多点协作OFDM系统资源分配技术研究

发布时间：2018-05-15 19:05

本文选题：无线资源管理 + OFDM　；参考：《南京邮电大学》2014年硕士论文

【摘要】：当今无线网络资源日益稀缺的环境下,为了支持未来无线网络的更高传输速率、更可靠的服务保证以及更丰富的多媒体业务,需要更高效的无线资源管理。如何提高无线网络资源的分配效率以满足日益增长的速率要求是当前无线通信领域的热点研究课题。本文主要对OFDM网络中的资源分配算法进行了研究。首先,阐述了课题研究的背景。随后,对影响无线信道的因素、OFDM信道以及效用函数等基础理论进行了简要介绍。其次,本文对单小区OFDM系统中的资源分配算法进行了研究。OFDM系统中的资源分配算法通常以子载波分配为核心进行设计。这些算法主要分为两种类型,第一种类型：先进行初始化的资源分配(确定要分配的子载波数量和分配给每个用户的功率大小),然后在进行子载波的分配。第二种类型：先确定子载波的分配,然后在进行功率分配。本文主要关注后一种类型,并对该类型的两种算法：‘'FIND-ROOT"算法和“LINE”算法进行了研究。通过仿真分析可知,两种算法都解决了速率自适应资源分配问题,但后者在计算复杂度和系统容量方面都要优于前者。最后,本文研究了混合业务下OFDM-CoMP系统中的资源分配,对基于效用的集中式联合资源分配算法、基于效用的分布式联合资源分配算法以及无功率控制的联合比例公平调度算法进行了仿真分析。仿真结果表明,在吞吐量、效用和、丢包率以及中断率方面,与联合比例公平调度算法相比,基于效用的两种算法能获得更理想的结果。然而,上述3种算法对功率的分配采用的都是等功率分配算法,功率利用率较低。因此,本文提出了一种基于注水功率分配的算法来代替等功率分配算法。仿真结果表明改进后的算法在吞吐量和效用和方面有大幅的提升。此外,本文还提出了一种O FDM网络中基于注水功率的资源分配方案。
[Abstract]:Nowadays, in the environment of increasingly scarce wireless network resources, in order to support the higher transmission rate, more reliable service guarantee and richer multimedia services, more efficient wireless resource management is needed to support the future wireless network. How to improve the efficiency of the distribution of wireless network resources to meet the increasing rate is the current wireless communication. This paper focuses on the research of resource allocation algorithms in OFDM networks. First, the background of the research is expounded. Then, the basic theories of the factors affecting the wireless channel, the OFDM channel and the utility function are briefly introduced. Secondly, the resource allocation algorithm in the single cell OFDM system is carried out in this paper. The resource allocation algorithm in the.OFDM system is usually designed with subcarrier allocation. These algorithms are divided into two types. The first type is the first type of resource allocation (the number of subcarriers to be assigned and the power assigned to each user), and then the second types of subcarriers. Type: first determine the distribution of subcarriers and then carry out power allocation. This paper focuses on the latter type and studies the two algorithms of this type: the ''FIND-ROOT' algorithm and the "LINE" algorithm. Through the simulation analysis, the two algorithms have solved the problem of rate self-adaptive resource allocation, but the latter is calculated for the complexity and the complexity of the algorithm. The system capacity is better than the former. Finally, this paper studies the resource allocation in the OFDM-CoMP system under the mixed service. The utility based centralized joint resource allocation algorithm, the utility based distributed joint resource allocation algorithm and the joint proportional fairness modulation algorithm without power control are simulated and analyzed. Compared with the joint proportional fair scheduling algorithm, the utility based two algorithms can achieve better results in terms of throughput, utility, packet loss rate and interruption rate. However, the power allocation algorithm for the above 3 algorithms is equal to the equal power allocation algorithm, and the power utilization rate is low. Therefore, this paper proposes a kind of water injection power based on the power allocation algorithm. The allocation algorithm is used to replace the equal power allocation algorithm. The simulation results show that the improved algorithm has a significant improvement in throughput, utility and efficiency. In addition, this paper also proposes a resource allocation scheme based on water injection power in O FDM network.

【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.53

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