	取值
源节点与目的节点的距离d	1
源节点与中继节点的距离 $d S R$	（0，1）
非理想功率放大因子 $ε$	2.875
信道衰落因子v	2.5
信道带宽W/Hz	1
各节点发射功率上限/W	0.875
残余自干扰功率 $σ r 2$ /W	0.05
频谱效率下限 $r m i n$ /（ $b i t · s - 1 · H z - 1$ ）	0.2
电路功率 $P C$ /W	1.2
自干扰消除功率 $P S I C$ /W	0.1
噪声功率 $σ 2$ /W	1

Tab. 1 Simulation parameters

参数	取值
源节点与目的节点的距离d	1
源节点与中继节点的距离 $d S R$	（0，1）
非理想功率放大因子 $ε$	2.875
信道衰落因子v	2.5
信道带宽W/Hz	1
各节点发射功率上限/W	0.875
残余自干扰功率 $σ r 2$ /W	0.05
频谱效率下限 $r m i n$ /（ $b i t · s - 1 · H z - 1$ ）	0.2
电路功率 $P C$ /W	1.2
自干扰消除功率 $P S I C$ /W	0.1
噪声功率 $σ 2$ /W	1

Fig. 2 EE-SE trade-off under DT， HD and FD transmission models

Fig. 3 EE-SE trade-off at different relay distances

Fig. 4 Relationship between SE， EE and SNR under different schemes

Fig. 5 Optimal transmission power under different trade-off factor

Fig. 6 EE， SE and EE-SE under different trade-off factor

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