认知无线电动态频谱的分配和接入问题研究

发布时间：2018-10-04 20:06

【摘要】：网络信息化和技术化推动下,无线通信技术不断发展,对通信业务的需求日益增长,现有技术约束下,频谱资源日益紧张,这也成为无线通信业务发展的桎梏。在现有频谱资源基础上,如何动态、高效地提高频谱的二次利用成为人们关注的焦点。认知无线电在提高频谱资源利用率方面的优势,成为缓解频谱资源紧张的主要渠道之一。通过认知无线电的频谱分配可缓解频谱资源的紧张,提高资源利用效率,从而改善整个认知无线电系统的性能。有效利用频谱、缓解频谱资源的紧张,提高系统效用,是认知无线电的关键技术,对改善认知无线电系统的性能起着关键性的作用。本文基于频谱资源分配和使用的相关理论,研究认知无线电动态频谱的分配和接入问题。具体分析中,首先对认知无线电及动态频谱的分配和接入问题进行系统描述,归纳几种经典的频谱分配模型和接入算法；然后根据我国城市无线电频谱资源分配现状和存在的主要问题,结合强化学习理论提出动态频谱分配的具体方案,并进行相应的仿真；最后根据频谱接入关键技术,进一步利用Q学习方法对动态频谱接入进行优化设计和计算。本文的研究表明,一方面,认知无线电的应用可在一定程度上提高信道的使用率,从而缓解有限频谱资源带来的通信压力；另一方面,频谱分配方案和接入技术的关键在于减少CR用户与主用户之间的冲突,提高CR用户的有效信息支付率,改善CR用户的服务质量,从而有效提升系统性能,故需要权衡实际需求来选择不同的频谱分配方案和接入方法。
[Abstract]:With the promotion of network information and technology, wireless communication technology continues to develop, and the demand for communication services is growing day by day. Under the constraints of existing technology, the spectrum resources are increasingly tight, which has become the shackles of the development of wireless communication services. Based on the existing spectrum resources, how to improve the secondary utilization of spectrum dynamically and efficiently has become the focus of attention. Cognitive radio is one of the main channels to alleviate the shortage of spectrum resources because of its advantages in improving the efficiency of spectrum resources. The spectrum allocation of cognitive radio can alleviate the shortage of spectrum resources, improve the efficiency of resource utilization, and improve the performance of the whole cognitive radio system. It is the key technology of cognitive radio to use spectrum effectively, to alleviate the shortage of spectrum resources and to improve the system utility. It plays a key role in improving the performance of cognitive radio system. Based on the theory of spectrum resource allocation and utilization, this paper studies the dynamic spectrum allocation and access of cognitive radio. In the specific analysis, firstly, the problem of cognitive radio and dynamic spectrum allocation and access is systematically described, and several classical spectrum allocation models and access algorithms are summarized. Then according to the current situation and main problems of urban radio spectrum resource allocation in our country, combined with reinforcement learning theory, the specific scheme of dynamic spectrum allocation is put forward, and the corresponding simulation is carried out. Finally, according to the key technology of spectrum access, Furthermore, the Q learning method is used to optimize the design and calculation of dynamic spectrum access. The research in this paper shows that, on the one hand, the application of cognitive radio can improve the channel utilization to a certain extent, thereby alleviating the communication pressure caused by limited spectrum resources; on the other hand, The key of spectrum allocation and access technology is to reduce the conflicts between CR users and primary users, to improve the effective information payment rate of CR users, and to improve the quality of service of CR users, so as to effectively improve the system performance. Therefore, it is necessary to choose different spectrum allocation schemes and access methods.
【学位授予单位】：广西大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN925

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