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基于SCMA中下行链路的比例因子功率分配方案 被引量:1

Scale-Factor Power Allocation Scheme Based on Downlink in SCMA
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摘要 针对稀疏码多址接入(SCMA:Spare Code Multiple Access)下行链路系统中经典的资源分配、子载波平均功率分配、基于最大通信容量和最大系统能效功率分配方案中系统总能效和容量不兼顾问题,提出了一种下行链路中基于比例因子控制的混合SCMA功率分配方案。其将系统的容量和能耗都作为主要方向进行优化,通过插入比例因子使系统能灵活调整倾向性。由于该问题是一个非凸优化问题,首先通过丁克尔巴赫理论(GDA:Generalized Dinkelbach’s Algorithm)将其转化为一个凸优化问题,然后选取合理的拉格朗日值采用KKT(Karush-Kuhn-Tucker)条件对模型进行迭代求解,最后通过调节比例因子使系统的能效及容量达到最优。理论计算分析和仿真结果表明,所提出的混合规律分配方案能有效提升下行链路系统的容量和能效。 Aimed at the shortcomings that the total energy efficiency and capacity of the system can not be considered at the same time of the classical resource allocation scheme,subcarrier average power allocation scheme and power allocation scheme based on maximum communication capacity and maximum system energy efficiency in SCMA(Sparse Code Multiple Access)downlink system,a hybrid SCMA power allocation scheme based on scale factor control in downlink is proposed.The capacity and energy consumption of the system are optimized as the main direction,and the system could flexibly adjust the tendency by inserting the scale factor.Since the problem is a nonconvex optimization problem,it is first transformed into a convex optimization problem by GDA(Generalized Dinkelbach’s Algorithm),and then the reasonable Lagrange value is selected to iteratively solve the model by used KKT(Karush-Kuhn-Tucker)conditions.Finally,the energy efficiency and capacity of the system are optimized by adjusted the scale factor.The theoretical analysis and simulation results show that the proposed hybrid law allocation scheme can effectively improve the downlink system capacity and energy efficiency compared with the traditional scheme.
作者 张光华 樊宗源 张琳 王晓昕 ZHANG Guanghua;FAN Zongyuan;ZHANG Lin;WANG Xiaoxin(School of Electrical Information and Engineering,Northeast Petroleum University,Daqing 163318,China)
出处 《吉林大学学报(信息科学版)》 CAS 2022年第4期539-545,共7页 Journal of Jilin University(Information Science Edition)
基金 东北石油大学培育基金资助项目(2019QNL-34)。
关键词 稀疏码多址技术 资源分配 功率分配 比例因子 sparse code multiple access(SCMA) resource allocation power distribution scale factor
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