应用于MIMO-OFDMA下行链路的分组调度算法

发布时间：2018-04-01 09:27

本文选题：多输入多输出　切入点：正交频分多址　出处：《北京航空航天大学学报》2014年10期

【摘要】：提出了一种基于效用函数的应用于多输入多输出正交频分复用接入(MIMO-OFDMA,Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing Access)系统下行链路的分组调度算法.该算法在调度时不仅考虑物理层的信道状况,还利用基站发送缓冲区的状态信息和用户反馈回来的ARQ(Automatic Repeat-request)信息来帮助基站做出调度决策.针对系统中多种业务的不同服务质量(QoS,Quality of Service)要求,分别设计了其效用函数,并将调度决策问题转化成一个系统总效用函数值最大化问题.同时考虑到实际的长期演进计划(LTE,Long Term Evolution)系统中对子载波共享的限制条件,提出了一种可以降低实际复杂度的启发式算法用于求解该最优化问题.仿真结果表明,该算法不但在保证实时业务用户QoS要求方面要好于传统的调度算法,还能获得较好的系统总容量和丢包率性能.
[Abstract]:This paper presents a packet scheduling algorithm based on utility function for multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing access (MIMO-OFDMA) access systems.The algorithm not only considers the channel condition of physical layer, but also makes use of the state information of buffer sent by base station and the ARQ(Automatic repeat request information returned by user to help the base station to make scheduling decision.According to the QoS quality of Service (QoS of Service) requirements of various services in the system, the utility function is designed, and the scheduling decision problem is transformed into a maximization problem of the total utility function of the system.Considering the limitation of subcarrier sharing in long term Term evolution system, a heuristic algorithm is proposed to solve the optimization problem.The simulation results show that the proposed algorithm is not only better than the traditional scheduling algorithm in ensuring the QoS requirements of real-time service users, but also can achieve better performance of total system capacity and packet loss rate.
【作者单位】：北京邮电大学泛网无线通信教育部重点实验室;
【基金】：北京高等学校青年英才计划资助项目(YETP0432) 国家863计划资助项目(2012AA01A508) 国家青年科学基金资助项目(61302080)
【分类号】：TN919.3

【共引文献】