面向CR-NOMA的动态频谱共享模型与分配算法研究

Dynamic Spectrum Sharing Model and Allocation Algorithm for CR-NOMA

认知无线电具备感知频谱环境和伺机灵活接入频谱能力,能够支撑不同无线电系统之间的频谱资源动态共享,提高频谱利用效率和解决制约无线通信可持续发展的频谱资源稀缺问题。认知无线电与非正交多址接入技术结合的认知非正交多址接入技术,支持认知用户通过正交、非正交方式在域内和域外进行频谱共享,极大地提高了频谱接入和频谱共享的灵活性。针对认知非正交多址接入技术提供的灵活频谱接入能力及其充分利用频谱资源的需求,提出基于网络化频谱地图数据库的动态频谱管理模型;从需要解决的两个关键性问题(即频谱资源分配和信道间干扰问题)入手,分析关于用户分组、功率分配及联合优化等问题的频谱分配算法,并进行对比仿真分析,展望更加高效的动态频谱共享模型与关键算法。

Cognitive radio,with the ability to perceive the spectrum environment and access the spectrum flexibly,can support the dynamic sharing of spectrum resources of between different radio systems,improve the efficiency of spectrum utilization and solve the problem of spectrum resource scarcity that restricts the sustainable development of wireless communication.Cognitive radio-inspired non-orthogonal multiple access supports cognitive users to share spectrum within and outside the domain through orthogonal and non-orthogonal methods,thus greatly improving the flexibility of spectrum access and spectrum sharing.A dynamic spectrum management model based on networked spectrum map database is proposed for the flexible spectrum access capability provided by cognitive non-orthogonal multiple access technology and the need to make full use of spectrum resources.Starting from the two key issues that need to be solved(i.e.spectrum resource allocation and inter-channel interference),spectrum allocation algorithms for user grouping,power allocation and joint optimization are analyzed,comparative simulation and analysis also done,thus looking forward to more efficient dynamic spectrum sharing models and key algorithms.