认知无线电论文基于OFDM的认知无线电频谱共享技术研究.docVIP

认知无线电论文：基于OFDM的认知无线电频谱共享技术研究 【中文摘要】当前,无线频谱资源的紧缺是限制无线通信与服务应用持续发展的瓶颈。认知无线电 Cognitive Radio,CR 作为一种新兴的技术,它改变了传统的由政府授权使用无线电频谱的方式,它以频谱利用的高效性为目标,允许非授权用户机会式利用授权用户的频谱空洞传输,被认为是解决无线频谱资源紧缺问题的一种新方法。而正交频分复用 OFDM 技术灵活的选频方案为实现认知无线电系统提供了良好的平台。针对基于OFDM的认知无线电系统,本文通过理论分析和算法仿真,着重于系统框架的设计以及基于OFDM的认知无线电系统的频谱共享模型和用户资源分配等关键技术的研究。研究了单认知无线电场景中的最优功率分配算法、贪婪算法,以及对贪婪算法的改进算法。并在单认知用户分配算法的基础上,研究了多用户频谱分配算法,其中包括多用户注水算法和比例公平的改进算法。 【英文摘要】Currently, the radio spectrum resource shortage which limits the application of wireless communications and services is the bottleneck of sustainable development. As a new technology, Cognitive Radio CR has changed the traditional use of radio spectrum authorized by the government in the past, considered the efficient spectrum utilization as its target, and allowed non-authorized users transmission by using the spectrum of authorized user, which is the new method to solve the problem of radio spectrum shortage. However, the flexible selecting frequency programs of orthogonal frequency division multiplexing OFDM technology provides a good platform for achieving cognitive radio systems.For OFDM-based cognitive radio system, this algorithm through theoretical analysis and simulation, focuses on the design of system framework and research of spectrum sharing model of cognitive radio systems based on OFDM, user resource allocation and other key technology.The thesis stated the optimum power allocation algorithm in the single cognitive radio scene, greedy algorithm, and its improved algorithm. Moreover, based on the single cognitive user allocation algorithm, the multi-user spectrum allocation algorithm which includes multi-user water-pouring and proportional fairness improved algorithm are researched. 【关键词】认知无线电 正交频分复用 子载波分配 干扰温度 【英文关键词】Cognitive Radio OFDM Subcarrier Allocation Interference Temperature 【目录】基于OFDM的认知无线电频谱共享技术研究 摘要 4-5 ABSTRACT 5 第一章 绪论 7-13 1.1 引言 7-8 1.2 认知无线电的研究历程 8-9 1.3 认知无线电的定义 9-11 1.4 本文的主要研究内容和结构安排 11-13 第二章 认知无线电的频谱共享技术 13-20 2.1 认知无线电的频谱共享 13-