SCMA网络中基于能量效率最大化的分层多播资源分配算法  

A Layered Multicast Resource Allocation Algorithm Based on Energy Efficiency Maximization for SCMA Networks

作　　者：陈雷[1] CHEN Lei(Dept.of Public Security Intelligence,Criminal Investigation Police Univ.of China,Shenyang 110035,China)

机构地区：[1]中国刑事警察学院公安情报学系

出　　处：《工程科学与技术》2019年第6期182-189,共8页Advanced Engineering Sciences

基　　金：辽宁省博士科研启动金项目(201601083);辽宁省自然科学基金项目(20180550046);中国刑事警察学院2019年重大项目培育计划资助项目(D2019001);中国刑事警察学院院级项目(D201703032)

摘　　要：稀疏码多址接入技术可以高效的提升频谱效率,因此被作为5G网络的候选接入技术之一。首先研究稀疏码多址接入网络中的分层多播策略,在该策略下使得网络容量不再受限于多播组中最差用户的信道质量。在满足多播组服务质量需求的同时,公式了网络能量效率最大化的最优化问题,该最优化问题由码本分配与功率分配联合解决。为了减少解决最优化问题的计算复杂度,提出分离码本分配与功率分配的快速次优化算法。最后,仿真结果显示提出的分层多播的快速次优化算法在基于稀疏码多址接入网络中的网络能量效率方面要优于采用传统多播策略的稀疏码多址接入网络,和基于正交频分多址网络。并且,提出的快速次优化算法在稀疏码多址接入网络中的多播系统功效要优于正交频分复用网络中的多播系统功效。As a candidate non-orthogonal multiple access technology for 5 G,the sparse code multiple access(SCMA)can effectively improve spectrum efficiency.In this paper,the layered multicast scheme in SCMA network was first studied,of which the system capacity is not limited by the worst channel quality user in the multicast group.Specifically,a network energy efficiency(EE)maximization problem subject to quality of service(QoS)requirements,codebook assignment,and power allocation was formulated.In order to reduce the computational complexity,a fast sub-optimization algorithm(FSA)by separating codebook assignment and power allocation was then proposed.Finally,the simulation results verified the network EE of the proposed algorithm significantly outperforms conventional multicast(CM)scheme in SCMA systems and orthogonal frequency division multiple access(OFDMA)systems.Moreover,the performance of SCMA systems with FSA is better than the performance of OFDMA systems with FSA.

关 键 词：稀疏码多址接入 分层多播 码本分配 功率分配 网络能量效率 

分 类 号：TN929.53[电子电信—通信与信息系统]