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

系统工程与电子技术 ›› 2022, Vol. 44 ›› Issue (6): 2035-2042.doi: 10.12305/j.issn.1001-506X.2022.06.32

放大转发中继系统中基于SCMA的能效资源分配方案

董博志^1,^2,^3,*, 朱江^1,^2,³, 张海波^1,^2,³

1. 重庆邮电大学通信与信息工程学院, 重庆 400065
2. 移动通信教育部工程研究中心, 重庆 400065
3. 移动通信技术重庆市重点实验室, 重庆 400065

收稿日期:2021-03-12 出版日期:2022-05-30 发布日期:2022-05-30
通讯作者: 董博志
作者简介:董博志 (1995—), 男, 硕士研究生, 主要研究方向为无线资源分配技术|朱江 (1977—), 男, 教授, 博士, 主要研究方向为通信理论与技术、信息安全技术|张海波 (1979—), 男, 副教授, 博士, 主要研究方向为新型网络技术、无线资源管理
基金资助:
国家自然科学基金(61771084);重庆市科委自然科学基金(KJQN201800834)

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

Bozhi DONG^1,^2,^3,*, Jiang ZHU^1,^2,³, Haibo ZHANG^1,^2,³

1. School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications, Chongqing 400065, China
2. Engineering Research Center of Mobile Communications of the Ministry of Education, Chongqing 400065, China
3. Chongqing Key Laboratory of Mobile Communications Technology, Chongqing 400065, China

Received:2021-03-12 Online:2022-05-30 Published:2022-05-30
Contact: Bozhi DONG

摘要/Abstract

摘要：

放大转发中继系统中, 以提升能效为目标, 在保障各用户的最小速率需求下, 提出一种子载波顺序配对以及稀疏码分多址(sparse code division multiple access, SCMA)码本功率联合资源分配算法。将能效资源分配建模为一个混合型整数优化问题, 并将其拆分为子载波配对和码本及功率分配两个独立的子问题。首先, 预设码本和功率分配, 基于能效对子载波进行配对。然后, 在子载波固定配对的情况下, 基于能效码本采用最优信道选择的分配方法, 功率问题转化为含有参量的凹函数, 构建拉格朗日函数进行迭代求解。最后，码本和功率交替迭代优化直至收敛。仿真表明, 所提算法较其他方案可以提升约29%的系统平均能效, 同时也保证了每个用户的最小速率需求。

关键词: 稀疏码多址接入, 能量效率, 放大转发中继, 资源分配

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

中图分类号:

TN929.5

董博志, 朱江, 张海波. 放大转发中继系统中基于SCMA的能效资源分配方案[J]. 系统工程与电子技术, 2022, 44(6): 2035-2042.

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.

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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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放大转发中继系统中基于SCMA的能效资源分配方案

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

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