放大转发中继系统中基于SCMA的能效资源分配方案

doi:10.12305/j.issn.1001-506X.2022.06.32

Abstract

Abstract:

In the amplify-forward relay system, to content the goal of improving energy efficiency, a sub-carrier sequential pairing and a sparse code division multiple access (SCMA) codebook power joint resource allocation algorithm is proposed while ensuring the minimum rate requirements of each user. The energy efficiency resource allocation is modeled as a mixed integer optimization problem, and is divided into two independent sub-problems of sub-carrier pairing and codebook and power allocation. Firstly, the codebook and power allocation are presented, and the sub-carriers is paired based on energy efficiency.Then, in the case of fixed sub-carrier pairing, the optimal channel selection allocation method based on the energy efficiency codebook is used to transform the power problem into a concave function which contains important parameters. The concave function can be solved by Lagrangian function iteratively. Finally, codebook and power alternate iterative optimization until convergence. Simulation results show that the proposed algorithm can improve the average energy efficiency of the system by about 29% compared with other schemes, while also ensuring the minimum speed requirement of each user.

Key words: sparse code multiple access (SCMA), energy efficiency, amplify-forward relay, resource allocation

CLC Number:

TN929.5

Bozhi DONG, Jiang ZHU, Haibo ZHANG. SCMA-based energy efficiency resource allocation scheme in amplify-forward relay system[J]. Systems Engineering and Electronics, 2022, 44(6): 2035-2042.

Figures/Tables 9

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参数名称	参数值
小区半径/m	500
正交子载波数目N	4
正交子载波带宽/kHz	200
SCMA码本数目J	6
码本非零元数目L	2
SCMA移动用户数	6
路径损耗模型	128.1+37.6lg(R)
用户设备发射功率上限/dBm	30
中继设备发射功率上限/dBm	33
噪声功率谱密度/(dBm/Hz)	-58
优化误差φ	10^-5
P_min/W	0.02
R_min/(bit/s/Hz)	8

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SCMA-based energy efficiency resource allocation scheme in amplify-forward relay system

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