协作通信中多用户调度策略的研究

发布时间：2018-07-28 17:05

【摘要】：随着现代无线通信技术的飞速发展,人们对通信技术的要求越来越高。在信息量巨大的时代里,保证信息稳定而高速的传输是十分必要的。因此好的通信模式及调度算法为人们所迫切需要。本文研究的协作通信系统是一种覆盖范围广,由多个拥有独立天线的无线节点相互协作的通信系统。协作通信系统将所有发送和接收信息作为一个整体来处理,在信息传递过程中利用信道衰落特性而非消除信道之间的衰落来获得增益,而所有实现多用户增益的途径则是通过调度来实现。为了更好的提升系统的通信能力,保证用户的服务质量(Quality of Service,Qo S),本文重点研究应用于多用户协作通信系统中的调度算法。在考虑过时现象的影响下,通过建立多用户协作通信模型对调度算法进行仿真实验,分析信道容量,误码率和用户资源分配的公平性,以评估所采用调度算法的优劣。本文再进一步基于经典调度算法所能发挥的调度性能,对比例公平算法进行改进。考虑到系统反馈时延所带来的影响,我们加入时延因子,使改进调度算法具有持续调度性能,可以在调度过程中持续地利用性能更好的链路。并通过对比仿真实验验证了改进算法能更适用于多用户协作通信系统,更能保证用户的Qo S,提高公平性。
[Abstract]:With the rapid development of modern wireless communication technology, people are demanding more and more communication technology. In the era of huge amount of information, it is necessary to ensure the stable and high speed transmission of information. Therefore, good communication modes and scheduling algorithms are urgently needed. The cooperative communication system studied in this paper is a kind of communication system with a wide coverage and multiple wireless nodes with independent antennas. Cooperative communication systems process all the transmitted and received information as a whole and gain by utilizing channel fading characteristics rather than eliminating inter-channel fading in the process of information transmission. All the ways to achieve multiuser gain are achieved by scheduling. In order to improve the communication ability of the system and ensure the quality of service (QoS) of users (Quality of Service QoS S), this paper focuses on the scheduling algorithm applied to multi-user cooperative communication systems. Considering the influence of time-lapse, the scheduling algorithm is simulated by establishing a multi-user cooperative communication model, and the channel capacity, bit error rate and fairness of user resource allocation are analyzed to evaluate the advantages and disadvantages of the proposed scheduling algorithm. Based on the scheduling performance of classical scheduling algorithm, the proportional fairness algorithm is improved in this paper. Considering the influence of system feedback delay, we add delay factor to make the improved scheduling algorithm have continuous scheduling performance and can continuously utilize better links during scheduling process. The simulation results show that the improved algorithm is more suitable for multi-user cooperative communication systems and can ensure the QoS of users and improve fairness.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN92

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