动态频谱接入系统策略设计与优化

发布时间：2018-03-23 01:25

本文选题：动态频谱接入策略　切入点：认知无线电　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：动态频谱接入是解决频谱资源稀缺与频谱资源利用率低等问题的有效解决方案,其基本思想是:次级用户(非授权用户)在不对主用户(授权用户)造成干扰的前提下,通过一定的策略动态接入未被主用户占用的频谱资源,从而达到提高频谱利用率、缓解频谱资源稀缺的目的。动态频谱接入策略定义了次级用户与主用户系统动态使用频谱资源的规范和方法,是系统实现中的重要部分。已有研究多是在给定动态频谱接入策略的前提下,对次级用户的感知、资源分配等问题进行优化,而忽略了对接入策略本身的优化。本文通过对已有动态频谱接入策略的研究和归纳的基础上,着重研究了动态频谱接入策略的设计和优化问题,以期提出能够适应网络动态变化、进一步提升频谱利用率的新型动态频谱接入策略。本文对动态频谱接入系统的策略设计进行了重点研究。首先对动态频谱接入技术的目的和意义进行了阐述,并对国内外动态频谱接入技术的研究、发展现状进行了总结分析。然后介绍了在对动态频谱共享策略进行建模分析时所用到的连续时间马尔可夫链和排队论方法,以及当前三种典型的动态频谱接入策略:随机抢先式接入RP-DSA策略、协作式接入CP-DSA策略以及次级用户受限接入LA-DSA策略,并分析这三种策略的利弊。接着,在现有的三种典型动态频谱接入策略的基础上,提出了一种基于认知无线电的多策略动态频谱接入方案,该方案通过对RP-DSA、CP-DSA以及LA-DSA进行合理并用和联合优化,达到系统灵活性更强的目的。在此基础上,通过对信道分配和感知过程中的虚警概率选择,进一步优化系统性能。最后,采用了不需要感知过程及频谱切换能力的基于信道重新排序机制的接入策略,并基于此提出了两种优化方案来增加系统灵活性。在保证主用户通信的同时,避免了不必要的掉话和阻塞。
[Abstract]:Dynamic spectrum access is an effective solution to the problems of scarcity of spectrum resources and low utilization of spectrum resources. Its basic idea is that secondary users (unauthorized users) do not interfere with primary users (authorized users). Through a certain strategy to dynamically access the spectrum resources that are not occupied by the primary users, the spectrum efficiency can be improved. The purpose of reducing the scarcity of spectrum resources. The dynamic spectrum access policy defines the specifications and methods for the dynamic use of spectrum resources in secondary and primary user systems. It is an important part of the system implementation. Most of the previous studies have optimized the perception and resource allocation of secondary users on the premise of a given dynamic spectrum access strategy. Based on the research and induction of the existing dynamic spectrum access strategy, this paper focuses on the design and optimization of the dynamic spectrum access strategy. In order to be able to adapt to the dynamic changes of the network, This paper focuses on the design of dynamic spectrum access system. Firstly, the purpose and significance of dynamic spectrum access technology are described. The research and development status of dynamic spectrum access technology at home and abroad are summarized and analyzed. Then the continuous time Markov chain and queuing theory method used in modeling and analyzing dynamic spectrum sharing strategy are introduced. And three typical dynamic spectrum access strategies: random preemptive access RP-DSA strategy, cooperative access CP-DSA strategy and secondary user restricted access LA-DSA strategy, and the advantages and disadvantages of these three strategies are analyzed. On the basis of three typical dynamic spectrum access strategies, a multi-strategy dynamic spectrum access scheme based on cognitive radio is proposed. The scheme is optimized by rational use and joint optimization of RP-DSAN CP-DSA and LA-DSA. On the basis of this, the system performance is further optimized by selecting false alarm probability during channel allocation and perception. The access strategy based on channel reordering mechanism is adopted, which does not require perceptual process and spectrum switching ability. Based on this, two optimization schemes are proposed to increase the flexibility of the system. At the same time, the communication between the primary users and the primary users is guaranteed. Avoid unnecessary calls and blockages.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN915.6

【相似文献】