Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (8): 2370-2377.doi: 10.13229/j.cnki.jdxbgxb.20221267

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Power allocation scheme for non-orthogonal multiple access system based on system energy efficiency maximization

Pu YANG(),Qing-yue QU,Yi-fei SHEN,Yi LIU()   

  1. State Key Laboratory of Integrated Service Network,Xidian University,Xi'an 710071,China
  • Received:2022-09-28 Online:2024-08-01 Published:2024-08-30
  • Contact: Yi LIU E-mail:yangp@stu.xidian.edu.cn;yliu@xidian.edu.cn

Abstract:

In order to improve energy efficiency and reduce power consumption, a non-orthogonal multiple access (NOMA) power allocation algorithm based on system energy efficiency maximization is proposed for NOMA systems in cellular networks. The multi-user NOMA power distribution problem is transformed into system capacity maximization problem by analyzing the mathematical model under certain conditions. When the conditions are not satisfied, the subgradient method and obstacle function method are used to solve the problem. Simulation results show that the proposed algorithm has significant performance improvement compared with existing methods.

Key words: communication and information system, non-orthogonal multiple access system, energy efficiency maximization, power distribution, Dinkelbach algorithm

CLC Number: 

  • TN92

Table 1

Simulation parameters"

仿真参数参数值
基站最大发送功率PTotal/dBm46
基站固定功率损耗PC/dBm30
小区半径/m500
用户距基站的最小距离/m20
用户分布方式均匀分布
系统带宽W/MHz5
用户数量N[5 : 5 : 50]
用户组上限Umax246
大尺度衰落Lk,m/dB128.1+37.6lg(dk,m)
小尺度衰落Lsgk2/2.64
噪声功率谱密度 dBm·Hz-1-174
用户最小速率需求Rmin/Mbps[0.25, 0.5,…, 5]
丁克尔巴赫算法容许误差ξ1×10-6
次梯度法收敛阈值1×10-3
次梯度法初始拉格朗日乘子ε(0)1
次梯度法步长τ1×10-3
障碍函数法搜索参数a0.1
障碍函数法搜索参数b0.8
乘比例系数c10
近似精度参数t2
牛顿法收敛阈值πin1×10-3
障碍函数法收敛阈值πout1×10-3

Fig.1

Average minimum power of the base station varies with Rmin( N = 10 )"

Fig.2

Average minimum power of the base station varies with Rmin( N = 20 )"

Fig.3

Average energy efficiency of the system varies with N(Rmin=1.5?Mbps)"

Fig.4

Average energy efficiency of the system varies with N(Rmin=3.5?Mbps)"

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