基于优先级队列的协作认知频谱共享

发布时间：2018-01-13 00:03

本文关键词：基于优先级队列的协作认知频谱共享　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着无线通信需求的高速增长,频谱资源的稀缺与实际频谱固定分配机制造成的频谱总体利用率偏低之间的矛盾成为制约未来移动通信快速发展的瓶颈。认知无线电(Cognitive Radio,CR)技术能主动感知无线通信环境,动态地接入未被主用户(Primary User,PU)使用的空闲频段,为解决上述矛盾开辟了一条崭新的途径。然而,频谱资源的动态性和复杂性为CR系统的设计实现带来了挑战。本文针对协作认知无线网络(CCRN)提出了一种基于优先级队列的两级中心协作频谱共享方案(PQTL-CSS)。通过招募认知用户作为中继,协助完成授权通信,并将传统的数据协作拓展至管理协作,由协作认知节点协调其它认知节点的接入,形成由主用户和协作认知节点构成的两级中心管理结构。在保障主用户最高优先级的同时,作为对认知节点协助授权业务传输的回报,赋予其高于非协作认知节点的信道接入权限。所提机制可以很好的解决协作认知节点与非协作认知节点的资源分配问题,以及在业务随机性较强的情况下实现多种类型节点的动态、高效频谱共享。协议研究了协作认知无线网络中不同类型用户的数据传输,提出一种基于请求许可差的接入协议;考虑了网络拓扑和通信过程的动态特性对系统的影响,主用户可周期性地发起中继选择过程对信道进行检测,能够根据网络状况对认知中继节点进行更新,这样可以在网络拓扑结构以及通信过程发生变化时,通过协作认知用户的更新保证较好的数据传输性能。接下来,论文将设计的协议应用到了认知战术网络,并针对该网络的特点对协议进行了相应的修改。论文对不同类型用户的时延性能进行了理论分析与数值仿真,并对不同类型用户的吞吐量性能进行了数值仿真。结果表明,所提PQTL-CSS能够在业务随机性较强的情况下,实现多种类型节点的动态、高效频谱共享,且中继协作节点的时延比传统方法要低。
[Abstract]:With the rapid growth of wireless communication demand. The contradiction between the scarcity of spectrum resources and the low overall spectrum efficiency caused by the actual fixed spectrum allocation mechanism has become a bottleneck restricting the rapid development of mobile communications in the future. Cognitive Radio. The CRT technology can actively perceive the wireless communication environment and dynamically access the idle frequency band not used by the primary user. It opens up a new way to solve these contradictions. The dynamic and complexity of spectrum resources bring challenges to the design and implementation of CR system. In this paper, a two-level cooperative spectrum sharing scheme based on priority queue (PQTL-CSS) is proposed. Cognitive users are recruited as relays. Assist to complete the authorized communication and extend the traditional data collaboration to management collaboration. The cooperative cognitive node coordinates the access of other cognitive nodes. A two-level central management structure consisting of primary users and cooperative cognitive nodes is formed, which ensures the highest priority of primary users and provides a return for the cognitive nodes to assist in the transmission of authorized services. The proposed mechanism can solve the problem of resource allocation between cooperative cognitive nodes and non-cooperative cognitive nodes. And the dynamic and efficient spectrum sharing of many kinds of nodes is realized under the condition of strong randomness of service. The protocol studies the data transmission of different types of users in cooperative cognitive wireless networks. An access protocol based on request permission difference is proposed. Considering the influence of the network topology and the dynamic characteristics of the communication process on the system, the primary user can periodically initiate the relay selection process to detect the channel, and can update the cognitive relay nodes according to the network conditions. In this way, when the network topology and communication process changes, the update of cooperative cognitive users can ensure better data transmission performance. Next, the proposed protocol is applied to cognitive tactical networks. The protocol is modified according to the characteristics of the network. The delay performance of different types of users is analyzed theoretically and numerically simulated in this paper. Numerical simulation of throughput performance of different types of users is carried out. The results show that the proposed PQTL-CSS can realize the dynamic performance of various types of nodes under the condition of strong randomness of service. Efficient spectrum sharing and delay of relay cooperative nodes are lower than traditional methods.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN925

【共引文献】